一种基于正交化分形编码和混沌相结合的脆弱数字水印技术

以图像篡改定位为目的，提出了一种基于正交化分形编码和混沌相结合的脆弱数字水印技术。该算法利用宿主图像的分形编码参数信息作为混沌映射的初值，从而通过混沌映射产生混沌二值水印，所产生的混沌二值水印再嵌入到宿主图像中，从而实现图像的篡改定位。算法能有效的检测图像是否被恶意篡改，并且不同宿主图像能够产生不同的混沌二值水印，加强了算法的保密性，在处理大批量图像的时候优势更明显。实验数据表明，算法可行有效，拥有良好的图像篡改定位能力。

Fragile watermarking algorithm based on orthogonal fractal coding and chaos

For the purpose of image tampering localization, a fragile digital watermarking method is proposed on the basis of orthogonal fractal coding and chaos. The algorithm use the fractal coding parameters as a key to create the chaotic binary watermark to be embedded into the fractal coding field, so as to realize the image authentication. The algorithm can effectively detect whether the image is malicious tampered, and different host image will produce different chaotic binary watermark, which strengthen the confidentiality of the algorithm, especially in the face of mass image processing. The simulation results show that the proposed algorithm is efficacious and practical, and has precise tamper localization to grayscale images.