针对移动终端多媒体数据的版权保护问题,为克服移动终端处理能力弱和内存小的缺点,采用基于图像熵分类的方法设计码书,同时在水印嵌入过程中,优先将水印信息嵌入于复杂度较高的纹理区域,以提高嵌入水印后的图像质量,并采用等均值等方差最近邻码字搜索算法代替传统搜索算法以缩短编码时间.实验证明,文中方法能在提高码书质量的同时,有效减少码书训练时间,并对JPEG压缩、剪切图像攻击具有较强的鲁棒性.

In order to protect the copyright of multimedia data of mobile terminals,improve the processing ability and enlarge the memory capacity of mobile terminals,a digital watermarking method is proposed.In this method,a novel codebook is designed based on the image entropy classification,the priority of watermarking embedding is provided for complex texture image regions to obtain high-quality watermarked image,and the conventional search algorithm is substituted with the equal-average equal-variance nearest neighbor one to accelerate the coding.Experi-mental results show that the proposed method can not only improve the codebook quality but also save the codebook training time,and that it is robust to common image processing such as JPEG compression and cropping.