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Lamon S, de Dumast P, Sanchez T, Dunet V, Pomar L, Vial Y, Koob M, Bach Cuadra M. Assessment of fetal corpus callosum biometry by 3D super-resolution reconstructed T2-weighted magnetic resonance imaging. Front Neurol 2024; 15:1358741. [PMID: 38595845 PMCID: PMC11002102 DOI: 10.3389/fneur.2024.1358741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 03/08/2024] [Indexed: 04/11/2024] Open
Abstract
Objective To assess the accuracy of corpus callosum (CC) biometry, including sub-segments, using 3D super-resolution fetal brain MRI (SR) compared to 2D or 3D ultrasound (US) and clinical low-resolution T2-weighted MRI (T2WS). Method Fetal brain biometry was conducted by two observers on 57 subjects [21-35 weeks of gestational age (GA)], including 11 cases of partial CC agenesis. Measures were performed by a junior observer (obs1) on US, T2WS and SR and by a senior neuroradiologist (obs2) on T2WS and SR. CC biometric regression with GA was established. Statistical analysis assessed agreement within and between modalities and observers. Results This study shows robust SR to US concordance across gestation, surpassing T2WS. In obs1, SR aligns with US, except for genu and CC length (CCL), enhancing splenium visibility. In obs2, SR closely corresponds to US, differing in rostrum and CCL. The anterior CC (rostrum and genu) exhibits higher variability. SR's regression aligns better with literature (US) for CCL, splenium and body than T2WS. SR is the method with the least missing values. Conclusion SR yields CC biometry akin to US (excluding anterior CC). Thanks to superior 3D visualization and better through plane spatial resolution, SR allows to perform CC biometry more frequently than T2WS.
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Affiliation(s)
- Samuel Lamon
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland
- Ultrasound and Fetal Medicine, Department Woman-Mother-Child, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Priscille de Dumast
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland
| | - Thomas Sanchez
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland
| | - Vincent Dunet
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Léo Pomar
- Ultrasound and Fetal Medicine, Department Woman-Mother-Child, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
- School of Health Sciences (HESAV), University of Applied Sciences and Arts Western Switzerland, Lausanne, Switzerland
| | - Yvan Vial
- Ultrasound and Fetal Medicine, Department Woman-Mother-Child, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland
| | - Mériam Koob
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Meritxell Bach Cuadra
- Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland
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Jong LJS, Appelman JGC, Sterenborg HJCM, Ruers TJM, Dashtbozorg B. Spatial and Spectral Reconstruction of Breast Lumpectomy Hyperspectral Images. Sensors (Basel) 2024; 24:1567. [PMID: 38475103 DOI: 10.3390/s24051567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/23/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024]
Abstract
(1) Background: Hyperspectral imaging has emerged as a promising margin assessment technique for breast-conserving surgery. However, to be implicated intraoperatively, it should be both fast and capable of yielding high-quality images to provide accurate guidance and decision-making throughout the surgery. As there exists a trade-off between image quality and data acquisition time, higher resolution images come at the cost of longer acquisition times and vice versa. (2) Methods: Therefore, in this study, we introduce a deep learning spatial-spectral reconstruction framework to obtain a high-resolution hyperspectral image from a low-resolution hyperspectral image combined with a high-resolution RGB image as input. (3) Results: Using the framework, we demonstrate the ability to perform a fast data acquisition during surgery while maintaining a high image quality, even in complex scenarios where challenges arise, such as blur due to motion artifacts, dead pixels on the camera sensor, noise from the sensor's reduced sensitivity at spectral extremities, and specular reflections caused by smooth surface areas of the tissue. (4) Conclusion: This gives the opportunity to facilitate an accurate margin assessment through intraoperative hyperspectral imaging.
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Affiliation(s)
- Lynn-Jade S Jong
- Image-Guided Surgery, Department of Surgery, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
- Department of Nanobiophysics, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
| | - Jelmer G C Appelman
- Image-Guided Surgery, Department of Surgery, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
- Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1111, 1081 HV Amsterdam, The Netherlands
| | - Henricus J C M Sterenborg
- Image-Guided Surgery, Department of Surgery, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Theo J M Ruers
- Image-Guided Surgery, Department of Surgery, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
- Department of Nanobiophysics, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
| | - Behdad Dashtbozorg
- Image-Guided Surgery, Department of Surgery, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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Mufti N, Chappell J, Aertsen M, Ebner M, Fidon L, Deprest J, David AL, Melbourne A. Assessment of longitudinal brain development using super-resolution magnetic resonance imaging following fetal surgery for open spina bifida. Ultrasound Obstet Gynecol 2023; 62:707-720. [PMID: 37161647 PMCID: PMC10947002 DOI: 10.1002/uog.26244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 04/18/2023] [Accepted: 05/01/2023] [Indexed: 05/11/2023]
Abstract
OBJECTIVES Prenatal surgery is offered for selected fetuses with open spina bifida (OSB) to improve long-term outcome. We studied the effect of fetal OSB surgery on brain development using advanced magnetic resonance imaging (MRI) techniques to quantify the volume, surface area and shape of cerebral structures and to analyze surface curvature by means of parameters that correspond to gyrification. METHODS We compared MRI data from 29 fetuses with OSB before fetal surgery (mean gestational age (GA), 23 + 3 weeks) and at 1 and 6 weeks after surgery, with that of 36 GA-matched control fetuses (GA range, 21 + 2 to 36 + 2 weeks). Automated super-resolution reconstruction provided three-dimensional isotropic volumetric brain images. Unmyelinated white matter, cerebellum and ventricles were segmented automatically and refined manually, after which volume, surface area and shape parameter (volume/surface area) were quantified. Mathematical markers (shape index (SI) and curvedness) were used to measure gyrification. Parameters were assessed according to lesion type (myelomeningocele vs myeloschisis (MS)), postoperative persistence of hindbrain herniation (HH) and the presence of supratentorial anomalies, namely partial agenesis of the corpus callosum (pACC) and heterotopia (HT). RESULTS Growth in ventricular volume per week and change in shape parameter per week were higher at 6 weeks after surgery in fetuses with OSB compared with controls (median, 2500.94 (interquartile range (IQR), 1689.70-3580.80) mm3 /week vs 708.21 (IQR, 474.50-925.00) mm3 /week; P < 0.001 and 0.075 (IQR, 0.047-0.112) mm/week vs 0.022 (IQR, 0.009-0.042) mm/week; P = 0.046, respectively). Ventricular volume growth increased 6 weeks after surgery in cases with pACC (P < 0.001) and those with persistent HH (P = 0.002). During that time period, the change in unmyelinated white-matter shape parameter per week was decreased in OSB fetuses compared with controls (0.056 (IQR, 0.044-0.092) mm/week vs 0.159 (IQR, 0.100-0.247) mm/week; P = 0.002), particularly in cases with persistent HH (P = 0.011), MS (P = 0.015), HT (P = 0.022), HT with corpus callosum anomaly (P = 0.017) and persistent HH with corpus callosum anomaly (P = 0.007). At 6 weeks postoperatively, despite OSB fetuses having a lower rate of change in curvedness compared with controls (0.061 (IQR, 0.040-0.093) mm-1 /week vs 0.094 (IQR, 0.070-0.146) mm-1 /week; P < 0.001), reversing the trend seen at 1 week after surgery (0.144 (IQR, 0.099-0.236) mm-1 /week vs 0.072 (IQR, 0.059-0.081) mm-1 /week; P < 0.001), gyrification, as determined using SI, appeared to be increased in OSB fetuses overall compared with controls. This observation was more prominent in fetuses with pACC and those with severe ventriculomegaly (P-value range, < 0.001 to 0.006). CONCLUSIONS Following fetal OSB repair, volume, shape and curvedness of ventricles and unmyelinated white matter differed significantly compared with those of normal fetuses. Morphological brain changes after fetal surgery were not limited to effects on the circulation of cerebrospinal fluid. These observations may have implications for postnatal neurocognitive outcome. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- N. Mufti
