Combined watermarking for image authentication and protection

A novel combined watermarking scheme for image authentication and protection is proposed in this paper. By utilizing the publicly available wavelet-based just noticeable distortion (JND) values, the hidden watermark is designed to carry the host image's information such that blind watermark detection becomes possible. The watermarks are embedded using the previously proposed cocktail watermarking technique and are extracted by a quantization process. According to the polarities and the differences of the hidden and the extracted watermarks, the fragility and robustness of a watermark can be measured, respectively, such that both content authentication and copyright protection are achieved simultaneously.