Reversible Watermarking on Stereo Audio Signals by Exploring Inter-Channel Correlation

Yuanxin Wu, CAS Key Laboratory of Electro-magnetic Space Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei, China Wen Diao, CAS Key Laboratory of Electro-magnetic Space Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei, China Dongdong Hou, CAS Key Laboratory of Electro-magnetic Space Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei, China Weiming Zhang, CAS Key Laboratory of Electro-magnetic Space Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei, China ABSTRACT A new reversible watermarking algorithm on stereo audio signals is proposed in this paper. By utilizing correlations between two channels of audio signal, we segment one channel based on another one according to the smoothness. For each segmented subhost sequence, we estimate its capacity and the corresponding embedding distortion firstly, and then select the optimal combinations of sub-host sequences for embedding. Experimental results indicate that the proposed algorithm can improve SNR (signal to noise ratio) for various kinds of capacity.

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