Authors: Priyanka Singh Balasubramanian Raman
Publish Date: 2016/10/28
Volume: 76, Issue: 20, Pages: 21497-21517
Abstract
A novel secured robust blind watermarking scheme has been proposed in this paper It exploits the human visual system HVS insensitivity to detect color changes as compared to brightness changes for embedding of watermark The color space is converted from RGB to YCbCr and one of its components is chosen arbitrarily for hiding copyright information The scheme is made very secured by Arnold chaotic maps and usage of multiple secret keys Three diagonal pairs of discrete cosine transform coefficients are chosen in each sampled block of the color channel and a threshold criteria based embedding is done in each pair corresponding to a single bit of the encoded copyright information To handle various image processing attacks and enhance robustness of the scheme extraction of the watermark bits is done based on majority voting concept using two separate counters for representing watermark bits The efficacy of the proposed scheme has been tested against variety of image processing and geometrical attacks and evaluated using peak signal to noise ratio PSNR structural similarity index matrix SSIM and normalized cross correlation NCC metrics Comparative results based on different aspects of robust watermarking scheme is also presented to build the appropriateness of the proposed scheme over existing state of art approaches
Keywords: