基于局部相关匹配的小波变换图像水印方法*

现有局部感兴趣区域的水印嵌入方法在选取感兴趣区域时未考虑水印信号能与载体图像局部相似的特性，本文提出一种基于局部相关匹配的小波变换图像水印方法。该方法利用Arnold变换对水印图像加密，采用相位相关法选取合适的水印嵌入区域，并根据图像纹理的差异在小波的高频和低频系数上分别嵌入水印信息。水印检测时，在嵌入水印的区域提取出多个水印信息，将多个水印信息的加权平均作为检测水印。实验结果表明，该方法嵌入水印的不可见性及抗噪声和压缩的性能较好。

Wavelet transform watermarking method based on local phase correlation

When embedding watermarks into guest images, most of the previous watermarking methods ignore the similarity between the local region of the guest images and the watermarks. The paper presents a wavelet transform watermarking method based on local phase correlation. The method uses Arnold transform to encrypt the watermark image, and select proper watermark embedding area with phase correlation method, then embed watermark information separately to high and low frequency coefficients according to the differences of texture. When the watermark is checked, watermark information is collected in embedding area. We use the weighted average value of watermark information above as checking watermark. The experimental results show the good performance of the invisibility of embedding watermark and anti-noise and compression.