DCPNet: a dual-channel parallel deep neural network for high quality computer-generated holography

PLUTO / PLUTO-2 Spatial Light Modulators
AR/VR/MR / Holographic Display Complex Modulation Deep Learning / Neuronal Network Digital-/ Computer Holography/ CGH
Published on:
Authors: Qingwei Liu, Jing Chen, Bingsen Qiu, Yongtian Wang, and Juan Liu
Abstract:

Recent studies have demonstrated that a learning-based computer-generated hologram (CGH) has great potential for real-time, high-quality holographic displays. However, most existing algorithms treat the complex-valued wave field as a two-channel spatial domain image to facilitate mapping onto real-valued kernels, which does not fully consider the computational characteristics of complex amplitude. To address this issue, we proposed a dual-channel parallel neural network (DCPNet) for generating phase-only holograms (POHs), taking inspiration from the double phase amplitude encoding method. Instead of encoding the complex-valued wave field in the SLM plane as a two-channel image, we encode it into two real-valued phase elements. Then the two learned sub-POHs are sampled by the complementary 2D binary grating to synthesize the desired POH. Simulation and optical experiments are carried out to verify the feasibility and effectiveness of the proposed method. The simulation results indicate that the DCPNet is capable of generating high-fidelity 2k POHs in 36 ms. The optical experiments reveal that the DCPNet has excellent ability to preserve finer details, suppress speckle noise and improve uniformity in the reconstructed images.

Open Access

Publication: Optics Express
Issue/Year: Opt. Express 31, 35908-35921 (2023)
DOI: 10.1364/OE.502503
Link: https://doi.org/10.1364/OE.502503

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