Adaptive Colour Space based Robust Image Watermarking Using Serial DWT-HD-SVD domain

Watermarking is used for the authentication and protection of digital image data. The color image watermarking is a challenging task and may endup to be lengthy. Various transformations based methods are used forenhacingwatermarkrobustnessand to keep itinvisible. Robustness of watermarking methods have been improved using the hybrid DWT-SVD domain. In this paper an improved hybrid transformation method is prpoposed, using the combination of the Hesenberg Decomposition (HD) with the existing DWT-SVD method. The LAB colour space is adopted at the pre-processing stage for the entropy maximization. The entropy analysis is used for justification of the colour space adaptation.Performance of the existing and proposed method is tested on colour images using parametric analysis of normalized correlation (NC),Peak signal to noise ration (PSNR) and SSIM.Efficiency of existing waatermarking methods may detoriate undervarious attacks. The Impact of the various watermark attacks are also evaluated over the extraction quality.