三维纯相位全息显示中的散斑噪声抑制 
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Speckle Noise Suppression in Three-Dimensional Phase-Only Holographic Display
安徽工程大学电气工程学院, 安徽 芜湖 241000
图 & 表
图 1. 仿真结果一。(a)原图;(b)直接去除振幅的纯相位全息图再现像;(c)基于角谱理论改进的GS算法的纯相位全息图再现像;(d)所提方法的纯相位全息图再现像;(e)直接去除振幅的相位全息图;(f)基于角谱理论改进的GS算法的相位全息图;(g)所提方法的相位全息图
Fig. 1. Simulation results I. (a) Original image; (b)reconstructed image of phase-only hologram after direct removal of magnitude; (c)reconstructed image of phase-only hologram by modified GS algorithm based on angular-spectral theory; (d) reconstructed image of phase-only hologram by proposed algorithm ; (e) phase hologram after direct removal of magnitude; (f) phase hologram of modified GS algorithm based on angular-spectral theory; (g) phase hologram by proposed algorithm
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图 2. 三维小火车。(a)深度图;(b)位置图
Fig. 2. Three-dimensional little train: (a) Depth map; (b) position map
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图 3. 仿真结果二。(a)直接去除振幅的相位全息图;(b)直接去除振幅的相位分布图;(c)经误差扩散处理的相位全息图;(d)经误差扩散处理的相位分布图;直接去除振幅的距离为(e) 210,(f) 220,(g) 230 mm的纯相位全息图再现像;经误差扩散处理的距离为(h) 210,(i) 220,(j) 230 mm的纯相位全息图再现像
Fig. 3. Simulation results II. (a) Phase hologram after direct removal of magnitude; (b) phase profile after direct removal of magnitude; (c) phase hologram after error diffusion processing; (d) phase profile after error diffusion processing; reconstructed images of phase-only hologram after direct removal of magnitude but for different distances of (e) 210, (f) 220 and (g) 230 mm, respectively; reconstructed images of phase-only hologram after error diffusion processing but for different distances of (
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表 1不同算法下全息再现像的SI比较
Table1. SI comparison of reconstructed images for different algorithms
| Image | SI |
|---|
| Original image | 0.016 | | Image derived from direct removal of magnitude component | 0.842 | | Image derived from modified GS algorithm based on angular-spectrum theory | 0.577 | | Image derived from proposed algorithm | 0.419 |
|
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表 2两种方法的运行时间比较
Table2. Comparison of running time for two algorithms
| Image | Running time /s |
|---|
| Image by modified GS algorithm based on angular-spectrum theory | 2.648 | | Image by proposed algorithm | 0.887 |
|
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表 3处理前后SI的比较
Table3. SI comparison before and after processing
| Image | Distance | SI |
|---|
| Original image | | 0.095 | | Reconstructed image after direct removal of magnitude | d1=210 mm | 1.065 | | Reconstructed image by proposed algorithm | d1=210 mm | 0.983 | | Reconstructed image after direct removal of magnitude | d2=220 mm | 1.071 | | Reconstructed image by proposed algorithm | d2=220 mm | 1.005 | | Reconstructed image after direct removal of magnitude | d3=230 mm | 1.058 | | Reconstructed image by proposed algorithm | d3=230 mm | 0.991 |
|
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周婷婷, 韩超. 三维纯相位全息显示中的散斑噪声抑制[J]. 中国激光, 2018, 45(12): 1209001. Tingting Zhou, Chao Han. Speckle Noise Suppression in Three-Dimensional Phase-Only Holographic Display[J]. Chinese Journal of Lasers, 2018, 45(12): 1209001.
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