中文说明：用matlab实现的有一个数字水印程序，它也是基于dct算法的数字水印程序，对一副图像进行dct变换然后嵌入水印
English Description：
There is a digital watermarking program realized by MATLAB, which is also a digital watermarking program based on DCT algorithm. It transforms an image by DCT, and then embeds the watermark