An image fragile watermark scheme based on chaotic image pattern and pixel-pairs
An image fragile watermark scheme based on chaotic image pattern and pixel-pairs
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DOI：
10.1016/j.amc.2006.07.036
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
Shaohui Liu;H. Yao;Wen Gao;Yongliang Liu
中科院分区：
文献类型：
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作者：
Shaohui Liu;H. Yao;Wen Gao;Yongliang Liu
数字内容脆弱水印技术是近年来研究的热点。脆弱水印用于判断加水印的数字内容是否被篡改，并在不参考原始数字内容的情况下区分篡改区域和非篡改区域。提出了一种通用的脆弱水印框架，并在此基础上提出了一种新的用于图像认证的脆弱水印方案。脆弱水印的嵌入过程首先计算宿主图像与其混沌模式的差分图像，然后将差分图像映射为二值图像。然后将二进制图像插入到主机图像的最低有效位（LSB）位平面中。另外，利用混沌映射生成混沌模式图像，作为密钥提高水印算法的安全性。由于采用了置乱变换和混沌图像模式，打破了水印图像中的像素与水印之间的对应位置关系。仿真结果和性能分析表明，该方法具有快速、安全、检测和定位修改的能力。
Fragile watermarking techniques for digital content have been studied in the past few years. Fragile watermarks are used to determine if a piece of watermarked digital content has been tampered, and distinguish tampered areas from non-tampered areas without referring to the original digital content. In this paper, a general framework for fragile watermark is proposed, and then a novel fragile watermarking scheme for image authentication is presented. The embedding process of fragile watermark starts from computing the difference image between the host image and its chaotic pattern, followed by mapping the difference image into a binary image. The binary image is then inserted into the least significant bit (LSB) bitplane of the host image. In addition, chaotic map is used to generate the chaotic pattern image, which can be used as secret key to improve the security of watermark algorithm. Due to employing permutation transform and chaotic image pattern, the corresponding position relation is broken between pixels in the watermarked image and the watermark. Simulation results and performance analysis show that the presented method is fast, secure and capable of detecting and localizing modification.