A DISCRETE COSINE TRANSFORM BASED WATERMARKING SCHEME FOR COLOR IMAGE USING YCbCr SPACE

In this paper, a non-blind color image watermarking scheme is proposed based on discrete cosine transform and YCbCr color space. The host image is converted from RGB space into YCbCr space and the Y component image is employed for embedding a binary watermark image. The strength of the watermark is controlled by a robustness factor to obtain an acceptable trade-off between robustness and imperceptibility. The performance of the proposed scheme is evaluated in term of Peak signal to noise ratio (PSNR) and normalized correlation (NC). The experimental results show that the proposed scheme is robust under various attacks like JPEG compression, filtering and noise addition.