摘要
给出了一种基于DWT的稳健水印算法，水印采用灰度图像。将载体图像进行3级小波变换，选择CA3、CH3、CV3、CD3、CH2、CV2、CD2作为载体系数，嵌入时，根据视觉特性，嵌入不同的强度。水印在嵌入前先进行Amold变换以消除象素之间的相关性，然后进行DCT变换，以保证水印的稳健性。实验表明此算法对JPEG压缩、剪切、旋转、中值滤波、噪声等攻击有较好的稳健性。
A robust watermarking algorithm based on DWT and DCT is proposed. The watermark is a gray image.We do 3 - level DWT transformation to the cover image and select CA3, CH3, CV3, CD3, CD2, CH2, CV2, CD2 to embed the watermark. Before embedding we take several intensities to embed. We first do Arnold transformation to the watermark in order to cancel the co -relationship between the pixels and then take DCT transform to it in order to improve its robustness. The experiment shows that the algorithm has high ability to against JPEGcompression, , croo. rotate, filter and noise.
