摘要
针对传统音频水印算法不能实现盲提取和水印的安全性、鲁棒性不强,提出一种改进算法。采用Logistic混沌序列对降维后的水印信号作进行调制,再结合离散小波变换的多层分辨能力和离散余弦变换的能量汇聚特性,通过修改双变换域的中低频系数,在载体音频中嵌入水印信息。仿真实验表明改进算法具有更好的安全性和鲁棒性。
An improved algorithm is proposed directing against the non-blind extraction of the traditional audio watermarking and watermark's weak security and robustness. Using Logistic chaotic sequence to modulate the watermark signal after reducing the dimensionality,Combining with the multi-resolution capabilities of discrete wavelet transform and the energy-gathered features of discrete cosine transform, watermark information is embedded in the audio carrier by modifying the intermediate or low frequency coefficient in dual-transform-domain. The simulation results show that improved algorithm owns better safety and robustness performance.
出处
《电脑知识与技术（过刊）》
2014年第3X期1783-1786,共4页
Computer Knowledge and Technology
关键词
音频水印
离散小波变换
离散余弦变换
混沌调制
双变换域
audio watermarking
discrete wavelet transform
discrete cosine transform
chaotic-modulation
dual-transform-do-main
