Abstract
This paper presents a different idea that a watermarking scheme can be considered as a weak signal detection in strong noise, while the protected digital work is viewed as noise. Based on detection method of weak square signal in strong noise with a chaotic oscillator, a public-key robust watermarking scheme is proposed. This scheme can show all details except the private key. After the watermarking scheme is described, the model feasibility experiment and anti-attack ability experiments are made and discussed. Experimental and discussion results show that the scheme is robust enough against attacks of the commonly used image processing methods. Also, experimental results show that the algorithm is robust to malicious attacks.
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