- Elizabeth Garrett Anderson Institute for Women's HealthUniversity College LondonLondonUK
- School of Biomedical Engineering and Imaging Sciences (BMEIS)King's College LondonLondonUK
| | - J. Chappell
- School of Biomedical Engineering and Imaging Sciences (BMEIS)King's College LondonLondonUK
| | - M. Aertsen
- Department of RadiologyUniversity Hospitals Katholieke Universiteit (KU) LeuvenLeuvenBelgium
| | - M. Ebner
- School of Biomedical Engineering and Imaging Sciences (BMEIS)King's College LondonLondonUK
| | - L. Fidon
- School of Biomedical Engineering and Imaging Sciences (BMEIS)King's College LondonLondonUK
| | - J. Deprest
- Elizabeth Garrett Anderson Institute for Women's HealthUniversity College LondonLondonUK
- Department of Obstetrics and GynaecologyUniversity Hospitals Katholieke Universiteit (KU) LeuvenLeuvenBelgium
| | - A. L. David
- Elizabeth Garrett Anderson Institute for Women's HealthUniversity College LondonLondonUK
- Department of Obstetrics and GynaecologyUniversity Hospitals Katholieke Universiteit (KU) LeuvenLeuvenBelgium
- National Institute for Health and Care Research University College London Hospitals Biomedical Research CentreLondonUK
| | - A. Melbourne
- School of Biomedical Engineering and Imaging Sciences (BMEIS)King's College LondonLondonUK
- Medical Physics and Biomedical EngineeringUniversity College LondonLondonUK
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Jiang Y, Liu Y, Zhan W, Zhu D. Improved Thermal Infrared Image Super-Resolution Reconstruction Method Base on Multimodal Sensor Fusion. Entropy (Basel) 2023; 25:914. [PMID: 37372258 DOI: 10.3390/e25060914] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 06/01/2023] [Accepted: 06/07/2023] [Indexed: 06/29/2023]
Abstract
When traditional super-resolution reconstruction methods are applied to infrared thermal images, they often ignore the problem of poor image quality caused by the imaging mechanism, which makes it difficult to obtain high-quality reconstruction results even with the training of simulated degraded inverse processes. To address these issues, we proposed a thermal infrared image super-resolution reconstruction method based on multimodal sensor fusion, aiming to enhance the resolution of thermal infrared images and rely on multimodal sensor information to reconstruct high-frequency details in the images, thereby overcoming the limitations of imaging mechanisms. First, we designed a novel super-resolution reconstruction network, which consisted of primary feature encoding, super-resolution reconstruction, and high-frequency detail fusion subnetwork, to enhance the resolution of thermal infrared images and rely on multimodal sensor information to reconstruct high-frequency details in the images, thereby overcoming limitations of imaging mechanisms. We designed hierarchical dilated distillation modules and a cross-attention transformation module to extract and transmit image features, enhancing the network's ability to express complex patterns. Then, we proposed a hybrid loss function to guide the network in extracting salient features from thermal infrared images and reference images while maintaining accurate thermal information. Finally, we proposed a learning strategy to ensure the high-quality super-resolution reconstruction performance of the network, even in the absence of reference images. Extensive experimental results show that the proposed method exhibits superior reconstruction image quality compared to other contrastive methods, demonstrating its effectiveness.
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Affiliation(s)
- Yichun Jiang
- The College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China
- National Demonstration Center for Experimental Electrical, Changchun University of Science and Technology, Changchun 130022, China
| | - Yunqing Liu
- The College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Weida Zhan
- The College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China
- National Demonstration Center for Experimental Electrical, Changchun University of Science and Technology, Changchun 130022, China
| | - Depeng Zhu
- The College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China
- National Demonstration Center for Experimental Electrical, Changchun University of Science and Technology, Changchun 130022, China
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Li W, He D, Liu Y, Wang F, Huang F. Super-resolution reconstruction, recognition, and evaluation of laser confocal images of hyperaccumulator Solanum nigrum endocytosis vesicles based on deep learning: Comparative study of SRGAN and SRResNet. Front Plant Sci 2023; 14:1146485. [PMID: 37025152 PMCID: PMC10070864 DOI: 10.3389/fpls.2023.1146485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/09/2023] [Indexed: 06/19/2023]
Abstract
It is difficult for laser scanning confocal microscopy to obtain high- or ultra-high-resolution laser confocal images directly, which affects the deep mining and use of the embedded information in laser confocal images and forms a technical bottleneck in the in-depth exploration of the microscopic physiological and biochemical processes of plants. The super-resolution reconstruction model (SRGAN), which is based on a generative adversarial network and super-resolution reconstruction model (SRResNet), which is based on a residual network, was used to obtain single and secondary super-resolution reconstruction images of laser confocal images of the root cells of the hyperaccumulator Solanum nigrum. Using the peak signal-to-noise ratio (PSNR), structural similarity (SSIM) and mean opinion score (MOS), the models were evaluated by the image effects after reconstruction and were applied to the recognition of endocytic vesicles in Solanum nigrum root cells. The results showed that the single reconstruction and the secondary reconstruction of SRGAN and SRResNet improved the resolution of laser confocal images. PSNR, SSIM, and MOS were clearly improved, with a maximum PSNR of 47.690. The maximum increment of PSNR and SSIM of the secondary reconstruction images reached 21.7% and 2.8%, respectively, and the objective evaluation of the image quality was good. However, overall MOS was less than that of the single reconstruction, the perceptual quality was weakened, and the time cost was more than 130 times greater. The reconstruction effect of SRResNet was better than that of SRGAN. When SRGAN and SRResNet were used for the recognition of endocytic vesicles in Solanum nigrum root cells, the clarity of the reconstructed images was obviously improved, the boundary of the endocytic vesicles was clearer, and the number of identified endocytic vesicles increased from 6 to 9 and 10, respectively, and the mean fluorescence intensity was enhanced by 14.4% and 7.8%, respectively. Relevant research and achievements are of great significance for promoting the application of deep learning methods and image super-resolution reconstruction technology in laser confocal image studies.
