Research And Application Of Robust Digital Watermarking Algorithms Based On Color Images

Digital Watermarking technology combines the ancient Hiding technology andthe digital image processing technology. Through embedding the watermarks into thedigital images, audio, video, text and other multimedia information resources usingthe digital signal process methods, the watermarks can be used to prove theownership of products, track piracy, control the copy operation of digital products,certificate the authenticity and integrity of their content. Nowadays, it is very urgentto protect the copyrights of digital products, which makes the study about robustnessof watermark becomes a key problem in the field of Digital Watermarkingtechnology.The existing color image digital watermarking algorithms are mostly based ongray image or one-color image, and for the well known Human Visual System(HVS)and Discrete Wavelet Transform(DWT) double-color image digital watermarkingalgorithms, their robustness are still needed to be enhanced. In addition, therobustness of digital watermarking technology in the application of e-commercerights management is also a problem full of realistic significance. Trying to challengethe two problems, a study of double-color image digital watermark technology iscarried out. The main research works presented in this thesis are follows:Firstly, analyze the robust digital watermarking and its evaluation criteria deeply,and also made a research on HVS, DWT and Arnold scrambling transformation.Secondly, study the digital watermark algorithm of two color images, and madea research on the digital watermark algorithm of two color images based on HVS andDWT, and analyze its advantages and disadvantages. The thesis puts forward animproved method for the algorithm, and presents the improved HAD digitalwatermark algorithm and its realization. The experiment results show that HADalgorithm makes the watermark more robust against some attacks.Finally, analyze the status of the image copyright in E-Commerce, particularlythe copyright dispute issues between merchants in E-Commerce. In this thesis, robustwatermarking technology is applied to image rights management system inE-commerce.