COLOUR SPACES EFFECTS ON JOINT DCT-DWT BASED DIGITAL IMAGE

摘要

The aim of this work is to provide a digital watermarking technique using joint DCT-DWT algorithm which have always been realized in RGB colour space. In this study, a secure DCT-DWT based image watermarking technique is proposed and tested in seven colour spaces viz. RGB, HSV, HIS, YCbCr, YUV, YIQ and CIELab to determine which colour space is more effective in watermarking algorithms. In the proposed scheme, a watermark image is embedded into original cover image which is been wavelet decomposed followed by block based DCT of intended colour space. The experimental results shows that the proposed approach is oblivious and can successfully recover cover image with acceptable visual quality.