Abstract: Aiming at the image tamper restore problem, this paper proposes a self-fragile authentication watermark embedding method. The method extracts the image sub-block size of 2×2 gray mean by chaotic encryption mapping to determine the embedded bit-plane and the automor- phism mapping information as a watermark, embeds it into the original image for all pixels in the two least significant bit. This method does not need any original image and additional information relating to a watermark, it can implement the exact detection and location of small image tampering and restore it to the image sub-block. Experiment and analysis show that the method of arbitrary tampering with extremely sensitive to restore image quality and better safety performance.

Key words: authentication watermark, image authentication, tampering location, tampering recovery

摘要： 针对数字图像的篡改恢复问题，提出一种自嵌入的脆弱认证水印方法。提取图像2×2分块的灰度均值，经混沌映射加密、嵌入位平面确定和自同构映射后，作为水印信息嵌入原始图像所有像素的2个最低有效位中。该方法在图像认证时无需原始图像和任何有关水印的附加信息，可实现对细小图像篡改的准确检测定位并恢复到图像分块。实验结果与分析表明，该方法对任意的篡改极其敏感，恢复图像质量较好，安全性能较高。

关键词: 认证水印, 图像认证, 篡改定位, 篡改恢复

CLC Number: 

• TP391