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

Xinzhu Sang; Hui Li; Chongli Zhong

doi:10.1117/12.2688608

27 November 2023 Optimized real-time complex-amplitude holographic display based on computer-generated holograms

Xinzhu Sang, Hui Li, Chongli Zhong

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127680K (2023) https://doi.org/10.1117/12.2688608
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

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.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xinzhu Sang, Hui Li, and Chongli Zhong "Optimized real-time complex-amplitude holographic display based on computer-generated holograms", Proc. SPIE 12768, Holography, Diffractive Optics, and Applications XIII, 127680K (27 November 2023); https://doi.org/10.1117/12.2688608

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KEYWORDS

Computer generated holography

Holographic displays

Spatial light modulators

Complex amplitude

Image quality

Wavefronts

3D displays

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