The Application Of Digital Watermark Technology In Image Anti-counterfeiting

With the development of Internet technology, the global economy has been rapidly rising.as well as the proliferation of digital works copyright infringement. So the protection of digital products become extremely necessary. In order to solve the problem, people proposed a technology for the protection of intellectual property rights with the help of image processing technology. And named it "digital watermark".The current digital watermarking technology is mainly used in grayscale image. In this paper, the digital watermarking technology is used for anti-counterfeiting treatment of color images. The specific work is as follows:(1) Analyze the evolution process of ridgelet transform to curvelet transform, study the implement method and characteristic of curvelet transform . and propose a curve-changing watermarking algorithm for gray image. First, the algorithm perform Arnold scrambling process on binary digital watermark image, then transforms the curve. Next, embeds it into the curve?coefficients with the same resolution in the carrier gray image. Fourth, the inverse transform is carried out, Finally the binary watermark image embeds grayscale images. The result shows that this algorithm has good concealment and can resist the interference of normal noise, JPEG compression, rotation and shear, and has good robustness.(2) For the color image, the RGB color channels are used to represent the color of the image. Each color channel has its corresponding watermark embedding intensity. According to the different watermark embedding intensity ratio, it shows that when R: G: B = 2: 1:4. the robustness and concealment achieve the best balance. Then, a color component of the watermark is embedded in another color channel of the carrier image.The result showe that the G component of the watermark is embedded in the B channel of the carrier image,and the B component of the watermark is embedded in the G channel of the carrier image ,it will improve the concealment of watermark.(3) Combining this algorithm with the color image RGB channel, this paper proposes a digital watermarking technique for color image .Firstly,this technology performs RGB color separation on the color carrier image and the watermark. then performs Arnold scrambling on each watermark component. which improves the algorithm security Next .it respectively embeds the R component?the B component and the G component information of the watermark iinto the carrier image the R channel, the G channel and the B channel, and finally performs color synthesis on the carrier image of the watermark information for different channels to complete the color watermark embedding in the color carrier image. After the watermark is embedded, the test shows that the algorithm has better concealment and it has good robustness in the process of resisting noise. JPEG compression and shear attack. While. the resistance to rotation needed to be improved.