扩频数字水印中混沌序列的选取  

Research on the Choice of Chaotic Sequences in Spread Spectrum Watermarking

作　　者：冯国瑞[1] 蒋铃鸽[1] 何晨[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2004年第11期1802-1805,共4页Journal of Shanghai Jiaotong University

基　　金：国家高技术研究发展计划(863)项目(2002AA144110);国家自然科学基金资助项目(60272082)

摘　　要：对一种特殊的一维离散混沌映射进行分析,通过对其参数进行调节,得到在扩频数字水印中应用的序列.与Chebyshev混沌序列比较,发现该混沌序列本身具有很好的低通特性,利用它作为水印的扩频码,可以提高扩频水印的抗压缩性能,同时也保证了扩频水印本身所具有的安全特性.仿真结果表明,该低通混沌序列扩频数字水印的抗压缩性能与混沌序列的选取有很大的关系.A distinguishingly one-dimensional chaotic map was analyzed, and then by adjusting the parameter of the map, the sequences using spread spectrum watermarking were obtained. Compared with Chebyshev chaotic sequences, the sequences show the lowpass characteristic well. Taking the sequences as the spread spectrum, the sequences of watermark can enhance the compression resistance performance of watermarking system, and maintain the security. The simulation results show that the performance to resist the compression is related with the chaotic model in the chaotic spread watermarking.

关 键 词：数字水印 扩频 混沌映射 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]