一种基于卷积码的小波域音频水印盲检算法-计算机应用研究.PDF

第 3 期 王让定等: 一种基于卷积码的小波域音频水印盲检算法 1·19 · 一种基于卷积码的小波域音频水印盲检算法 * 王让定, 陈金儿, 杜呈透, 徐达文 ( 宁波大学 纵横智能软件研究所, 浙江 宁波 315211) 摘 要: 水印系统的顽健性是数字水印研究者最为关注的问题。借助卷积码的编解码思想, 在小波域研究了自 适应于音频的扩频水印算法, 将视觉可辨的水印经过预处理后嵌在所选的中、低频小波子带。为了提高算法的 顽健性, 提出了适合 Viterbi 软解码的水印检测改进算法, 水印检测不需要原始音频。实验结果表明, 基于卷积码 的音频扩频水印算法具有很高的顽健性, 能完全抵制信号处理型攻击。 关键词: 音频水印; 卷积码; 盲检; 软判决 中图法分类号: TP309. 2 文献标识码: A 文章编号 : 1001- 3695( 2005) 03- 0119- 03 An Audio Watermarking Blind Algorithm Based on Convolution Codes in Wavelet Domain WANG Rang-ding, CHEN Jin-er, DU Cheng-tou, XU Da-wen ( Institute of CKC Software, Ningbo University, Ningbo Zhejiang 315211 , China) Abstract: The robustness of watermarking system is more and more paid attention by digital watermarking researcher. With the help of convolutional idea, the adaptive audio watermarking algorithm is investigated in wavelet domain in this paper. The visually recognizable watermark pre-processed is embedded into middle and low frequency sub-band in wavelet domain. In or- der to enhance robustness, the detecting improved algorithmwhich use Viterbi soft-decision is presented, and detecting water- mark don’t need original audio. The experimental results show that the proposed algorithm is provided with high robustness, and sustainable against compression algorithms, as well as common signal processing manipulation attacks. Key words: Audio Watermarking; Convolutional Code; Blind Detection; Soft-decision 号的自身特点, 音频数字水印技术得到了广泛研究, 研究目标 1 引言 也从版权保护扩展到了作品内容的完整性认证、数字指纹等许 多其他的应用领域[ 3]