Abstract:

In order to solve the fragile property of lossless watermarking algorithms in spatial domain, a new robust reversible watermarking method is proposed. Firstly, the original color image is separated into three primary colors channels: red (R), green (G) and blue (B). Then, each channel is divided into nonoverlapping blocks and the arithmetic difference is computed. The watermark information is embedded into channels repeatedly by shifting arithmetic differences according to the given rule. In the extracting procedure, the three layer watermark information can be extracted from three primary colors channels of stegoimages respectively, and the final water information is generated based on voting theory. Experimental results show that the proposed scheme can resist JPEGcompression, the Gaussian noise, salt and pepper noise attack, and has better robustness.

Key words: copyright protection；lossless watermarking；robustness；majority voting