基于小波变换和奇异值分解相结合的加密图像数字水印算法

以一种加密算法和多级小波变换,奇异值分解为基础,提出一种数字水印算法.将原始图像进行多级小波分解,然后对低频部分进行奇异值变换,将加密的水印信息嵌入其中.实验结果表明:该算法不仅具有较好的不可感性,而且对几何变换,如旋转、剪切、镜像,叠加噪声如椒盐、高斯噪声及高斯滤波等均具有很好的鲁棒性.

An encrypted digital watermarking algorithm for images based on wavelet transform and singular value decomposition

A watermarking algorithm digital image based on an encryption arithmetic and Disperse Wavelet Transform and Singular Value Decomposition is proposed in this paper. First, we use Disperse Wavelet Transform to analyze the original images. Then, based on block Singular Value Decomposition,a new algorithm for embedding the watermarking into the low frequency part is proposed.The experiment based on this algorithm demonstrates that the watermark is robust to the geometry transform (rotate, crop) and the common signal processing techniques including salt and pepper noise, low pass filter.