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Affiliation(s)
- Wenhao Li
- School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China
| | - Ding He
- Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Environment, Nanjing Normal University, Nanjing, China
| | - Yongqiang Liu
- Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Environment, Nanjing Normal University, Nanjing, China
| | - Fenghe Wang
- Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Environment, Nanjing Normal University, Nanjing, China
| | - Fengliang Huang
- School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China
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Guo H, Wang L, Gu Y, Zhang J, Zhu Y. Semi-supervised super-resolution of diffusion-weighted images based on multiple references. NMR Biomed 2023:e4919. [PMID: 36908072 DOI: 10.1002/nbm.4919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Spatial resolution of diffusion tensor images is usually compromised to accelerate the acquisitions, and the state-of-the-art (SOTA) image super-resolution (SR) reconstruction methods are commonly based on supervised learning models. Considering that matched low-resolution (LR) and high-resolution (HR) diffusion-weighted (DW) image pairs are not readily available, we propose a semi-supervised DW image SR reconstruction method based on multiple references (MRSR) extracted from other subjects. In MRSR, the prior information of multiple HR reference images is migrated into a residual-like network to assist SR reconstruction of DW images, and a CycleGAN-based semi-supervised strategy is used to train the network with 30% matched and 70% unmatched LR-HR image pairs. We evaluate the performance of the MRSR by comparing against SOTA methods on an HCP dataset in terms of the quality of reconstructed DW images and diffusion metrics. MRSR achieves the best performance, with the mean PSNR/SSIM of DW images being improved by at least 14.3%/28.8% and 1%/1.4% respectively relative to SOTA unsupervised and supervised learning methods, and with the fiber orientations deviating from the ground truth by about 6.28° on average, the RMSEs of fractional anisotropy, mean diffusivity, axial diffusivity and radial diffusivity being 3.0%, 4.6%, 5.7% and 4.5% respectively relative to the ground truth. We validate the effectiveness of the proposed network structure, multiple-reference and CycleGAN-based semi-supervised learning strategies for SR reconstruction of diffusion tensor images through the ablation studies. The proposed method allows us to achieve SR reconstruction for diffusion tensor images with a limited number of matched image pairs.
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Affiliation(s)
- Haotian Guo
- Medical College, Key Laboratory of Intelligent Medical Image Analysis and Precise Diagnosis of Guizhou Province, College of Computer Science and Technology, State Key Laboratory of Public Big Data, Guizhou University, Guiyang, China
| | - Lihui Wang
- Medical College, Key Laboratory of Intelligent Medical Image Analysis and Precise Diagnosis of Guizhou Province, College of Computer Science and Technology, State Key Laboratory of Public Big Data, Guizhou University, Guiyang, China
| | - Yulong Gu
- Medical College, Key Laboratory of Intelligent Medical Image Analysis and Precise Diagnosis of Guizhou Province, College of Computer Science and Technology, State Key Laboratory of Public Big Data, Guizhou University, Guiyang, China
| | - Jian Zhang
- Medical College, Key Laboratory of Intelligent Medical Image Analysis and Precise Diagnosis of Guizhou Province, College of Computer Science and Technology, State Key Laboratory of Public Big Data, Guizhou University, Guiyang, China
| | - Yuemin Zhu
- Univ. Lyon, INSA Lyon, CNRS, Inserm, CREATIS UMR 5220, U1206, F-69621, Lyon, France
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Han J, Liu Y, Li Z, Liu Y, Zhan B. Safety Helmet Detection Based on YOLOv5 Driven by Super-Resolution Reconstruction. Sensors (Basel) 2023; 23:1822. [PMID: 36850419 PMCID: PMC9962800 DOI: 10.3390/s23041822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/03/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
High-resolution image transmission is required in safety helmet detection problems in the construction industry, which makes it difficult for existing image detection methods to achieve high-speed detection. To overcome this problem, a novel super-resolution (SR) reconstruction module is designed to improve the resolution of images before the detection module. In the super-resolution reconstruction module, the multichannel attention mechanism module is used to improve the breadth of feature capture. Furthermore, a novel CSP (Cross Stage Partial) module of YOLO (You Only Look Once) v5 is presented to reduce information loss and gradient confusion. Experiments are performed to validate the proposed algorithm. The PSNR (peak signal-to-noise ratio) of the proposed module is 29.420, and the SSIM (structural similarity) reaches 0.855. These results show that the proposed model works well for safety helmet detection in construction industries.
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Affiliation(s)
- Ju Han
- China Construction First Group Construction & Development Co., Ltd., Beijing 100102, China
| | - Yicheng Liu
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Zhipeng Li
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Yan Liu
- College of Electrical Engineering, Sichuan University, Chengdu 610065, China
| | - Bixiong Zhan
- China Construction First Group Construction & Development Co., Ltd., Beijing 100102, China
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Gui C, Wang D, Huang X, Wu C, Chen X, Huang H. Super-Resolution and Wide-Field-of-View Imaging Based on Large-Angle Deflection with Risley Prisms. Sensors (Basel) 2023; 23:1793. [PMID: 36850391 PMCID: PMC9961014 DOI: 10.3390/s23041793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 02/02/2023] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
A novel single camera combined with Risley prisms is proposed to achieve a super-resolution (SR) imaging and field-of-view extension (FOV) imaging method. We develop a mathematical model to consider the imaging aberrations caused by large-angle beam deflection and propose an SR reconstruction scheme that uses a beam backtracking method for image correction combined with a sub-pixel shift alignment technique. For the FOV extension, we provide a new scheme for the scanning position path of the Risley prisms and the number of image acquisitions, which improves the acquisition efficiency and reduces the complexity of image stitching. Simulation results show that the method can increase the image resolution to the diffraction limit of the optical system for imaging systems where the resolution is limited by the pixel size. Experimental results and analytical verification yield that the resolution of the image can be improved by a factor of 2.5, and the FOV extended by a factor of 3 at a reconstruction factor of 5. The FOV extension is in general agreement with the simulation results. Risley prisms can provide a more general, low-cost, and efficient method for SR reconstruction, FOV expansion, central concave imaging, and various scanning imaging.
