中文说明：用matlab写的图像离散余弦变换域的水印嵌入与提取以及攻击测试代码，稍加修改就可以移植到自己的程序中，很有用哦
English Description：
Using MATLAB to write the image discrete cosine transform domain watermark embedding and extraction and attack test code, a little modification can be transplanted to their own procedures, very useful oh