基于小波分解的数字图像水印处理算法

提出了一种基于小波的隐藏数字水印的新方法。该方法将一幅二值图像作为水印来隐藏，基于JPEG2000标准，将水印和图像均进行多尺度分解，然后将分解的水印低频系数嵌入到具有相同尺寸的图像的低频系数中，重构得到水印图像；水印分解中的高频系数将被保留，并在水印检测过程中作为密钥使用。检测水印时，需要原始的未加水印的图像。实验结果表明，算法对压缩、加噪、线性滤波、剪裁等具有较高的鲁棒性。

A wavelet based on the ditial image watermarking algorithm

A new watermark algorithm based on wavelet is proposed. Based on JPEG2000 standardization, the image and watermark are both transformed into the discrete wavelet domain. Then, the lower frequency coefficients of the watermark are embedded into those of the image with the multiresolution data fusion. Finally, the associated coefficients are restructure to obtain the embedded image. Especially, in this embedding process, the higer frequency coefficients of the watermark multiresolution data are reserved and will be used as the secret key in the detection process. The original image is used in the proposed detection algorithm. The experimental results show that it is robust against compression, adding noise, filtering, and cropping.