A Novel Robust Color Image Digital Watermarking Algorithm Based on Discrete Cosine Transform
Taiyue Wang, Hongwei Li · Journal of Computers · 2013
Digital watermarking technology is a very good method for protecting copyright. In this paper, in terms of requisition of imperceptibility and robustness of watermarking, the coefficient features of Discrete Cosine Transform (DCT) are introduced and a new image watermarking scheme based on DCT is proposed. Digital watermark is embedded in original image by subtle perturbations of DCT corresponding coefficients. Experimental results show that the proposed watermarking scheme is feasible and simple, the embedded watermarking images have little difference with the original images and the extracted watermark is accurate. Moreover, it is imperceptible and robust against various signals processing such as noise adding, cropping, rotating and sharp, etc.