本文主要研究了灰度互相关匹配算法、基于一维投影的匹配算法、基于直方图不变矩的匹配算法，分析并比较了各算法的优缺点。
In this method, some techniques are analyzed and adopted such as correlation algorithm, algorithm based on projection and algorithm based on invariant moments of histogram.
首先对图像进行分块，分别提取每块图像的直方图不变矩，组合起来作为数字水印，然后利用奇异值分解的方法将这些水印嵌入到原图像中。
First we go on blocking to image an extract moment invariant of histogram from the blocking image and combine it as the digital watermarking.
它是基于图象分割前后矩保持不变的原理，利用图象的灰度级直方图自动地确定多个分割阈值，该算法简单、计算量小。
It is based on the principle that the moment remains unchanged before and after the segmentation. This algorithm features simplicity and less calculation requirement.
它是基于图象分割前后矩保持不变的原理，利用图象的灰度级直方图自动地确定多个分割阈值，该算法简单、计算量小。
It is based on the principle that the moment remains unchanged before and after the segmentation. This algorithm features simplicity and less calculation requirement.
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