Digital Color Image Watermarking using DWT-DCT Coefficients in RGB Planes

Abstract

Digital image watermarking is used to identify the authenticity and integrity and to show the identity of its owners This paper presents a more secure method for copy right protection In the proposed method the color image is decomposed into 3 color channels Red Green and Blue and then DWT and DCT are applied to B channel of the R G and B channels The colored Watermark image is decomposed into R G B channels and DCT is applied to all the channels separately R G B channels of watermark image are embedded into mid frequency coefficients of B channel already selected The performance of proposed algorithm is measured by using Mean Square Error Peak Signal to Noise Ratio Standardized Correlation and Normalized Correlation A comparative study of proposed scheme with the existing methods which uses DWT-DCT transforms is carried here and results shown