一种用于内容完整性保护的脆弱数字音频水印算法

New Fragile Digital Audio Watermarking Algorithm for Authentication

提出了一种用于内容完整性保护的脆弱数字音频水印算法 ,该算法首先将视觉可辨的二值水印图像降维成一维水印序列并对其进行随机置乱 ,再从原始数字音频信号中随机选取采样数据并进行快速傅立叶变换 (FFT) ,最后结合人类听觉系统 (H AS)计算可感知噪声阈值 JN D(Just Noticeable Distortion,或称为临界可见失真 ) ,并依此选取FFT系数通过量化处理嵌入水印信息 .该算法提取水印信息时不需要原始数字音频信号 .仿真结果表明 :该脆弱音频水印算法不仅具有较好的透明性 ,而且对诸如叠加噪声、有损压缩、低通滤波、重新采样。

Presented a new fragile digital audio watermarking algorithm for authentication is. Firstly,the visually recognizable binary watermark image was converted into the one-dimensional sequence,and the sequence was permuted pseudo-randomly. Then some digital audio samples werd selected randomly and decomposed by Fast Fourier Transform. Finally,the significant FFT coefficients werd selected according to their JND(Just Noticeable Distortion),and the watermarking signal was embedded into the selected FFT coefficients by quantization process. The proposed algorithm can extract the watermark without the help from the original digital audio signal. Experimental results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as noising adding,lossy compression,low pass filtering,re-sampling,and re-quantifying.