Dual watermarking algorithm of colored images based on WPT and DCT
Wang Xiang-tin · Microcomputer Information · 2010
A dual watermarking algorithm for colored images based on wavelet packet transform (WPT) and discrete cosine transform is proposed in this paper.Convert the color image from RGB space model image into YCbCr space model image first,then the luminance component Y is chosen and decomposed by three wavelet packet transform.Different sub-band using different embedding algorithm Combination of visual characteristics.Theoretical analysis and experiment results show that the watermark generated with the proposed algorithm is imperceptible and of great robustness.