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Noise-like waveform and strange attractor are considered as important characteristics of chaos. In this paper, a new chaotic system with a novel attractor looking like limit cycle, which generates a sine-like output waveform, is found. The existence of chaotic signal with sine-like waveform is further investigated by employing several numerical tools and verified by simulating an experimental circuit.
In this paper, a new semi-fragile watermarking scheme based on nonsubsampled contourlet transform (NSCT) for color image authentication is proposed, in which the watermarking is embedded in the SVs (singular values)of the blocks within NSCT subbands by an adaptive quantized method. The eye is insensitive to the blue color so the transform is used in the blue segment of the color image. NSCT is a redundant...
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