Digital watermarking based on stochastic resonance signal processor

Authors:
Shuifa Sun;Sam Kwong;Bangjun Lei;Sheng Zheng
Affiliations:
College of Elect. Eng. and Inf. Techn., China Three Gorges Univ., Yichang, China and Dept. of Comp. Sci, City Univ. of Hong Kong, Kowloon, Hong Kong SAR, P.R. China and Inst. of Int. Vision and Im ...;Department of Computer Science, City University of Hong Kong, Kowloon, Hong Kong SAR, P.R. China;Institute of Intelligent Vision and Image Information, China Three Gorges University, Yichang, China;College of Electrical Engineering and Information Technology, China Three Gorges University, Yichang, China and Institute of Intelligent Vision and Image Information, China Three Gorges University ...
Venue:
PCM'07 Proceedings of the multimedia 8th Pacific Rim conference on Advances in multimedia information processing
Year:
2007

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Abstract

A signal processor based on an bi-stable aperiodic stochastic resonance (ASR) is introduced firstly. The processor can detect the base-band binary pulse amplitude modulation (PAM) signal. A digital image watermarking algorithm in the discrete cosine transform (DCT) domain is implemented based on the processor. In this algorithm, the watermark and the DCT alternating current (ac) coefficients of the image are viewed as the input signal and the channel noise of the processor input, respectively. In conventional watermarking systems, it's difficult to explain why the detection bit error ratio (BER) of a watermarking system suffering from some kinds of attacks is lower than that of the system suffering from no attack. In the present watermarking algorithm, this phenomenon is systematically analyzed. It is shown that the DCT ac coefficients of the image as well as the noise imported by the attacks will cooperate within the bi-stable ASR system to improve the performance of the watermark detection.