Optimization and Efficient Computation of Mask Extension for Holographic Display Viewing Angle Method
This paper proposes an improvement method for addressing the low reconstructed-image quality and insufficient computational efficiency in three-dimensional hologram calculation for the random phase-mask-extension holographic-display viewing-angle method.The improvement includes two aspects:1)Introducing the calculation of band-limited angular spectrum diffraction into the Gerchberg-Saxton(GS)phase-iteration process to enhance the reconstructed-phase hologram quality after expanding the viewing angle using an additional random phase mask and effectively suppressing speckle noise in hologram-reconstruction results using the time-averaging method;2)optimizing the GS phase-iteration process by combining a lookup table design with a multi-compute unified device architecture(CUDA)stream parallel algorithm to significantly improve hologram-generation efficiency.Numerical-simulation results show that the introduction of band-limited angular spectrum diffraction into the GS algorithm combined with the time-averaging method yields higher imaging quality compared with the conventional GS algorithm combined with time-averaging method.Compared with the results of the conventional GS optimization,the proposed method reduces the speckle contrast from 0.41 to 0.2065,increases the peak signal-to-noise ratio(PSNR)from 10.6808 to 18.0546,and improves the structural similarity(SSIM)from 0.2778 to 0.7338 in the reconstructed results.Meanwhile,using the hierarchical hologram acceleration scheme designed in this study,the computation time for a single three-dimensional object hologram is reduced from 1410.53 s to 16.47 s,thus demonstrating the feasibility of the proposed method.
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