Research On Digital Watermarking Algorithm For Color Images Based On HVS

Digital image watermark, as a branch of data hiding technology, imbeds symbol information into the protected image using the redundancy attribute of Human Visual System. As an effective approach of copyright protection of digital image, it has become a hotspot in the field of information security recently.In this paper, my work is mainly about a double-level watermarking algorithm based on human vision identity. In this algorithm, in control of two different keys two different watermarks are encrypted then respectively embedded in the wavelet coefficient of color cover images, and the watermark could be extracted according to the secret key , and that was blind watermarking extracting, so the security of the algorithm is better.The experiments show that the algorithm is of better invisibility and is robust against JPEG compression and attack such as noise, cut and filtering, and receives a good tradeoff between invisible and robustness, and improves the dependability of detecting the watermark, and can effectively protect image copyright.