光学
全息术
斑点图案
散斑噪声
物理
图像分辨率
分辨率(逻辑)
对比度(视觉)
散斑成像
迭代重建
倾斜(摄像机)
计算机科学
数字全息术
人工智能
数学
几何学
作者
Yu Feng,Lei Zhu,Kai Wei,Yudong Zhang,Liangcai Cao
出处
期刊:Applied Optics
[Optica Publishing Group]
日期:2021-06-10
卷期号:60 (17): 5220-5220
摘要
Speckle can be attenuated by averaging the reconstructed images of each sub-hologram or being filtered with different filters, at the expense of resolution. We propose a de-speckling method for a single-shot digital hologram while maintaining the resolution. Different tip–tilt phases are demonstrated to cause changes only for the speckle distributions of the reconstructed image. The speckle is attenuated by averaging these intensity images with different speckle distributions. The normalized contrast can be reduced to 0.56 by averaging only 20 different reconstructed images. When the averaged image is processed with block matching and 3D filtering, a further de-speckled image at a normalized contrast of 0.46 can be obtained with highly preserved resolution.
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