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Affiliation(s)
- Chao Gui
- Key Laboratory of Testing Technology for Manufacturing Process, School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Detian Wang
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
| | - Xiwang Huang
- Key Laboratory of Testing Technology for Manufacturing Process, School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Chunyan Wu
- School of Computer Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Xin Chen
- Key Laboratory of Testing Technology for Manufacturing Process, School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Huachuan Huang
- Key Laboratory of Testing Technology for Manufacturing Process, School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
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Wu Z, Zhang T, Fang C, Yang J, Ma C, Zheng H, Zhao H. Super-resolution fusion optimization for poultry detection: a multi-object chicken detection method. J Anim Sci 2023; 101:skad249. [PMID: 37490419 PMCID: PMC10494879 DOI: 10.1093/jas/skad249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 07/24/2023] [Indexed: 07/27/2023] Open
Abstract
Accurate poultry detection is crucial for studying poultry behavior using computer vision and video surveillance. However, in free-range farming environments, detecting chickens can often be challenging due to their small size and mutual occlusion. The current detection algorithms exhibit a low level of accuracy, with a high probability of false and missed detections. To address this, we proposed a multi-object chicken detection method named Super-resolution Chicken Detection, which utilizes super-resolution fusion optimization. The algorithm employs the residual-residual dense block to extract image features and used a generative adversarial network to compensate for the loss of details during deep convolution, producing high-resolution images for detection. The proposed algorithm was validated with the B1 data set and the MC1 multi-object data set, demonstrating that the reconstructed images possessed richer pixel features compared to original images, specifically it improved detection accuracy and reduced the number of missed detections. The structural similarity of the reconstructed images was 99.9%, and the peak signal-to-noise ratio was above 30. The algorithm improved the Average Precision50:95 of all You Only Look Once Version X (YOLOX) models, with the largest improvement for the B1 data set with YOLOX-Large (+6.3%) and for the MC1 data set with YOLOX-Small (+4.1%). This was the first time a super-resolution reconstruction technique was applied to multi-object poultry detection. Our method will provide a fresh approach for future poultry researchers to improve the accuracy of object detection using computer vision and video surveillance.
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Affiliation(s)
- Zhenlong Wu
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
| | - Tiemin Zhang
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
- State Key Laboratory of Swine and Poultry Breeding Industry, Guangzhou 510642, PR China
- National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, PR China
| | - Cheng Fang
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
| | - Jikang Yang
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
| | - Chuang Ma
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
| | - Haikun Zheng
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
| | - Hongzhi Zhao
- College of Engineering, South China Agricultural University, Guangzhou 510642, PR China
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Chen Q, Bai H, Che B, Zhao T, Zhang C, Wang K, Bai J, Zhao W. Super-Resolution Reconstruction of Cytoskeleton Image Based on A-Net Deep Learning Network. Micromachines (Basel) 2022; 13:1515. [PMID: 36144138 PMCID: PMC9501965 DOI: 10.3390/mi13091515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/29/2022] [Accepted: 09/03/2022] [Indexed: 06/16/2023]
Abstract
To date, live-cell imaging at the nanometer scale remains challenging. Even though super-resolution microscopy methods have enabled visualization of sub-cellular structures below the optical resolution limit, the spatial resolution is still far from enough for the structural reconstruction of biomolecules in vivo (i.e., ~24 nm thickness of microtubule fiber). In this study, a deep learning network named A-net was developed and shows that the resolution of cytoskeleton images captured by a confocal microscope can be significantly improved by combining the A-net deep learning network with the DWDC algorithm based on a degradation model. Utilizing the DWDC algorithm to construct new datasets and taking advantage of A-net neural network's features (i.e., considerably fewer layers and relatively small dataset), the noise and flocculent structures which originally interfere with the cellular structure in the raw image are significantly removed, with the spatial resolution improved by a factor of 10. The investigation shows a universal approach for exacting structural details of biomolecules, cells and organs from low-resolution images.
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Affiliation(s)
- Qian Chen
- School of Automation, Northwestern Polytechnical University, Xi’an 710129, China
| | - Haoxin Bai
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
| | - Bingchen Che
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
| | - Tianyun Zhao
- School of Automation, Northwestern Polytechnical University, Xi’an 710129, China
| | - Ce Zhang
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
| | - Kaige Wang
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
| | - Jintao Bai
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
| | - Wei Zhao
- State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, Northwestern University, Xi’an 710127, China
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11
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C Thomas D, Oros-Peusquens AM, Poot D, Shah NJ. Whole-Brain Water Content Mapping Using Super-Resolution Reconstruction with MRI Acquisition in 3 Orthogonal Orientations. Magn Reson Med 2022; 88:2117-2130. [PMID: 35861258 DOI: 10.1002/mrm.29377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 06/13/2022] [Accepted: 06/13/2022] [Indexed: 11/11/2022]
Abstract
PURPOSE Brain water content provides rich tissue contrast comparable to that of longitudinal relaxation time T1 , but mapping is usually performed at modest resolution. In particular, the slice thickness in 2D mapping methods is limited. Here, we combine super-resolution reconstruction techniques with a fast water content mapping method to acquire high and isotropic resolution (0.75 mm) water content maps at 3 Tesla. METHODS A high-resolution multi-echo gradient echo image is super-resolution-reconstructed from 3 low-resolution, orthogonal multi-echo gradient echo image acquisitions, followed by water content mapping. The mapping accuracy and SNR of the proposed method are assessed using numerical simulations, phantom studies, and in vivo data acquired from 6 healthy volunteers at 3 Tesla. A high-resolution acquisition with an established mapping method is used as a reference. RESULTS Whole-brain water content maps with 0.75 mm isotropic resolution are demonstrated. No bias in the water content values was seen following super-resolution reconstruction. In the in vivo experiments, a lower SD of the mean water content values was observed with the proposed method compared to the reference method. CONCLUSIONS Super-resolution reconstruction of multi-echo gradient echo data is demonstrated, enabling whole-brain water content mapping with high and isotropic resolution. The accuracy of the proposed method is shown using phantoms and 6 healthy volunteers and was found to be unchanged compared to the conventional acquisition. The proposed method could increase the sensitivity of water content mapping sufficiently to enable the detection of very small lesions, such as cortical lesions in multiple sclerosis.
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Affiliation(s)
- Dennis C Thomas
- Institute of Neuroscience and Medicine 4, Jülich, Germany.,Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | | | - Dirk Poot
- Department of Radiology and Nuclear medicine, Erasmus Medical Centre, Rotterdam, The Netherlands
| | - N Jon Shah
- Institute of Neuroscience and Medicine 4, Jülich, Germany.,Institute of Neuroscience and Medicine 11, INM-11, JARA, Jülich, Germany.,JARA - BRAIN - Translational Medicine, Aachen, Germany.,Department of Neurology, RWTH Aachen University, Aachen, Germany
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12
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Zhou X, Jiang L, Hu C, Lei S, Zhang T, Mou X. YOLO-SASE: An Improved YOLO Algorithm for the Small Targets Detection in Complex Backgrounds. Sensors (Basel) 2022; 22:s22124600. [PMID: 35746382 PMCID: PMC9228422 DOI: 10.3390/s22124600] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/14/2022] [Accepted: 06/15/2022] [Indexed: 02/04/2023]
Abstract
To improve the detection ability of infrared small targets in complex backgrounds, an improved detection algorithm YOLO-SASE is proposed in this paper. The algorithm is based on the YOLO detection framework and SRGAN network, taking super-resolution reconstructed images as input, combined with the SASE module, SPP module, and multi-level receptive field structure while adjusting the number of detection output layers through exploring feature weight to improve feature utilization efficiency. Compared with the original model, the accuracy and recall rate of the algorithm proposed in this paper were improved by 2% and 3%, respectively, in the experiment, and the stability of the results was significantly improved in the training process.
