A Secure & Invisible Image Watermarking Scheme Based on Wavelet Transform in HSI Color Space

Digital watermarking is an efficient technique to protect copyright and ownership of digital information. This paper, presents a novel digital image watermarking based on wavelet transform in HSI color space. Initially, the one level wavelet coeffiects are generated (LL, LH, HL, & HH) to the intensity component of HSI color space cover image. This LL coefficient and gray watermark image are undergoes 8*8 block processing. These each block entropies of both images are compared and scaled with a scaling factor ‘α’ (Embedding Process). Finally the watermarked image is inverse wavelet transform of above said embedded coeffiects. At the receiver the inverse process is carried to extract the watermark image. Experimental results show that, the proposed watermarking scheme is robust to noise attacks. Experimental results show an improvement over existing methods n terms of Peak Signal to Noise Ratio (PSNR) and Mean square error (MSE).