用空间域掩模结合图像滤波提高全息图再现像空间分辨率

Improve spatial resolution by spatial domain mask and filtering in digital holography

为了提高全息图再现像的空间分辨率并降低散斑噪声,本文提出了空间域掩模结合滤波的算法。该算法用空间域掩模从单幅全息图中获取一定数量的子全息图,再用滤波器对这些子全息图再现像的均值图像进一步处理。通过一系列的实验,验证了本实验方法的有效性和可靠性。实验结果显示,该算法能提高全息图再现像的空间分辨率,同时降低散斑噪声。

A method using masks in spatial domain and filtering is proposed to improve the spatial resolution of the reconstructed image and decrease the speckle noise.In this paper,the amplitude masks is used in spatial domain to obtain a number of sub-holograms from a whole digital hologram,and filter is used to decrease the speckle noise in the averaged images reconstructed from these sub-holograms.Several experiments have been carried out to validate the effectiveness of the proposed method.Experimental results prove the feasibility and effectiveness for improving the spatial resolution and decreasing the speckle noise of the reconstructed image.