A copyright protection scheme for digital image using chaos and fractal compression

A copyright protection scheme based on self-similarity of discrete wavelet transform (DWT) is proposed. Instead of modifying the original image to embed a watermark, the proposed scheme utilizes the self-similar property and DWT to generate a watermark certificate from a protected image. The proposed scheme has the following advantages. First, the proposed scheme does not modify the protected image. In other words, the proposed scheme is lossless. Second, the original image is not necessary in the verification process. Third, the proposed scheme is robust to several image processing attacks such as JPEG and JPEG2000 compression, blurring, sharpening, noise adding, and scaling, etc. Last, the proposed' scheme can meet some important characteristics that an efficient watermarking scheme should possess.