When extracting the watermark, determine the extracting location in accordance with the key, extract the binary watermark and then recover the gray image watermark.
提取水印时，按照密钥确定水印提取位置，使用与嵌入互逆的方式提取二值水印，恢复为灰度水印。
A method of embedding a color digital watermark into a gray level image is proposed.
本文提出一种将彩色数字水印嵌入到灰度级图像中的方法。
Based on chaos theory, the gray image as watermark is encrypted.
基于混沌理论，对作为水印的灰度图像进行了加密的处理。
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