Today, the three-dimensional imaging technology change rapidly and develops in the various directions. The three-dimensional imaging techniques with no parallax are outstanding such as the composition using a half mirror, and the projection to semitransparent screen, in them. In this report, I review the perspective of the technique to perform three-dimensional imaging technology, using the picture which no parallax and point out that the viewpoint of the person of appreciation is important not a builder. In addition, I point out confusion occurring over 3D imaging technique and perform a proposal for the future development.
Various computer-generated holograms (CGH) have been studied to reconstruct complex and resolution images. We have investigated subjective image quality evaluation of CGH with the diffraction efficiency (DE) and peak signal-to-noise ratio (PSNR). The DE represents brightness of the reconstructed image and PSNR represents image reproducibility. Conducted a study about the image quality difference by calculation method. However, it is known that the PSNR does not always match with human perception. Therefore, in this study, we carried out an objective image quality evaluation using the structural similarity (SSIM) that enables evaluation closer to the subjective evaluation than PSNR. By using a non-linear transformation on the interference pattern of the Fourier transform hologram, it is shown that the DE can be enhanced with sacrifies of SSIM.
One of the best technique to create full-color high-definition CGHs is to utilize a color filer used for making color liquid crystal displays. In this paper, the actual problems for solution are discussed in order to realize full-color reconstruction using the color filter. Then, we report several techniques adopted to solve the problems and create full-color CGHs. In addition an actual full-color CGH composed of 16 billion pixels and its optical reconstruction are presented to verify the proposed techniques.
Full-parallax high-definition CGHs were mainly created by using the polygon-based method because of the computation time. In particular, high-definition CGHs fabricated by laser lithography have never been calculated by the point cloud. However, development of GPU makes the point cloud be useful for creating high-definition CGHs. In this paper, we actually calculate full-parallax high-definition CGHs with 4 billion pixels by using the point cloud with GPU and fabricate them. The computation time and the optical reconstruction are verified in comparison with the polygon-based method.
The fringe pattern of CGHs printed by laser lithography is formed by thin metal film such as chromium film. The fabricated CGH is a thin hologram but can be reconstructed as the reflection type hologram because of its high reflectivity. In this study, by using this technique, we attempt to create a full-color volume type CGH by stacking three transferred volume CGHs that reconstruct primary color 3D images.