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Watermarking Scheme for Color Image Authentication

Digital watermarking is the technique for embedding information into a digital signal. The watermarking technique provides a persistent link between the authenticator and the content it authenticates. The digital image watermarking can be categorized into different category-Visible and Invisible as well as Fragile, Semi-fragile and Robust. In this kind of watermarking the information is added as digital data to the original, but it cannot be perceived in Human Visual System (HVS). Image authentication has achieved a sharp attention now a day due to broad availability of Internet services. Mal distribution and illegal copying of image, volatiles the authenticity of image ownership. The proposed technique will ensure the complete authentication of ownership in a dynamic manner. The proposed technique forms the watermark from the host image itself by combining the unique zone of the host image, and then it is embedded to the host image with LSB scheme. It allows a user with an appropriate secret key and a hash function to verify the authenticity, integrity and ownership of an image. If a forger performs the watermark extraction with an incorrect key and inappropriate hash function, the user obtains an image that resembles noise. This provides integrated solution for ownership authentication where the watermark is unique for that particular host image, thus the authentication is ensured in an efficient way. At the watermark extraction end, blind extraction method is used, i.e., neither the host image nor the watermark image is required at the time of watermark extraction. The PSNR is a measure of quality of watermarked image. PSNR is provided only to give us a rough approximation of the quality of the watermark for different color images.