基于循环码的LWT-DCT半脆弱音频水印算法

Semi-fragile Audio Watermarking Algorithm Based on Cyclic Codes in LWT-DCT

为增强音频水印的实用性,提出一种新的半脆弱音频水印算法。算法应用多次混沌加密,确保水印安全可靠;充分利用提升小波分解特性与DCT变换特性,选择系数并自适应量化嵌入水印,保证水印的稳定性;把数字音频水印技术看作信道抗干扰的通信过程,引入循环编码纠正由各种信号干扰引起的错误,进一步提升水印的鲁棒性。实验结果表明,该算法的水印安全性较高,对一般音频信号处理鲁棒性较强,对恶意篡改的定位与提示准确性较高。

In order to enhance the practicability of audio watermarking, a new semi fragile audio watermarking embedded in selected coefficient with adaptive quantization to ensure the stability of the watermark. In addi tion, the algorithm regarded the digital audio watermarking techniques as anti jamming communication process of the channel, introduced cyclic coding to correct the errors caused by all kinds of jamming signals and further enhanced the robustness of the watermark. The experimental results show that the watermarking algorithm has high security, good robustness in normal audio signal processing and high accuracy for locating and alerting of the malicious tamper.