A Zero-watermarking Algorithm based on Image Normalization and Fractal Coding
Jingping Liu · Computers & Security · 2013
In order to improve the watermark’s stability and the ability to resist geometric attacks,this paper puts forward a kind of zero-watermarking algorithm combined image normalization and fractal theory.Firstly,the image’s geometrically invariant space is constructed by using the image normalization method,the significant area is gained from the normalized image by using the geometric center.Then the significant area is encoded by fractal coding.The edge information will be obtained from the collage error of the image’ s fractal coding.That is the image feature information.Finally,do certain processing on the watermark and feature information to achieve the key matrix.It will be used in detecting watermark.The experimental results show that this approach has good performance to the image processing and geometric attack.