Dr. Hui Li Profile

Dr. Hui Li

at Beijing Univ. of Posts and Telecommunications

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Publications (2)

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Proceedings Article | 27 November 2023 Paper

Optimized real-time complex-amplitude holographic display based on computer-generated holograms

Xinzhu Sang, Hui Li, Chongli Zhong

Proceedings Volume 12768, 127680K (2023) https://doi.org/10.1117/12.2688608

KEYWORDS: Computer generated holography, Spatial light modulators, Holographic displays, Complex amplitude, Wavefronts, Image quality, 3D image reconstruction, 3D displays, Image processing

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Optimized method of complex-amplitude holographic display and computer-generated holograms (CGHs) based on complex-valued convolutional neural network are presented. The wavefront frequency decomposition is carried out on the object light wave to generate two frequency images. The low frequency image is determined by amplitude CGH loaded with an amplitude spatial light modulator (SLM). The high frequency image is decided by phase CGH loaded with a phase SLM. The mentioned two sub-holograms are reconstructed and integrated at the identical location, and the amplitude and phase information are enhanced. Complex-valued convolutional neural network (CCNN) is used for real-time CGH generation. Complex-valued convolutional and ReLU layers are combined in CCNN, which is designed based on the feature of complex amplitude. Instead of processing amplitude and phase respectively, CCNN processes the complex amplitude directly. CCNN-CGH architecture can generate 1920×1072 and 3840×2160 resolution CGH with an average PSNR of more than 30dB in real-time. The speckle noise in display images is reduced, which gives the credit to the reconstruction of complex-amplitude modulation. The experimental results show that the method simultaneously enables high image quality and efficient calculation to be provided, which is more suitable for the real time 3D display. The quality of reconstructed images can be noticeably improved.

Proceedings Article | 19 December 2022 Poster + Paper

Real-time interactive computer-generated hologram using Fresnel zone plate extension method

Zhi Sun, Xinzhu Sang, Chongli Zhong, Hui Li, Xiujuan Qin, Rui Xiao, Yu Dong

Proceedings Volume 12318, 123182C (2022) https://doi.org/10.1117/12.2643663

KEYWORDS: Computer generated holography, Holograms, Ray tracing, Wavefronts, Diffraction, Holography, Parallel computing

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Holographic display can reconstruct the optical wave field of three-dimensional (3D) scenes. Computer- generated hologram (CGH) can simulate the optical transmission process from the 3D object to the hologram plane and avoid complicated experiments. Wavefront recording plane (WRP) is a fast algorithm for CGH, which is placed between the 3D object and the CGH. However, the computational amount is increased when the depth range of the 3D object is expanded. In this paper, we propose a fast calculation algorithm for real-time interactive CGH using a novel Fresnel zone plate (FZP) extension method and ray tracing. In the first step, ray tracing is used to get the amplitude value and the depth value of each object point. The maximum resolution of each FZP is determined according to the distance from the object point to the WRP. In the second step, a preset square portion of each FZP is used to calculate the complex amplitude of the WRP. Then diffraction calculation is performed from the WRP to the hologram plane for calculating CGH, and the computational domain of each FZP is gradually extended as the number of frames increases. The above calculation is repeated when interacting. The computational complexity is effectively reduced because the resolution of each FZP is increased until the maximum resolution is reached, instead of directly calculating each FZP with the maximum resolution. Experiments demonstrate the proposed method can generate CGH in real-time. The resolution of the hologram is 1024x024 and the CGH generation rate is 45.81 frames per second when interacting.

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