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Affiliation(s)
- Xiao Zhou
- School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China; (X.Z.); (L.J.); (S.L.); (T.Z.)
| | - Lang Jiang
- School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China; (X.Z.); (L.J.); (S.L.); (T.Z.)
| | - Caixia Hu
- Beijing Aerospace Automatic Control Institute, Beijing 100000, China;
| | - Shuai Lei
- School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China; (X.Z.); (L.J.); (S.L.); (T.Z.)
| | - Tingting Zhang
- School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China; (X.Z.); (L.J.); (S.L.); (T.Z.)
| | - Xingang Mou
- School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China; (X.Z.); (L.J.); (S.L.); (T.Z.)
- Correspondence: ; Tel.: +86-180-7175-9713
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13
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Ma L, Rathgeb A, Mubarak H, Tran M, Fei B. Unsupervised super-resolution reconstruction of hyperspectral histology images for whole-slide imaging. J Biomed Opt 2022; 27:056502. [PMID: 35578386 PMCID: PMC9110022 DOI: 10.1117/1.jbo.27.5.056502] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 04/28/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE Hyperspectral imaging (HSI) provides rich spectral information for improved histopathological cancer detection. However, acquiring high-resolution HSI data for whole-slide imaging (WSI) can be time-consuming and requires a huge amount of storage space. AIM WSI using a color camera can be achieved with fast speed, high image resolution, and excellent image quality due to the established techniques. We aim to develop an RGB-guided unsupervised hyperspectral super-resolution reconstruction method that is hypothesized to improve image quality while maintaining the spectral characteristics. APPROACH High-resolution hyperspectral images of 32 histologic slides were obtained via automated WSI. High-resolution RGB histology images were registered to the hyperspectral images for RGB guidance. An unsupervised super-resolution network was trained to take the downsampled low-resolution hyperspectral patches (LR-HSI) and high-resolution RGB patches (HR-RGB) as inputs to reconstruct high-resolution hyperspectral patches (HR-HSI). Then, an Inception-based network was trained with the HR-RGB, original HR-HSI, and generated HR-HSI, respectively, for whole-slide histopathological cancer detection. RESULTS Our super-resolution reconstruction network generated high-resolution hyperspectral images with well-maintained spectral characteristics and improved image quality. Image classification using the original hyperspectral data outperformed RGB because of the extra spectral information. The generated hyperspectral image patches further improved the results. CONCLUSIONS The proposed method potentially reduces image acquisition time, saves storage space without compromising image quality, and improves the image classification performance.
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Affiliation(s)
- Ling Ma
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
- Tianjin University, State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin, China
| | - Armand Rathgeb
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
| | - Hasan Mubarak
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
| | - Minh Tran
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
| | - Baowei Fei
- University of Texas at Dallas, Department of Bioengineering, Richardson, Texas, United States
- University of Texas at Dallas, Center for Imaging and Surgical Innovation, Richardson, Texas, United States
- University of Texas Southwestern Medical Center, Department of Radiology, Dallas, Texas, United States
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14
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Ren X, Jung JE, Zhu W, Lee SJ. Penalized-Likelihood PET Image Reconstruction Using Similarity-Driven Median Regularization. Tomography 2022; 8:158-174. [PMID: 35076630 PMCID: PMC8788485 DOI: 10.3390/tomography8010013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/24/2021] [Accepted: 01/02/2022] [Indexed: 11/16/2022] Open
Abstract
In this paper, we present a new regularized image reconstruction method for positron emission tomography (PET), where an adaptive weighted median regularizer is used in the context of a penalized-likelihood framework. The motivation of our work is to overcome the limitation of the conventional median regularizer, which has proven useful for tomographic reconstruction but suffers from the negative effect of removing fine details in the underlying image when the edges occupy less than half of the window elements. The crux of our method is inspired by the well-known non-local means denoising approach, which exploits the measure of similarity between the image patches for weighted smoothing. However, our method is different from the non-local means denoising approach in that the similarity measure between the patches is used for the median weights rather than for the smoothing weights. As the median weights, in this case, are spatially variant, they provide adaptive median regularization achieving high-quality reconstructions. The experimental results indicate that our similarity-driven median regularization method not only improves the reconstruction accuracy, but also has great potential for super-resolution reconstruction for PET.
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Affiliation(s)
- Xue Ren
- Department of Electronic Engineering, Pai Chai University, Daejeon 35345, Korea; (X.R.); (W.Z.)
| | - Ji Eun Jung
- Image Processing Group, Genoray, Company, Ltd., Seongnam 13230, Gyeonggi-Do, Korea;
| | - Wen Zhu
- Department of Electronic Engineering, Pai Chai University, Daejeon 35345, Korea; (X.R.); (W.Z.)
| | - Soo-Jin Lee
- Department of Electronic Engineering, Pai Chai University, Daejeon 35345, Korea; (X.R.); (W.Z.)
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15
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Mufti N, Ebner M, Patel P, Aertsen M, Gaunt T, Humphries PD, Bredaki FE, Hewitt R, Butler C, Sokolska M, Kendall GS, Atkinson D, Vercauteren T, Ourselin S, Pandya PP, Deprest J, Melbourne A, David AL. Super-resolution Reconstruction MRI Application in Fetal Neck Masses and Congenital High Airway Obstruction Syndrome. OTO Open 2021; 5:2473974X211055372. [PMID: 34723053 PMCID: PMC8549475 DOI: 10.1177/2473974x211055372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 10/06/2021] [Indexed: 11/21/2022] Open
Abstract
Objective Reliable airway patency diagnosis in fetal tracheolaryngeal obstruction is crucial to select and plan ex utero intrapartum treatment (EXIT) surgery. We compared the clinical utility of magnetic resonance imaging (MRI) super-resolution reconstruction (SRR) of the trachea, which can mitigate unpredictable fetal motion effects, with standard 2-dimensional (2D) MRI for airway patency diagnosis and assessment of fetal neck mass anatomy. Study Design A single-center case series of 7 consecutive singleton pregnancies with complex upper airway obstruction (2013-2019). Setting A tertiary fetal medicine unit performing EXIT surgery. Methods MRI SRR of the trachea was performed involving rigid motion correction of acquired 2D MRI slices combined with robust outlier detection to reconstruct an isotropic high-resolution volume. SRR, 2D MRI, and paired data were blindly assessed by 3 radiologists in 3 experimental rounds. Results Airway patency was correctly diagnosed in 4 of 7 cases (57%) with 2D MRI as compared with 2 of 7 cases (29%) with SRR alone or paired 2D MRI and SRR. Radiologists were more confident (P = .026) in airway patency diagnosis when using 2D MRI than SRR. Anatomic clarity was higher with SRR (P = .027) or paired data (P = .041) in comparison with 2D MRI alone. Radiologists detected further anatomic details by using paired images versus 2D MRI alone (P < .001). Cognitive load, as assessed by the NASA Task Load Index, was increased with paired or SRR data in comparison with 2D MRI. Conclusion The addition of SRR to 2D MRI does not increase fetal airway patency diagnostic accuracy but does provide improved anatomic information, which may benefit surgical planning of EXIT procedures.
