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A Robust Semi-Blind Image Watermarking Technique

Day by day the increase in networked multimedia systems has created an urgent need for copyright enforcement technologies that can protect copyright ownership of multimedia contents. Digital Image Watermarking is one such technology that has been developed to protect digital images from illegal manipulations. Watermarking is used to To protect the ownership of content service provider is a crucial area of research. Robustness against geometric distortions is crucial issue in watermarking. In this paper, a new SVD-DWT semi-blind composite image watermarking algorithm that is robust against various attacks is presented. I used DWT and IDWT transform to obtain four different frequency images. Watermark is embedded in highfrequency band by SVD. The imperceptibility and robustness are the properties that are evaluated for the proposed scheme. Image is evaluated using peak-signal-to-noise ratio (PSNR) which is used to evaluate the difference between original image and the watermarked image.