Color Image Watermarking based on the DCT-Domain of Three RGB Color Channels

Color image water marking is becoming increasingly important and finding application in diverse areas of discipline. Developing robust image water marking algorithm which is immune to noise, cropping and compression is a challenging task. Altering the size of the image or its orientation reduces the recoverability of the watermarked image. In this paper, we proposed a new block DCT-based digital watermarking scheme based on embedding an adapted watermark in the three RGB channels of the original colour image. Voting is used to extract the best candidate pixel value. The proposed embedding procedure improves the imperceptibility and the robustness of the watermarked image against the different attacks such as noise, cropping and JPEG compression. Experimental results have shown superiority of the proposed scheme over a classic DCT watermarking.