In this study a method for digital image watermarking is used that is resistant to geometric transformations. A private key is used to construct circularly symmetric watermark, which is embedded on a ring in the DFT domain. Because correlation is used for watermark detection, the original image is not required in detection. This method is resistant to JPEG compression, filtering, noise addition and cropping. Results prove the robustness of this method against the above-mentioned attacks.

The whole report is here in Turkish.