A new approach to color image watermarking based on joint DWT-SVD domain in YIQ color space

摘要

The rapid acceleration in the growth of digitized media has made authentication and protection of digital data through watermarking vitally important. In this paper, we proposed a semi blind watermarking scheme utilizing both Discrete Wavelength Transform (DWT) and Singular Value Decomposition (SVD). To embed the watermark, we transformed the host image into wavelet domain and generated a secondary host image using directive contrast. By remodeling the SVD coefficients of the watermark with the SVD coefficients of secondary image we inserted the watermark into the secondary image. A genuine extraction scheme has also been developed to recover the watermark from the cover image. The scheme has been employed using horizontal sub band. In addition to, evaluations have been added in terms of vertical and diagonal sub bands to compare the performance of the algorithm on the basis of specific sub bands. Experimental evaluations in terms of Normalized Correlation (NC) and Peak Signal to Noise Ratio (PSNR) give proof that our procedure is durable and imperceptible under variety of attacks.