一种用于彩信业务版权保护的DWT图像水印

为了解决目前彩信业务版权保护、使用控制及计费管理等问题，设计了一种基于离散小波变换（DWT）的双结构频域水印算法，利用小波变换对原始载体图像进行多分辨率分解，经过Arnold变换实现对包含提供商和网络运营商信息的两张二值水印的置乱，根据原始图像小波低频系数的特点，将经过置乱处理的两张二值水印嵌入到载体图像，实现对彩信数字权利的管理和保护。仿真实验结果证明，该水印方案具有非常好的不可见性，对常见的图像伤害（如剪切、JPEG压缩、加噪等）具有很强的抗干扰性，基本满足彩信业务的要求。

DWT Image Watermarking and Its Application in Copyright Protection of MMS

In order to protect the copyright of mobile digital contents and solve the problem of interest distribution between network operators and content providers in Multimedia Messaging Service(MMS),a robust image watermark algorithm is proposed based on discrete wavelet transform(DWT).Two independent watermarks,which represent the messages of content providers and network operators,are embedded in the low-frequency sub-band after multi-resolution decomposition.The results of experiments show that the watermarking image is invisible and robust against a number of attacks such as cropping,noising,JPEG compression,and it satisfies the basic requirements of the MMS.