Viewing window expansion of integral floating display

Analysis on image expressible region of integral floating

We define the image expressible region where three-dimensional (3D) images can be reconstructed in an integral floating display using ray distribution information. Here, the image expressible and viewing regions of the integral floating system, defined using ray distribution based on ray optics, are analyzed to resolve an image-cropping problem known as the viewing window that is due to the virtual aperture. Two experiments for verifying the image expressible and viewing regions are performed, and the results are presented. The obtained analysis is useful to maximize the viewing properties of integral floating.

Depth extraction by using the correlation of the periodic function with an elemental image in integral imaging

We propose a depth extraction method by using the correlation between an elemental image and a periodic function in computational integral imaging. Because each elemental image corresponds to a different perspective of the three-dimensional (3-D) object, an elemental image is regarded as the sum of the periodic spatial frequencies depending on the depth of a 3-D object. In this regard, we analyze the property of correlation between the same periodic functions and vice versa. To show the feasibility of the proposed method, we carried out our experiment and presented the results.

Three-dimensional display technologies of recent interest: principles, status, and issues [Invited]

Recent trends in three-dimensional (3D) display technologies are very interesting in that both old-fashioned and up-to-date technologies are being actively investigated together. The release of the first commercially successful 3D display product raised new research topics in stereoscopic display. Autostereoscopic display renders a ray field of a 3D image, whereas holography replicates a wave field of it. Many investigations have been conducted on the next candidates for commercial products to resolve existing limitations. Up-to-date see-through 3D display is a concept close to the ultimate goal of presenting seamless virtual images. Although it is still far from practical use, many efforts have been made to resolve issues such as occlusion problems.

Frequency domain depth filtering of integral imaging

A novel technique for depth filtering of integral imaging is proposed. Integral imaging captures spatio-angular distribution of the light rays which delivers three-dimensional information of the object scene. The proposed method performs filtering operation in the frequency domain of the captured spatio-angular light ray distribution, achieving depth selective reconstruction. Grating projection further enhances the depth discrimination performance. The principle is verified experimentally.

Recent progress in three-dimensional information processing based on integral imaging

Recently developed integral imaging techniques are reviewed. Integral imaging captures and reproduces the light rays from the object space, enabling the acquisition and the display of the three-dimensional information of the object in an efficient way. Continuous effort on integral imaging has been improving the performance of the capture and display process in various aspects, including distortion, resolution, viewing angle, and depth range. Digital data processing of the captured light rays can now visualize the three-dimensional structure of the object with a high degree of freedom and enhanced quality. This recent progress is of high interest for both industrial applications and academic research.

Resolution-enhanced reconstruction of far 3-D objects by using a direct pixel mapping method in computational curving-effective integral imaging

In this paper, we propose a novel approach for resolution-enhanced computational reconstruction of far 3-D objects by employing a direct pixel mapping (DPM) method in the curving-effective integral imaging (CEII) system. In this method, by using the DPM method, an elemental image array (EIA) picked up from a far 3-D object can be computationally transformed into a new EIA, which virtually looks like the EIA picked up from a near object. Therefore, with this newly transformed EIA a much better resolution-enhanced object image can be reconstructed in the CEII system. Good experimental results confirmed the feasibility of the proposed method.