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Pensia L, Kumar M, Kumar R. Dual Field-of-View Off-Axis Spatially Multiplexed Digital Holography Using Fresnel's Bi-Mirror. SENSORS (BASEL, SWITZERLAND) 2024; 24:731. [PMID: 38339448 PMCID: PMC10857002 DOI: 10.3390/s24030731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024]
Abstract
Digital holography (DH) is an important method for three-dimensional (3D) imaging since it allows for the recording and reconstruction of an object's amplitude and phase information. However, the field of view (FOV) of a DH system is typically restricted by the finite size of the pixel pitch of the digital image sensor. We proposed a new configuration of the DH system based on Fresnel's bi-mirror to achieve doubling the camera FOV of the existing off-axis DH system which leveraged single-shot acquisition and a common-path optical framework. The dual FOV was obtained by spatial frequency multiplexing corresponding to two different information-carrying beams from an object. Experimental evidence of the proposed dual FOV-DH system's viability was provided by imaging two different areas of the test object and an application to surface profilometry by measuring the step height of the resolution chart which showed excellent agreement with an optical profiler. Due to the simple configuration, the proposed system could find a wide range of applications, including in microscopy and optical metrology.
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Affiliation(s)
- Lavlesh Pensia
- CSIR—Central Scientific Instruments Organisation, Sector 30C, Chandigarh 160030, India;
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manoj Kumar
- Department of Systems Science, Graduate School of System Informatics, Kobe University, Kobe 657-8501, Japan
- Center of Optical Scattering Image Science, Kobe University, Kobe 657-8501, Japan
| | - Raj Kumar
- CSIR—Central Scientific Instruments Organisation, Sector 30C, Chandigarh 160030, India;
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Yu H, Kim Y, Yang D, Seo W, Kim Y, Hong JY, Song H, Sung G, Sung Y, Min SW, Lee HS. Deep learning-based incoherent holographic camera enabling acquisition of real-world holograms for holographic streaming system. Nat Commun 2023; 14:3534. [PMID: 37316495 DOI: 10.1038/s41467-023-39329-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/02/2023] [Indexed: 06/16/2023] Open
Abstract
While recent research has shown that holographic displays can represent photorealistic 3D holograms in real time, the difficulty in acquiring high-quality real-world holograms has limited the realization of holographic streaming systems. Incoherent holographic cameras, which record holograms under daylight conditions, are suitable candidates for real-world acquisition, as they prevent the safety issues associated with the use of lasers; however, these cameras are hindered by severe noise due to the optical imperfections of such systems. In this work, we develop a deep learning-based incoherent holographic camera system that can deliver visually enhanced holograms in real time. A neural network filters the noise in the captured holograms, maintaining a complex-valued hologram format throughout the whole process. Enabled by the computational efficiency of the proposed filtering strategy, we demonstrate a holographic streaming system integrating a holographic camera and holographic display, with the aim of developing the ultimate holographic ecosystem of the future.
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Affiliation(s)
- Hyeonseung Yu
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Youngrok Kim
- Department of Information Display, KyungHee University, 26, Kyungheedae-ro, Seoul, 02447, South Korea
| | - Daeho Yang
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
- Department of Physics, Gachon University, 1342 Seongnam-daero, Seongnam, Gyeonggi-do, 13120, South Korea
| | - Wontaek Seo
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Yunhee Kim
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Jong-Young Hong
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Hoon Song
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Geeyoung Sung
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Younghun Sung
- Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Suwon, 16678, Gyeonggi-do, South Korea
| | - Sung-Wook Min
- Department of Information Display, KyungHee University, 26, Kyungheedae-ro, Seoul, 02447, South Korea.
| | - Hong-Seok Lee
- Department of Electrical and Computer Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, South Korea.
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Nobukawa T, Katano Y, Goto M, Muroi T, Hagiwara K, Ishii N. Grating-based in-line geometric-phase-shifting incoherent digital holographic system toward 3D videography. OPTICS EXPRESS 2022; 30:27825-27840. [PMID: 36236944 DOI: 10.1364/oe.460187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 06/20/2022] [Indexed: 06/16/2023]
Abstract
Incoherent digital holography (IDH) with a sequential phase-shifting method enables high-definition 3D imaging under incoherent lights. However, sequential recording of multiple holograms renders IDH impractical for 3D videography. In this study, we propose grating-based in-line geometric-phase-shifting IDH. Our method divides orthogonal circularly polarized lights into four copies with a fabricated phase grating and subsequently creates self-interference holograms with geometric phases introduced by a segmented linear polarizer. This enables single-shot recording of holograms without the need for a specially designed image sensor, such as a polarization-sensitive sensor. Moreover, the achievable spatial resolution is higher than that of off-axis methods. As a proof-of-principle experiment, we demonstrated snapshot and video recording of 3D reflective objects using our IDH method. The results confirmed the feasibility of the proposed method.