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Affiliation(s)
- Nada Mufti
- Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK.,School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Michael Ebner
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.,Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
| | - Premal Patel
- Radiology Department, Great Ormond Street Hospital for Children, London, UK
| | - Michael Aertsen
- Department of Radiology, University Hospitals Katholieke Universiteit, Leuven, Belgium
| | - Trevor Gaunt
- Radiology Department, Great Ormond Street Hospital for Children, London, UK.,Women's Health Division, University College London Hospitals, London, UK
| | - Paul D Humphries
- Radiology Department, Great Ormond Street Hospital for Children, London, UK
| | | | - Richard Hewitt
- Ear, Nose and Throat Department, Great Ormond Street Hospital for Children, London, UK
| | - Colin Butler
- Ear, Nose and Throat Department, Great Ormond Street Hospital for Children, London, UK
| | - Magdalena Sokolska
- Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
| | - Giles S Kendall
- Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK.,Women's Health Division, University College London Hospitals, London, UK
| | - David Atkinson
- Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK.,Centre for Medical Imaging, University College London, London, UK
| | - Tom Vercauteren
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.,Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
| | - Sebastien Ourselin
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.,Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
| | - Pranav P Pandya
- Women's Health Division, University College London Hospitals, London, UK
| | - Jan Deprest
- Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK.,Department of Obstetrics and Gynaecology, University Hospitals Katholieke Universiteit, Leuven, Belgium
| | - Andrew Melbourne
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.,Department of Medical Physics and Biomedical Engineering, University College London Hospitals, London, UK
| | - Anna L David
- Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK.,Department of Obstetrics and Gynaecology, University Hospitals Katholieke Universiteit, Leuven, Belgium
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16
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吴 洋, 杨 丰, 黄 靖, 刘 娅. [Super-resolution construction of intravascular ultrasound images using generative adversarial networks]. Nan Fang Yi Ke Da Xue Xue Bao 2019; 39:82-87. [PMID: 30692071 PMCID: PMC6765585 DOI: 10.12122/j.issn.1673-4254.2019.01.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Indexed: 06/09/2023]
Abstract
The low-resolution ultrasound images have poor visual effects. Herein we propose a method for generating clearer intravascular ultrasound images based on super-resolution reconstruction combined with generative adversarial networks. We used the generative adversarial networks to generate the images by a generator and to estimate the authenticity of the images by a discriminator. Specifically, the low-resolution image was passed through the sub-pixel convolution layer r2-feature channels to generate r2-feature maps in the same size, followed by realignment of the corresponding pixels in each feature map into r ×r sub-blocks, which corresponded to the sub-block in a high-resolution image; after amplification, an image with a r2-time resolution was generated. The generative adversarial networks can obtain a clearer image through continuous optimization. We compared the method (SRGAN) with other methods including Bicubic, super-resolution convolutional network (SRCNN) and efficient sub-pixel convolutional network (ESPCN), and the proposed method resulted in obvious improvements in the peak signal-to-noise ratio (PSNR) by 2.369 dB and in structural similarity index by 1.79% to enhance the diagnostic visual effects of intravascular ultrasound images.
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Affiliation(s)
- 洋洋 吴
- />南方医科大学生物医学工程学院广东省医学图像处理重点实验室,广东 广州 510515Guangdong Provincial Key Laboratory of Medical Image Processing, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China
| | - 丰 杨
- />南方医科大学生物医学工程学院广东省医学图像处理重点实验室,广东 广州 510515Guangdong Provincial Key Laboratory of Medical Image Processing, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China
| | - 靖 黄
- />南方医科大学生物医学工程学院广东省医学图像处理重点实验室,广东 广州 510515Guangdong Provincial Key Laboratory of Medical Image Processing, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China
| | - 娅琴 刘
- />南方医科大学生物医学工程学院广东省医学图像处理重点实验室,广东 广州 510515Guangdong Provincial Key Laboratory of Medical Image Processing, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China
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17
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Zhang J, Zheng P, Tan X. Recognition of Broken Wire Rope Based on Remanence using EEMD and Wavelet Methods. Sensors (Basel) 2018; 18:s18041110. [PMID: 29621174 PMCID: PMC5948680 DOI: 10.3390/s18041110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/02/2018] [Accepted: 04/03/2018] [Indexed: 06/08/2023]
Abstract
The magnetic flux leakage method is widely used for non-destructive testing in wire rope applications. A non-destructive testing device for wire rope based on remanence was designed to solve the problems of large volume, low accuracy, and complex operations seen in traditional devices. A wavelet denoising method based on ensemble empirical mode decomposition was proposed to reduce the system noise in broken wire rope testing. After extracting the defects image, the wavelet super-resolution reconstruction technique was adopted to improve the resolution of defect grayscale. A back propagation neural network was designed to classify defects by the feature vectors of area, rectangle, stretch length, and seven invariant moments. The experimental results show that the device was not only highly precise and sensitive, but also easy to operate; noise is effectively suppressed by the proposed filtering algorithm, and broken wires are classified by the network.
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Affiliation(s)
- Juwei Zhang
- College of Electrical Engineering, Henan University of Science and Technology, Luoyang 471023, China.
- Power Electronics Device and System Engineering Laboratory of Henan, Henan University of Science and Technology, Luoyang 471023, China.
| | - Pengbo Zheng
- College of Electrical Engineering, Henan University of Science and Technology, Luoyang 471023, China.
- Power Electronics Device and System Engineering Laboratory of Henan, Henan University of Science and Technology, Luoyang 471023, China.
| | - Xiaojiang Tan
- College of Electrical Engineering, Henan University of Science and Technology, Luoyang 471023, China.
- Power Electronics Device and System Engineering Laboratory of Henan, Henan University of Science and Technology, Luoyang 471023, China.
