Based On Visual Characteristics Of The Human Eye Physiology Digital Watermark Technology

Digital watermarking is an effective technique to protect the copyright of digital products, and has been widely researched and applied. The capacity of watermark is very important to the application of digital watermark. In this paper, two novel digital watermarking algorithm are proposed. One is the double-level watermarking algorithm based on the human vision identity, which is designed combining with human vision identity and based on the DCT transform. In this algorithm, in control of two different keys two different watermarks are respectively embedded in the two components of color cover image, so the security of the algorithm is better. The experiments show that the algorithm is of better invisibility and robustness of cut, blur, sharpen and so on, and can effectively protect image copyright.Another is high-capacity and multi-channel digital watermarking algorithm, the key of which is improving the capacity of watermark embedded in the digital image. In this algorithm, a color image is used as original cover image, by way of compress coding of the digital watermarking, the transform of color space of cover image, the DCT transform of multicolor components, according to HVS to ascertain the position of watermarked and so on, the planar high-capacity watermark image can be embedded in color cover image. Experiments show that this algorithm not only increases the capacity of watermark but has robustness of cut, blur, sharpen and so on.