ABSTRACT

A novel watermarking scheme for color images has been proposed using column DCT wavelet transform. To improve the robustness of watermarking scheme, compressed watermark with tolerable fidelity is embedded into host image. Middle frequency coefficients are selected for embedding watermark so that the proposed scheme can sustain attacks like lossy image compression where high frequency coefficients are eliminated from watermarked image. Performance of proposed scheme is evaluated against image resizing, varieties of cropping, compression and noise attacks like binary distributed and Gaussian distributed run length noise. Due to column transform instead of full transform, proposed scheme also gives computational efficiency.