AUTHOR=Zhao Yu , Huang Yuan , Zhu Li-Ming , Bu Jing-Wen , Du Yu-Ren , Zhu Ming-Yu , Zhu Jin-Rong TITLE=Segmented Point Cloud Gridding Method for a Full-Color Holographic System With Real Objects JOURNAL=Frontiers in Photonics VOLUME=3 YEAR=2022 URL=https://www.frontiersin.org/journals/photonics/articles/10.3389/fphot.2022.831267 DOI=10.3389/fphot.2022.831267 ISSN=2673-6853 ABSTRACT=

The large amount of computing data from hologram calculations incurs a heavy computational load for realistic full-color holographic displays. In this research, we propose a segmented point-cloud gridding (S-PCG) method to enhance the computing ability of a full-color holographic system. A depth camera is used to collect the color and depth information from actual scenes, which are then reconstructed into the point-cloud model. Object points are categorized into depth grids with identical depth values in the red, green, and blue (RGB) channels. In each channel, the depth grids are segmented into M×N parts, and only the effective area of the depth grids will be calculated. Computer-generated holograms (CGHs) are generated from efficient depth grids by using a fast Fourier transform (FFT). Compared to the wavefront recording plane (WRP) and traditional PCG methods, the computational complexity is dramatically reduced. The feasibility of the S-PCG approach is established through numerical simulations and optical reconstructions.