A Zero-Watermarking Visual Cryptography Algorithm Based on MSB
Li Chunyan;College of Engineering, Honghe University;
The existing zero- watermarking visual cryptography algorithms breaks down the carrier image and then combines watermark information to create zero-watermark with copyright identification. This method can enlarge the range of the interference points in the image to reduce the quality of the extracted watermark. This paper proposes a zero-watermarking visual cryptography algorithm based on MSB(Most Significant Bit). This algorithm first breaks down the watermark image by visual cryptography, and then the decomposed shadow images can be combined into a combination image of the same size of the carrier image. Last, this combination image is compared with the MSB of the carrier image, and the result is marked with a zero distance matrix. This matrix is the key to detect the watermark. In this paper, the stability of MSB and the characteristics of visual cryptography have better performance in attack resistance, and the simulation experiment results show that this algorithm has strong robustness against conventional image processing and geometric attacks.