中文摘要：

基于数字图像处理技术，提出了一套对数字全息图及其再现像进行处理的方法，改善了数字全息图再现像的像质．利用频谱匹配滤波的方法可以有效地滤除零级及孪生像干扰．同时，提出了通过均值滤波、中值滤波等方法降低激光散斑噪音的技术．理论和实验证明，综合而又合理地利用数字图像处理技术可以很大程度地改善数字全息图再现像的像质．

英文摘要：

Based on image processing techniques, a set of methods to process a digital hologram and its reconstructed image is proposed, by which the quality of the reconstructed image can be further improved. The approach of matched frequency filtering is presented to eliminate the zero-order and twin image disturbances. In addition,the methods to reduce the speckle noise in the numerical reconstructed image are put forward including averaging filtering, low-pass filtering, Wiener filtering and Median filtering. An attractive idea of reducing the speckle noise can be constructed by merging the former approaches. The experimental results prove that the preceding approaches can really improve the quality of the reconstructed image to a great extent.