Watermarking algorithm of colored images based on CT-SVD transform
Feng Qiao · Microcomputer & its Applications · 2010
This paper introduced the color image digital watermarking which is implemented based on the multi-scale,multidirection of the contourlet transform and stability of singular value decomposition.The given RGB color image is split into its three components in the YUV color space first,then the luminance component Y is chosen and decomposed by Contourlet transform and get scale factors of different directions.In order to meet the watermark invisibility and robustness,make low-frequency coefficients decompose blocks by SVD,and embedding the watermark data by modifying values of the left singular matrix U.