Study On Digital Image Watermarking Algorithm And Application In Anti-forgery Technology

With the rapid growth of Internet technologies and extensive use of multimedia data, the enforcement of multimedia copyright protection becomes an important issue. Digital watermarking is viewed as an effective way for intellectual property right protection of multimedia data.This paper is focus on the digital image watermarking system and its application in the anti-forgery technology.At first, this paper briefly introduced the basic features of digital watermarking, then discussed several common watermarking algorithms and their relative merits. Further, a self-adapted blind watermarking algorithm based on Fuzzy Clustering (FC) and Discrete Wavelet Transform (DWT) is proposed. It first transform the original image using the DWT, then use the FC to classify the original image, then embed watermarks of different intensity according to the characteristics of Human Visual System (HVS) adaptively. Then, many tests on this algorithm are implemented. It is proved that this algorithm can insert watermark of maximum intensity, and is robust to common attacks. And the watermarking can be extracted without the original image, so it is very practical. Later, an improved single-detect multi-watermarking asymmetric algorithm is proposed on the grounds of the testing results and further studies, which will enhance the property of the algorithm introduced before.The study of digital watermarking algorithm is still a hot topic. The algorithm proposed in this paper does well in solving the conflict between the robustness and invisibility of watermark as well as the shortcoming of symmetric watermarking system, so it has good performance in surviving common attack and excellent application value.