A DCT-domain system for robust image watermarking
Signal Processing
Digital watermarking
On the use of stochastic resonance in sine detection
Signal Processing
Noise-enhanced nonlinear detector to improve signal detection in non-Gaussian noise
Signal Processing - Special section: Distributed source coding
Spatial domain digital watermarking of multimedia objects for buyer authentication
IEEE Transactions on Multimedia
Digital rights management and watermarking of multimedia content for m-commerce applications
IEEE Communications Magazine
Secure spread spectrum watermarking for multimedia
IEEE Transactions on Image Processing
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In this paper, an aperiodic stochastic resonance (ASR) signal processor for communication systems based on a bistable dynamic mechanism is proposed for detecting base-band binary pulse amplitude modulation (PAM) signals in communication systems. All parameters in the processor can be adjusted when needed. The adjustment mechanism is explained from the perspective of the conventional noise-induced nonlinear signal processing. To demonstrate this processor's usability, a digital image-watermarking algorithm in the discrete cosine transform (DCT) domain is implemented. 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, respectively. In conventional watermarking systems, it is difficult to explain why the detection bit error ratio (BER) of a watermarking system suffering from certain attacks is lower than that of the system not suffering from any attack. In the new watermarking algorithm, this phenomenon is systematically analyzed. It is shown that the DCT ac coefficients of an image as well as the noise imposed by the attacks can cooperate within the bistable system to improve the performance of the watermark detection.