一种奇异值分解数字水印算法的研究

提出了一种可用于印刷品防伪的数字水印算法。将二值条码作为水印,嵌入到原始图像的奇异值分解的S分量。结合人类视觉系统（HVS）的视觉掩蔽特性,根据图像的块均匀度决定水印嵌入的强度,使嵌入的水印强度能够自适应于原始图像。水印提取时,利用Radon变换对待检测图像进行校正,并且根据二值条码的特性对提取出的水印图像进行了修正。实验结果表明,算法对一些常见的图像处理和几何攻击具有良好的鲁棒性。

A Digital Watermarking Algorithm Based on SVD

In this paper,an adaptive watermarking algorithm of image based on Singular Value Decomposition（SVD） is proposed.Binary barcode is taken as watermarking embedded into the S component of SVD.By exploiting the visual masking and texture characteristics of Human Visual System（HVS）,the strength of embedded watermarks is decided by the gray and texture of the original image.It ensures the self-adaptation of the intention of the embedded watermarks to the original image.The watermarked image is adjusted by using Radon transform before the watermarking is extracted and then the extracting barcode is corrected according to the characters of itself.The experimental results show that the proposed algorithm is invisible and robust against many commonly used image-processing methods and especially against geometric attack.This technology will be of good application in printing security.