Research On Edge Feature-based Zero Watermarking Technology Of Comic And Animation

Nowadays, benefits of the growing popularity and rapid development internet, multimedia data release, storage and dissemination becomes more and more convenient and efficient. But with the development of internet, unauthorized behavior like wanton dissemination and arbitrarily tamper, moreover, infringing personal copyright recur often, so copyright protection problems about digital works has become an urgent problem to be solved. Because the high attention and multi aspect relates of copyright protection, digital media copyright protection problems has become a very important and challenging topic.This dissertation took the zero watermarking algorithm as the main idea, carried out the experimental studies with animation multimedia works as the research object, ensure that for the current network spread widely cartoon works has the best copyright protection effect. compared with the traditional digital watermarking technology, zero watermarking technology does not change the data of original image and use the image itself feature to constructs the unique watermark, and combined with a third party to achieve the function of copyright protection. Under the good non-sentience, in order to improve the zero-watermarking algorithm robustness, using the contourlet transform with good multi-scale and multi direction analytical characteristics processing raw vector.Firstly, used the normalization method based on moment to ensure the cartoon works with better resistance attack ability, then through the image own moment to find a set of appropriate transformation parameters, transform the original works to the corresponding standard form. This way can improve the ability to resist attacks.Secondly, We know the most significant feature of cartoon works is clear contour lines. Therefore, contourlet transform has a unique advantage to expression the multi-resolution and multi-scale, multi directions analysis for the outlines of tiny direction. Do 2 levels LP decomposition to original image and extracting the low frequency coefficients, after that through the simple realization of non-negative matrix factorization to reduce the algorithm complexity and storage space appropriately.Finally, introduced the binary watermark image and processed it with encryption by using visual cryptography, meanwhile, this process way will improve safety performance of watermarking algorithm. At last the zero watermark sequence is acquired by logical operation and registered it to third party, then, completed zero-watermark embedding process.The results showed that the zero watermarking algorithm of comic and animation based on the features make full use of the original works own feature and characteristic to achieve the copyright protection effect, meanwhile also make full use of zero watermarking technology. To a certain extent this way improved the watermark robustness and imperceptibility. By attacks experiments and comparison experiments prove that the new algorithm compared with the traditional digital watermark algorithm is more suitable for copyright protection to animation category digital works and has good performance.