基于图像熵分类的移动终端数字水印算法

本文围绕移动终端多媒体数据版权保护问题，针对移动终端处理能力弱和内存小的特点，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，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，本算法在提高码书质量的同时，能有效的减少码书训练时间；并对JPEG压缩、剪切、小角度旋转等图像攻击具有较强的鲁棒性。

A Digital Watermark Algorithm for Mobile Terminal Based on Image Entropy Classification

This paper focuses on multimedia data copyright protection for mobile terminals. Since mobile terminals have intrinsic weakness of processing and memory capacity, a novel codebook design algorithm, which is based on image entropy classification, is proposed to compensate. To achieve high quality watermarked image, complex texture image regions have the priority of watermark image embedding. In addition, the conventional search algorithm is substituted for the equal-average equal-variance nearest neighbor search algorithm to accelerate the search speed. Experimental results show that the proposed algorithm not only achieves high quality codebook, but also shortens the codebook training time. The proposed algorithm is robust to common image processing algorithms such as JPEG compression. cropping and small degree of rotation.