基于intDCT和扩展嵌入的可逆脆弱认证水印研究  

Reversible fragile watermarking for authentication based on integer DCT and expansion embedding

作　　者：陈权[1,2] 项世军[2] 

机构地区：[1]广东医学院信息工程学院,广东东莞523808 [2]暨南大学信息科学技术学院,广东广州510632

出　　处：《山东大学学报（理学版）》2012年第11期24-30,39,共8页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金项目(60903177;61272414);广州市科技计划应用基础研究专项重点项目(2012J4100108);暨南大学国家级大学生创新创业训练计划项目(50421292)

摘　　要：可逆音频水印能够在水印信息提取后无损恢复原始音频载体,可用于完整性认证和篡改识别。通过使用整数离散余弦变换(integer discrete cosine transform,intDCT)和扩展嵌入技术,提出了一种可逆脆弱音频水印认证算法。发现了音频帧在经过intDCT变换、幅度扩展嵌入和intDCT逆变换后会出现较大的失真,详细分析了失真的成因并提出了解决对策;在DCT域,通过对高频部分分别应用差分扩展和预测误差扩展两种嵌入策略,设计了两种可用于音频完整性认证的可逆脆弱水印方案。实验结果表明所提出的算法具有较小的嵌入失真和满意的嵌入容量,能够很好地进行完整性认证和篡改定位。Reversible audio watermarking can restore the original audio data after extracting the watermark and be used for integrity verification and tamper detecting. A reversible fragile watermarking scheme was proposed for audio using intDCT （ integer discrete cosine transform） and expansion embedding technology. It is noting that a audio frame would be distorting after undergoing intDCT, amplitude expansion embedding and inverse intDCT. The reason of the distortion was analyzed and the corresponding solution was proposed. Two reversible watermarking algorithms for audio integrity verification were proposed. They employed two different embedding strategies, difference expansion embedding and pre- diction error expansion embedding in DCT high-frequency domain respectively. Experimental results show that the proposed algorithm can achieve less distortion and satisfied embedding capacity for integrity verification and tampering location.

关 键 词：音频 可逆水印 intDCT 完整性认证 扩展嵌入 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]