A Color Image Watermarking Scheme Against Geometric Rotation Attacks Based on HVS and DCT-DWT

In view of poor robustness and weak resistance to geometric attack of traditional image watermarking algorithm, this paper proposes a color blind watermarking algorithm based on the combination of wavelet intermediate frequency (DWT) and discrete cosine transform (DCT). First, the original image is transformed from the RGB color spaces into the YCbCr color spaces in which the watermark is embedded into all the three color spaces. Then, the position in which watermark was embedded was chosen by Human Visual System (HVS), and the watermarking embedding is achieved by the proposed algorithm based on DCT and DWT transform. In this process, Zernike moments are used for rotation correction. The experimental results show that the algorithm is robust, and the invisible watermarking’s ability of anti–geometric –attacking has been improved.