摘要
针对多人共享版权时,需要同时嵌入多个用户水印,并要能够进行独立认证等要求,文章提出了一种基于CD-MA和HVS的多用户数字水印算法。该算法在用户水印嵌入之前,引入人类视觉系统模型,利用CDMA自身的扩频作用来提高水印的鲁棒性。仿真实验结果表明该算法能有效解决单水印数据嵌入量少、多用户水印存在水印碰撞、水印叠加嵌入相互影响、用户数量增加时水印作品质量严重下降等问题。
When multi-users sharing copyright,multi-user digtal watermark is required the system and certificated independently.For this purpose,a multi-user digital watermark algorithm based on CDMA and HVS is proposed in this paper.Before watermark is embedded,the human visual system HVS model is introduced.Then,this algorithm applies CDMA＇s function of expanding spectrum to improve the robustness of the watermark.Simulation results show that this algorithm can effectively solve the defects such as single-user watermark data less,multi-user watermark collision,interference caused by watermark overlay and quality decline caused by users increasing,and so on.
出处
《计算机与数字工程》
2010年第4期108-110,141,共4页
Computer & Digital Engineering
基金
浙江省科技厅项目(编号:2009C31087)
浙江省教育厅项目(编号:Y200805137)资助
