Collusion Attack Resistant Watermarking Scheme for Colored Images using DCT
Vikas Saxena, Juhi Gupta · IAENG international journal of computer science · 2007
Image watermarking with both insensible detection and high robustness capabilities is still a challenging problem for copyright protection up to now. This paper presents a new scheme for hiding a logo-based watermark in colored still image which is inherently collusion attack resistant. This scheme is based on averaging of middle frequency coefficients of block Discrete Cosine Transform (DCT) coefficients of an image. It is different from earlier schemes based on middle frequency coefficient by mean of high redundancy, to sustain malicious attacks. Experimental results show the robustness of the proposed scheme against the JPEG compression and other common image manipulations.