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18
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Zhu H, Tang X, Xie J, Song W, Mo F, Gao X. Spatio-Temporal Super-Resolution Reconstruction of Remote-Sensing Images Based on Adaptive Multi-Scale Detail Enhancement. Sensors (Basel) 2018; 18:s18020498. [PMID: 29414893 PMCID: PMC5855159 DOI: 10.3390/s18020498] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 02/01/2018] [Accepted: 02/02/2018] [Indexed: 12/04/2022]
Abstract
There are many problems in existing reconstruction-based super-resolution algorithms, such as the lack of texture-feature representation and of high-frequency details. Multi-scale detail enhancement can produce more texture information and high-frequency information. Therefore, super-resolution reconstruction of remote-sensing images based on adaptive multi-scale detail enhancement (AMDE-SR) is proposed in this paper. First, the information entropy of each remote-sensing image is calculated, and the image with the maximum entropy value is regarded as the reference image. Subsequently, spatio-temporal remote-sensing images are processed using phase normalization, which is to reduce the time phase difference of image data and enhance the complementarity of information. The multi-scale image information is then decomposed using the L0 gradient minimization model, and the non-redundant information is processed by difference calculation and expanding non-redundant layers and the redundant layer by the iterative back-projection (IBP) technique. The different-scale non-redundant information is adaptive-weighted and fused using cross-entropy. Finally, a nonlinear texture-detail-enhancement function is built to improve the scope of small details, and the peak signal-to-noise ratio (PSNR) is used as an iterative constraint. Ultimately, high-resolution remote-sensing images with abundant texture information are obtained by iterative optimization. Real results show an average gain in entropy of up to 0.42 dB for an up-scaling of 2 and a significant promotion gain in enhancement measure evaluation for an up-scaling of 2. The experimental results show that the performance of the AMED-SR method is better than existing super-resolution reconstruction methods in terms of visual and accuracy improvements.
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Affiliation(s)
- Hong Zhu
- Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China.
- College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
| | - Xinming Tang
- Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China.
- Key Laboratory of Satellite Surveying and Mapping Technology and Application, NASG, Beijing 10048, China.
- School of Earth Science and Engineering, Hohai University, Nanjing 211100, China.
| | - Junfeng Xie
- Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China.
- Key Laboratory of Satellite Surveying and Mapping Technology and Application, NASG, Beijing 10048, China.
- School of Surveying and Geographical Science, Liaoning Technical University, Fuxin 123000, China.
| | - Weidong Song
- School of Surveying and Geographical Science, Liaoning Technical University, Fuxin 123000, China.
| | - Fan Mo
- Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China.
| | - Xiaoming Gao
- Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China.
- Key Laboratory of Satellite Surveying and Mapping Technology and Application, NASG, Beijing 10048, China.
- School of Surveying and Geographical Science, Liaoning Technical University, Fuxin 123000, China.
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Fang S, Zhong T, Chen J, Zhang Y. [ Super-resolution reconstruction for lung four dimensional computed tomography images using multi-model Gaussian process regression]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2017; 34:922-927. [PMID: 29761989 DOI: 10.7507/1001-5515.201704048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Lung four dimensional computed tomography (4D-CT) can lead to accurate radiotherapy. However, for the safety of patients, the scan spacing of 4D-CT cannot be too small so that the inter-slice resolution of lung 4D-CT is low, and thus the coronal and sagittal images need to be interpolated to obtain high-resolution images. This paper presents a super-resolution reconstruction technique based on multi-model Gaussian process regression. We use the high-resolution transversal images and the corresponding low-resolution images as the training sets. The high-resolution pixels of the coronal and sagittal images can be predicted by constructing multiple Gaussian process regression models. The experimental results show that our method is superior to bicubic algorithm, projections onto convex sets, sparse coding, multi-phase similarity based method and Gaussian process regression method based on self-learning block in terms of the edge and detail recovery. The results demonstrate that the proposed method can effectively improve the quality of lung 4D-CT images, and potentially be applied to better image-guided radiation therapy of lung cancer.
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Affiliation(s)
- Shiting Fang
- School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, P.R.China;Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University, Guangzhou 510515, P.R.China
| | - Tao Zhong
- School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, P.R.China;Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University, Guangzhou 510515, P.R.China
| | - Jin Chen
- School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, P.R.China;Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University, Guangzhou 510515, P.R.China
| | - Yu Zhang
- School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, P.R.China;Guangdong Provincial Key Laboratory of Medical Image Processing, Southern Medical University, Guangzhou 510515,
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20
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Fan C, Chen X, Zhong L, Zhou M, Shi Y, Duan Y. Improved Wallis Dodging Algorithm for Large-Scale Super-Resolution Reconstruction Remote Sensing Images. Sensors (Basel) 2017; 17:E623. [PMID: 28335482 DOI: 10.3390/s17030623] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 03/02/2017] [Accepted: 03/16/2017] [Indexed: 11/17/2022]
Abstract
A sub-block algorithm is usually applied in the super-resolution (SR) reconstruction of images because of limitations in computer memory. However, the sub-block SR images can hardly achieve a seamless image mosaicking because of the uneven distribution of brightness and contrast among these sub-blocks. An effectively improved weighted Wallis dodging algorithm is proposed, aiming at the characteristic that SR reconstructed images are gray images with the same size and overlapping region. This algorithm can achieve consistency of image brightness and contrast. Meanwhile, a weighted adjustment sequence is presented to avoid the spatial propagation and accumulation of errors and the loss of image information caused by excessive computation. A seam line elimination method can share the partial dislocation in the seam line to the entire overlapping region with a smooth transition effect. Subsequently, the improved method is employed to remove the uneven illumination for 900 SR reconstructed images of ZY-3. Then, the overlapping image mosaic method is adopted to accomplish a seamless image mosaic based on the optimal seam line.
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21
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Mahmoudzadeh AP, Kashou NH. Interpolation-based super-resolution reconstruction: effects of slice thickness. J Med Imaging (Bellingham) 2014; 1:034007. [PMID: 26158065 DOI: 10.1117/1.jmi.1.3.034007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2014] [Accepted: 11/18/2014] [Indexed: 11/14/2022] Open
Abstract
Standard clinical magnetic resonance imaging (MRI) is acquired in two-dimensions where the in-plane resolution is higher than the slice select direction. These acquisitions include axial, coronal, and sagittal planes. To date, there have been few attempts to combine the information of these three orthogonal orientations. This paper aims to take advantage of the different in-plane resolution acquired from each plane orientation and combine them into one volume in order to attain a higher resolution image. This combination of MRI data will allow the detection of smaller areas that would otherwise be missed using only one slice orientation. A comparison of slice thicknesses along with image registration is performed. The mean-squared error and peak signal-to-noise were computed for quantitative assessment. MRI and phantom scans and joint histograms were used for qualitative assessment.
