基于稳健特征点的平稳小波域数字水印算法  

Digital watermarking algorithm in SWT domain based on robust local feature

作　　者：牛盼盼[1,2] 杨思宇 王丽 杨红颖 李丽[1] 王向阳[1] NIU Panpan;YANG Siyu;WANG Li;YANG Hongying;LI Li;WANG Xiangyang(School of Computer and Information Technology,Liaoning Normal University,Dalian 116029,China;Faculty of Electronic Information and Electrical Engineering,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]辽宁师范大学计算机与信息技术学院,辽宁大连116029 [2]大连理工大学电子信息与电气工程学部,辽宁大连116023

出　　处：《通信学报》2019年第11期187-198,共12页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61472171,No.61701212);中国博士后科学基金资助项目(No.2018T110220);辽宁省教育厅科学研究经费基金资助项目项目(重点攻关)(No.LZ2019001);辽宁省自然科学基金资助项目(No.2019-ZD-0468)

摘　　要：基于目前绝大多数数字音频水印方案仅仅能够对抗简单的常规信号处理,尚无法有效抵抗破坏性较强的局部去同步攻击,提出了一种基于稳健特征点的平稳小波域数字音频水印算法。首先利用高斯滤波技术计算出平稳小波域低频子带的一阶平滑梯度响应并确定基准阈值,进而提取出分布均匀且性能稳定的音频特征点;然后结合短时能量自适应确定适合于水印嵌入的局部特征音频段;最后利用扩展抖动调制方法将水印信息嵌入局部特征音频段中。仿真实验结果证明,所提算法具有较好的不可感知性,并且对常规信号处理(MP3压缩等)和去同步攻击(音调伸缩等)均具有较好的稳健性。利用描述能力强且性能稳定的平滑梯度刻画局部数字音频性质,提出一种基于平滑梯度的平稳小波域音频特征点提取方法,有效解决音频特征点稳定性差且分布极不均匀的缺点,提高了数字音频水印对幅度伸缩、局部变调、随机剪切等去同步攻击的抵抗能力。Aiming at the challenging work to design a robust digital audio watermarking algorithm against desynchronization attacks, a new second generation digital audio watermarking in stationary wavelet transform(SWT) domain based on robust local audio feature was proposed. First, the first-order smooth gradient response of the low-pass sub-band coefficient was calculated using Gaussian filter. Then, the short-term energy was utilized to adaptively determine local feature audio segments for embedding. Finally, the watermark information was embedded into local feature audio segments with spread transform dither modulation. The experimental results show that the proposed approach has not only good transparency, but also has strong robustness against common audio processing such as MP3 compression and good robustness against the desynchronization attacks such as pitch-scale modification et al. A SWT domain audio feature point extraction method based on smooth gradient is proposed, which effectively solves the drawbacks of poor stability and uneven distribution of audio feature points, and improves the resistance of digital audio watermarks to amplitude-scale modification, pitch-scale modification, random cropping, and jittering attacks.

关 键 词：数字音频水印 去同步攻击 特征点 平滑梯度 平稳小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]