A robust watermarking scheme for digital image using self similarity

The robust watermarking technique has been generally discussed for protecting the copyright of digital media. The paper proposes a watermarking technique with self similarity to achieve the requirement of robustness. Instead of modifying the original image to embed a watermark into an image, the proposed scheme extract a watermark from a protected image by using self similarity between wavelet sub-bands. In the verification stage, the watermark extracting does not need the original image but the attacked image. Then the extracted watermark is compared with the original watermark for copyright verification. The proposed method has the following advantages. The first one is that the proposed method does not modify the protected image. The second one is that the original image is not necessary in the verification process. The third one is that the proposed method is robust to resist several image processing attacks such as JPEG and JPEG2000 compression, blurring, sharpening, noise adding, and scaling.