The Research On Double Color Image Watermark Algorithm Based On DWT And HVS

Along with the popularization of digital product, about the problem of digital product copyright protection and the security, a new technical of digital product copyright protection is proposed-Digital Watermark.The article has conducted certain research about double color image watermark inserting algorithm based on DWT and the HVS and digital copyright system based on the digital watermark technology.At first, as the research foundation, the article has collected massive materials about the digital watermark technology, from the materials, the article analyses the development origin of digital watermark technology. system model, evaluation index, classification, the attach methods and the countermeasures, the inserting capacity and the watermark examination method and so on. And introduced simply the theories about digital watermark research, like the public key encryption theory, the image encrypt randomly of technical, Hadamard transform, knowledge of HVS and so on. On grasping digital watermark system technical characteristic premise, analyzed and summarized the traditional watermark algorithm and the mentality, prepared for the next step to design concrete algorithm.Second, according to the watermark algorithm design mentality of transformation territory, from the angle of spread spectrum technology theory, proposed a color image double colored watermark algorithm based on DWT and HVS. According to wavelet coefficient high and low frequency distribution characteristic of primitive color image, statistics primitive color image wavelet piece energy and texture size, using the characteristic of human vision system to set inserting coefficient, inserts the mixed R, G and B component of colored watermark separately to R, G and B component of color image.Third, for the copyright authentication, proposed a double digital watermark algorithm which unified obviously and unobvious methods, through getting the elimination key of copyright owner, the digital product end-user can realization digital image blind extraction restore , simultaneously the copyright owner could prove own copyright according to the private watermark withdraw from the digital product using his own private key, the article have initially realized the digital image copyright protection and transaction. And based on the above watermark algorithm proposed a simple digital watermark copyright transaction system model. Finally, summarized myself findings and forecasted the further development of digital watermark.