一种抗JPEG压缩的半脆弱图像水印算法

半脆弱水印因为在多媒体内容认证方面的重要作用而受到人们密切的关注.为了能够区分偶然攻击与恶意篡改,半脆弱水印需要对一般的内容保护图像操作有一定的鲁棒性.由于JPEG压缩应用的普遍性,在保持较高的对篡改检测能力的情况下,提高抗JPEG压缩性能一直是半脆弱水印的重要问题.根据图像相邻小波高频系数之间的大小关系在JPEG压缩之后大多数没有发生变化这一事实,提出了一种新的抗JPEG压缩的半脆弱水印算法.实验结果表明,该算法计算简单,嵌入容量大,有很好的抗JPEG压缩性能,同时对篡改的定位也很精确.

A Semi-Fragile Image Watermarking Resisting to JPEG

Semi-Fragile watermark has attracted attention due to its important role in content authentication for multimedia. In order to differentiate incidental attacks and malicious attacks, semi-fragile watermark must be robust against content-protection image processing. Semi-fragile watermark resisting to JPEG compression while maintaining high detection ability to tamper has been the emphasis in this area. In this paper, a semi-fragile watermarking algorithm to resist JPEG is proposed based on the fact that most of the coefficients of high frequency have the same relative energy relations after JPEG compression. The experimental results demonstrate that the proposed algorithm has the advantages such as simple computation complexity, big embedding capability, good robustness to JPEG, and exact location for tamper.