基于归一化图像的小波域水印算法

提出了一种基于小波变换的抗几何攻击数字图像盲水印算法.首先本算法以基于矩的图像归一化技术和不变质心理论为基础,获得嵌入水印的兴趣区域.其次,将得到的兴趣区域分成4块,分别对其进行小波变换后将其中3个低频子带嵌入水印,而将另一个低频子带计算量化步长.然后,将水印利用量化调制方式自适应地嵌入到小波域的低频系数.实验结果表明,该算法不仅具有较好的不可感知性,而且对几何攻击和常规信号处理都具有较好的稳健性.

Normalization Image Based Robust Watermarking Algorithm in Wavelet Domain

Algorithm of blind digital image watermarking robust to geometric attacks wavelet-based is proposed.In this algorithm,based on invariant moment image normalization technology and invariant centroid theory,normalized image get an interest regions of embed watermark.Then,the interest regions will be divided into four,respectively,after its wavelet transform with 4 low-frequency sub-band,3 of which used to embed watermarks,another used to calculate the quantization step.Especially,the watermark is adaptively embedded into interest region by quantizing low-frequency wavelet coefficients.Experimental results show that the proposed algorithm is not only better transparency,but also significant robust against geometric attacks and common signals processing.