A new robust watermarking scheme for color images

In this paper, a novel watermarking scheme for color images is proposed. The host image is transformed from RGB color space to YCbCr color space. First discrete cosine transform is applied on all the components of the image and then all the transformed components are further decomposed by l-level wavelet packet transform. A gray scale watermark is embedded in all the frequency sub-bands of the image. A reliable extraction scheme is developed for the extraction of the watermark from the distorted images. Experimental results show that the proposed watermarking algorithm provides good results in terms of imperceptibility and is also robust against variety of attacks.