一种改进的回声隐藏算法  

An Improved Algorithm for Echo Hiding

作　　者：胡大辉[1] 杜治国[1] 

机构地区：[1]西南大学信息管理系,重庆402460

出　　处：《西南师范大学学报（自然科学版）》2012年第9期109-114,共6页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：西南大学青年基金支持项目(2010RCQ003)

摘　　要：回声隐藏算法利用人类听觉系统的时域掩蔽效应来隐藏水印信息,其工作原理是人耳基本不能分辨强信号消失前嵌入的弱信号.针对回声隐藏算法中水印恢复准确率较低的问题,提出一种基于离散余弦变换和交织编码的隐藏算法.算法对水印图像进行离散余弦变换使其隐蔽效果更好,将变换后的信息进行交织编码以提高对常见攻击的免疫.实验证明,新算法的水印隐藏效果好、恢复率高,对常见的恶意攻击具有较好的免疫效果.Echo hiding algorithm can be used to hide the watermark information by means of the time-do main masking effects of human auditory system. It relies on the basic principle that human ear can not dis tinguish the embedded weak signal before a strong signal disappears. As the recovery accuracy of echo hid- ing watermark is low, a hidin proposed. The algorithm can g b algorithm based on the discrete cosine transform and interleaving coding is e used to hide image watermark better after discrete cosine transform. In order to improve immunity against common attacks, the information is transformed into interleaved codes. Experiments show that this algorithm can be used to hide Watermark better and to recover efficiently, which is immune to the common malicious attacks effectively.

关 键 词：回声隐藏 离散余弦变换 交织码 归一化相关系数 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]