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Nobukawa T, Maezawa M, Katano Y, Goto M, Muroi T, Hagiwara K, Ishii N. Transformation of coherence-dependent bokeh for incoherent digital holography. OPTICS LETTERS 2022; 47:2774-2777. [PMID: 35648927 DOI: 10.1364/ol.460108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Incoherent digital holography (IDH) enables the recording of holograms with incoherent light. However, there is unnatural bokeh with ringing on reconstructed 2D images, owing to the diffraction calculation based on the coherent nature of the light. Thus, we propose a transformation method that converts it into incoherent bokeh. This proposed method can generate 2D images without ringing from recorded holograms through a virtual incoherent imaging system, while focusing on the non-linearity problem of reconstruction distances in IDH. Flexible depth-of-field control is also made possible by the judicious selection of parameters in this method. A proof-of-principle demonstration verifies its feasibility.
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Nobukawa T, Katano Y, Goto M, Muroi T, Kinoshita N, Iguchi Y, Ishii N. Incoherent digital holography simulation based on scalar diffraction theory. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2021; 38:924-932. [PMID: 34263747 DOI: 10.1364/josaa.426579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 05/18/2021] [Indexed: 06/13/2023]
Abstract
Incoherent digital holography (IDH) enables passive 3D imaging through the self-interference of incoherent light. IDH imaging properties are dictated by the numerical aperture and optical layout in a complex manner [Opt. Express27, 33634 (2019)OPEXFF1094-408710.1364/OE.27.033634]. We develop an IDH simulation model to provide insight into its basic operation and imaging properties. The simulation is based on the scalar diffraction theory. Incoherent irradiance and self-interference holograms are numerically represented by the intensity-based summation of each propagation through finite aperture optics from independent point sources. By comparing numerical and experimental results, the applicability, accuracy, and limitation of the simulation are discussed. The developed simulation would be useful in optimizing the IDH setup.
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Nobukawa T, Katano Y, Goto M, Muroi T, Kinoshita N, Iguchi Y, Ishii N. Coherence aperture restricted spatial resolution for an arbitrary depth plane in incoherent digital holography. APPLIED OPTICS 2021; 60:5392-5398. [PMID: 34263778 DOI: 10.1364/ao.426583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 05/27/2021] [Indexed: 06/13/2023]
Abstract
Incoherent digital holography (IDH) requires no spatial coherence; however, it requires high temporal coherence for a light source to capture holograms with high spatial resolution. Temporal coherence is often enhanced with a bandpass filter, reducing the light utilization efficiency. Thus, there is a trade-off between spatial resolution and light utilization efficiency. In this paper, we derive a relationship between spatial resolution and temporal coherence by including a conceptual aperture, determined by temporal coherence, in our previous theory of spatial resolution for arbitrary depth planes [Opt. Express27, 33634 (2019)OPEXFF1094-408710.1364/OE.27.033634]. Experimental evaluations verified the effectiveness of our theory, which is useful for the optimization of IDH setups and avoiding the trade-off.
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Sakamaki S, Yoneda N, Nomura T. Single-shot in-line Fresnel incoherent holography using a dual-focus checkerboard lens. APPLIED OPTICS 2020; 59:6612-6618. [PMID: 32749362 DOI: 10.1364/ao.393176] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 07/05/2020] [Indexed: 06/11/2023]
Abstract
Fresnel incoherent correlation holography (FINCH) is a technology that can acquire three-dimensional information of incoherent objects such as fluorescence with an in-line optical system. However, it is difficult to apply FINCH to dynamic phenomena, since FINCH has to detect phase-shifted holograms sequentially to eliminate twin and zero-order images. In this paper, a method in which the phase-shifted holograms can be obtained simultaneously with an in-line setup by using an optimized simulated diffraction optical element (sDOE), realized by a phase-only spatial light modulator, is proposed. The optimized sDOE is an optical device with a dual-focus lens, 2D grating, and spatial phase shifter. Therefore, the sDOE is called a dual-focus checkerboard lens. The optical experiment confirms the feasibility of the proposed method.
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