Description: With the rapid development of computer network, happened to turn the world upside down change, the protection of digital information has been a brook no delay problem, due to the modification of digital content is very easy to copy, distribute, digital content on the Internet, there are a lot of piracy, infringement, protection of intellectual property rights, to resist all kinds of tort, in recent years has been is a new information security technology, digital watermarking technology, it is a kind of digital information technology for specific works of digital document right to protect the interests of the. Watermarking algorithm now popular at home and abroad is mainly based on spatial domain and transform domain, from the comparison of comprehensive performance, the transform domain approach is more superior, currently occupies the main position, future trends in the transform domain method for the mainstream. This paper presents a discrete cosine transform (DCT) color image waterm
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