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Computer Engineering ›› 2007, Vol. 33 ›› Issue (01): 128-130. doi: 10.3969/j.issn.1000-3428.2007.01.044

• Security Technology • Previous Articles     Next Articles

Classification of Digital Watermark Channel and Analysis of Channel Capacity

ZHOU Siqing1,2   

  1. (1. Dept. of Electronic Engineering, College of Information Science & Technology, Jinan University, Guangzhou 510632; 2. Research Centers of Management Science and Engineering Postdoctoral, Hunan University, Changsha 410082)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-01-05 Published:2007-01-05

数字水印信道分类及其信道容量分析

周四清1,2   

  1. (1. 暨南大学信息科学技术学院电子工程系,广州 510632;2. 湖南大学管理科学与工程博士后科研流动站,长沙 410082)

Abstract: In the process of digital watermark theory research, digital watermark is similar to communication system. By introducing the concept of watermark channel into digital watermark, the watermark channel and its capacity are studied for helping to design watermark embedding and attacking algorithms. Based on watermark channel with side information and whether the side information is known to the watermark encoder and decoder, watermark channel is classified into four sorts as following: watermark channel which the encoder and decoder do not know the side information, or watermark channel which only the encoder knows the side information, or watermark channel which only the decoder knows the side information, or watermark channel which the encoder and decoder all know the side information. The corresponding channel capacity is analyzed. A watermark channel capacity with embedding factor is varying monotonously with watermark embedding factor.

Key words: Digital watermark, Channel capacity, Side information, Communication system

摘要: 在数字水印理论模型研究过程中,将数字水印系统看作一种通信系统,将信道的概念引入数字水印系统,形成数字水印信道,通过对水印信道容量的研究来指导数字水印系统中嵌入算法及攻击算法的设计。基于带边信息的水印信道模型,根据水印编码方和水印译码方是否知道水印的边信息(即信道状态信息),该文将数字水印信道归纳为4类:编译码双方都不知道边信息的水印信道,仅编码方知道边信息的水印信道,编码方和译码双方都知道边信息的水印信道,仅译码方知道边信息的水印信道。对相应的水印信道容量进行了分类讨论,结果证明,这一类含水印强度因子的水印信道容量是水印强度因子的单调函数。

关键词: 数字水印, 信道容量, 边信息, 通信系统