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Affiliation(s)
- Amir Pasha Mahmoudzadeh
- University of California , San Francisco, Radiology and Biomedical Imaging, San Francisco, California 94143, United States
| | - Nasser H Kashou
- Wright State University , Biomedical Imaging Laboratory, Dayton, Ohio 45435, United States
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Dzyubachyk O, Tao Q, Poot DHJ, Lamb HJ, Zeppenfeld K, Lelieveldt BPF, van der Geest RJ. Super-resolution reconstruction of late gadolinium-enhanced MRI for improved myocardial scar assessment. J Magn Reson Imaging 2014; 42:160-7. [PMID: 25236764 DOI: 10.1002/jmri.24759] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 08/29/2014] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To develop and validate a method for improving image resolution of late gadolinium-enhanced (LGE) magnetic resonance imaging (MRI) for accurate assessment of myocardial scar. MATERIALS AND METHODS In a cohort of 37 postinfarction patients, LGE was performed prior to ventricular tachycardia catheter ablation therapy at 1.5T. A super-resolution reconstruction (SRR) technique was applied to the three anisotropic views: short-axis (SA), two-chamber, and four-chamber, to reconstruct a single isotropic volume. For compensation of the interscan heart motion, a joint localized gradient-correlation-based scheme was developed. Scar was identified as either core or gray zone in both the SRR and original SA volumes, and evaluated based on the clinically established bipolar voltage range of the in vivo electroanatomical voltage mapping (EAVM). RESULTS Compared to the SA volume, the SRR method resulted in significantly (P < 0.05) reduced myocardial scar gray zone sizes (10.5 ± 8.8 g vs. 9.2 ± 8.1 g) and improved agreement of the bipolar voltage range of scar gray zone (0.99 ± 0.65 mV vs. 1.46 ± 1.15 mV). CONCLUSION We propose an SRR method to automatically reconstruct a high-quality isotropic LGE volume from three orthogonal views. Analysis of the in vivo EAVM demonstrated improved myocardial scar assessment from the SRR volume compared with the SA LGE alone.
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Affiliation(s)
- Oleh Dzyubachyk
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Qian Tao
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Dirk H J Poot
- Departments of Radiology and Medical Informatics, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Katja Zeppenfeld
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Boudewijn P F Lelieveldt
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.,Intelligent Systems Department, Delft University of Technology, Delft, The Netherlands
| | - Rob J van der Geest
- Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
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23
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Poole DS, Plenge E, Poot DHJ, Lakke EAJF, Niessen WJ, Meijering E, van der Weerd L. Three-dimensional inversion recovery manganese-enhanced MRI of mouse brain using super-resolution reconstruction to visualize nuclei involved in higher brain function. NMR Biomed 2014; 27:749-759. [PMID: 24817644 DOI: 10.1002/nbm.3108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Revised: 03/10/2014] [Accepted: 03/11/2014] [Indexed: 06/03/2023]
Abstract
The visualization of activity in mouse brain using inversion recovery spin echo (IR-SE) manganese-enhanced MRI (MEMRI) provides unique contrast, but suffers from poor resolution in the slice-encoding direction. Super-resolution reconstruction (SRR) is a resolution-enhancing post-processing technique in which multiple low-resolution slice stacks are combined into a single volume of high isotropic resolution using computational methods. In this study, we investigated, first, whether SRR can improve the three-dimensional resolution of IR-SE MEMRI in the slice selection direction, whilst maintaining or improving the contrast-to-noise ratio of the two-dimensional slice stacks. Second, the contrast-to-noise ratio of SRR IR-SE MEMRI was compared with a conventional three-dimensional gradient echo (GE) acquisition. Quantitative experiments were performed on a phantom containing compartments of various manganese concentrations. The results showed that, with comparable scan times, the signal-to-noise ratio of three-dimensional GE acquisition is higher than that of SRR IR-SE MEMRI. However, the contrast-to-noise ratio between different compartments can be superior with SRR IR-SE MEMRI, depending on the chosen inversion time. In vivo experiments were performed in mice receiving manganese using an implanted osmotic pump. The results showed that SRR works well as a resolution-enhancing technique in IR-SE MEMRI experiments. In addition, the SRR image also shows a number of brain structures that are more clearly discernible from the surrounding tissues than in three-dimensional GE acquisition, including a number of nuclei with specific higher brain functions, such as memory, stress, anxiety and reward behavior.
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Affiliation(s)
- Dana S Poole
- C. J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
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24
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Lee J, Woo J, Xing F, Murano EZ, Stone M, Prince JL. SEMI-AUTOMATIC SEGMENTATION OF THE TONGUE FOR 3D MOTION ANALYSIS WITH DYNAMIC MRI. Proc IEEE Int Symp Biomed Imaging 2013; 2013:1465-1468. [PMID: 24443699 DOI: 10.1109/isbi.2013.6556811] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Accurate segmentation is an important preprocessing step for measuring the internal deformation of the tongue during speech and swallowing using 3D dynamic MRI. In an MRI stack, manual segmentation of every 2D slice and time frame is time-consuming due to the large number of volumes captured over the entire task cycle. In this paper, we propose a semi-automatic segmentation workflow for processing 3D dynamic MRI of the tongue. The steps comprise seeding a few slices, seed propagation by deformable registration, random walker segmentation of the temporal stack of images and 3D super-resolution volumes. This method was validated on the tongue of two subjects carrying out the same speech task with multi-slice 2D dynamic cine-MR images obtained at three orthogonal orientations and 26 time frames. The resulting semi-automatic segmentations of 52 volumes showed an average dice similarity coefficient (DSC) score of 0.9 with reduced segmented volume variability compared to manual segmentations.
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Affiliation(s)
- Junghoon Lee
- Department of Radiation Oncology, Johns Hopkins University, Baltimore, MD, USA ; Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Jonghye Woo
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA ; Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, USA
| | - Fangxu Xing
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Emi Z Murano
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Maureen Stone
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, USA
| | - Jerry L Prince
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA
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Hu MG, Wang JF, Ge Y. Super-resolution reconstruction of remote sensing images using multifractal analysis. Sensors (Basel) 2009; 9:8669-83. [PMID: 22291530 PMCID: PMC3260607 DOI: 10.3390/s91108669] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 10/10/2009] [Accepted: 10/21/2009] [Indexed: 12/04/2022]
Abstract
Satellite remote sensing (RS) is an important contributor to Earth observation, providing various kinds of imagery every day, but low spatial resolution remains a critical bottleneck in a lot of applications, restricting higher spatial resolution analysis (e.g., intra-urban). In this study, a multifractal-based super-resolution reconstruction method is proposed to alleviate this problem. The multifractal characteristic is common in Nature. The self-similarity or self-affinity presented in the image is useful to estimate details at larger and smaller scales than the original. We first look for the presence of multifractal characteristics in the images. Then we estimate parameters of the information transfer function and noise of the low resolution image. Finally, a noise-free, spatial resolution-enhanced image is generated by a fractal coding-based denoising and downscaling method. The empirical case shows that the reconstructed super-resolution image performs well in detail enhancement. This method is not only useful for remote sensing in investigating Earth, but also for other images with multifractal characteristics.
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Affiliation(s)
- Mao-Gui Hu
- Institute of Geographic Sciences & Nature Resources Research, Chinese Academy of Sciences, Beijing, China; E-Mails: (M.H.); (Y.G.)
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