Visual Robust Oblivious Watermarking Technique Using Edge Effect and Denoise Filter
Chih-Ming Kung, Weizhi Cheng · 2006
Watermarking is one of commonly used techniques to hide information in images to discourage unauthorized copying. When the watermarked images are distributed via the public channels, the unauthorized copying may be discouraged. This is because the owner can prove his ownership by extracting the watermark using open algorithms and some security keys. In the scheme, two parts, contour and texture, are separated with the character of human's vision. Position them into different frequency to protect the important character of vision. To promote the PSNR value, the most common methods, the denoise and adaptive Wiener filter, are implemented after combining the extracted watermark and the extracted contour. To solve the restoration of the image fusing multiple image filters is used. And the performance of fusion algorithm is based on redundant and complementary information offered by different filter.