关键词: RGB空间, 彩色零水印, 鲁棒性, Arnold置乱

Abstract: Aiming at the problems that the copyright identifications are mostly binary image with single structural information, and the robustness of geometric attacks is poor in existing zero watermarking algorithm, this paper proposes a color zero watermarking algorithm in RGB spatial. Firstly, convert the color carrier image and color watermark into R, G, B color components. Then, perform Arnold scrambling and block processing on the three spatial components of the carrier image. Secondly, calculate the mean value for each sub-block of each channel, constitute a decimal mean matrix, convert the mean matrix to an 8-bit binary matrix, and generate three color channel binary feature matrices. At the same time, the scrambled color watermark component is converted into 8-bit binary watermark information, and the three binary feature matrices are respectively XOR with the carrier image to generate three zero watermarks. Finally, the three zero watermarks generate a color zero watermark by inverse coding technology. Experimental results show that the algorithm can effectively resist non-geometric attacks, geometric attacks and combined attacks. Compared with the similar zero watermarking algorithms, the algorithm has better robustness and higher security.

Key words: RGB space, color zero watermarking, robustness, Arnold scrambling