基于SVD和分块DCT的半脆弱图像水印算法<br>Semi-Fragile Image Watermarking Method Based on SVD and Block DCT

Abstract

随着多媒体内容的完整性认证，尤其是图像的完整性验证，解决方案主要集中在脆弱数字水印技术。本文提出基于SVD和分块DCT的半脆弱水印算法。算法将水印信号嵌入图像第二大奇异值中，并利用Watson模型控制嵌入强度。实验表明算法达到了不可见性、盲检测性、区分合理与不合理失真等半脆弱水印的基本要求，并能较准确识别篡改区域，具有一定实用性。 With the certification of the integrity of the multimedia content, the solutions are mainly concentrated on fragile digital watermarking technology. This paper present a semi-fragile watermarking algorithm based on SVD and sub-block DCT. The watermarking signals are embedded into the second biggest singular values of the image. Watson model is used to control the robustness of embedding. Experiments demonstrate that the algorithm meets the basic goals of semi-fragile watermarking: imperceptible, blind detection, distinguishing legitimate distortions from illegitimate ones, and the algorithm has some practical use.