Abstract: This paper proposes a harr wavelet transform Image watermark algorithm based on lifting scheme. In the algorithm, the watermark is performed a m-sequence transform. It generates the secret key by performing the exclusive-or operation of watermark and the low frequency coefficient of the host image after discrete wavelet transform. After inversing discrete wavelet transform, the host image is obtained. Experimental results demonstrate that the watermark algorithm has good robustness against the attacks such as rotation, image compression, noise addition, filtering, clipping and other image processing.

Key words: digital watermark image, m-sequence, Discret Wavelet Transform(DWT), lifting scheme

摘要： 提出一种基于提升方案的harr小波变换的图像水印算法。该算法将水印图像通过m序列实现图像的置乱，与经过小波变换后的载体图像的低频系数值按位进行异或得到需要的密钥，原始图像由小波反变换得到。实验结果证明，该图像水印算法对图像的旋转、压缩、噪声、滤波、剪切等攻击具有较好的鲁棒性。

关键词: 数字水印图像, m序列, 离散小波变换, 提升方案

CLC Number: 

• TP393