The influence of hologram aperture on speckle noise in the reconstructed image of digital holography and its reduction
The influence of hologram aperture on speckle noise in the reconstructed image of digital holography and its reduction
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DOI：
10.1016/j.optcom.2007.09.030
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发表时间：
2008-01
影响因子：
2.4
通讯作者：
Xiao-ou Cai;Hui Wang
中科院分区：
文献类型：
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作者：
Xiao-ou Cai;Hui Wang
从数字全息记录和再现的全过程出发，研究了再现像中散斑噪声的形成原因，得出了全息孔径衍射的小尺寸加剧了再现像散斑噪声的结论，散斑噪声已成为再现过程中的主要噪声源之一。为了减少全息图小孔径衍射引起的散斑噪声，我们设置了与全息图记录参数和孔径大小相匹配的孔径函数，并用它对再现像进行去卷积处理。理论和实验证明了该方法的有效性。从而为抑制数字全息再现像中的斑点噪声提供了一种全新的思路和实用的方法。
Based on the whole process of the recording and reconstruction of digital holography, we study the formation cause of speckle noise in its reconstructed image and acquire the conclusion that the small size of hologram aperture diffraction aggravates the speckle noise of reconstructed image and the speckle noise has been one of primary noise sources in the reconstruction process. In order to reduce the speckle noise resulting from little hologram aperture diffraction, we set an appropriate aperture function matching the recording parameter and aperture size of hologram and deconvolve the reconstructed image with it. The validity has been proved in theory and experiment. Therefore, it offers a brand-new thought and practical way to reduce the speckle noise in the reconstructed image of digital holography.