Digital Watermarking and its Application in Image Copyright Protection

Digital watermarking technology is a frontier research field, and it serves an important role in information security. According to the analysis of the definition and basic characteristics of digital watermarking technology, the system model of digital watermarking is given. The system consists of two modules which are watermark embedding module and watermark detection and extraction module. In view of the importance of digital images copyright protection, based on the analysis of the main digital watermarking algorithms, the digital watermarking technology can be applied to the image copyright protection. The two dimension discrete cosine transform is encoded on the Windows platform by using Visual C++ program language. The experiment result shows that the digital watermark is non-perceptible, the watermark information can be extracted even if it has been attacked, and the expected effect can be achieved.