基于MSB的视觉密码零水印算法  

A Zero-Watermarking Visual Cryptography Algorithm Based on MSB

作　　者：李春艳[1] 

机构地区：[1]红河学院工学院,云南蒙自661199

出　　处：《大理学院学报（综合版）》2015年第12期26-29,共4页Journal of Dali University

摘　　要：现有的视觉密码零水印都是对载体图像进行视觉密码分解后,再结合水印信息生成具有版权标识的零水印。这种方法放大了载体图像中受干扰点的影响范围,从而降低了水印的提取质量。提出基于MSB的视觉密码零水印算法,该算法先对水印图像做视觉密码分解,再把分解得到的影子图像组合成其大小与载体图像一致的组合图。最后用该组合图与载体图像的最高有效位(MSB)进行对应比较,其结果用一个零矩阵来标记。此矩阵即作为检测水印的密钥。所提出的MSB的稳定性和视觉密码的特点使算法具有较好的抗攻击性能,仿真实验表明该算法对常规图像处理和几何攻击具有较强的鲁棒性。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.

关 键 词：视觉密码 最高有效位 零水印 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]