A Dual Color Image Watermarking Scheme Based on non-overlapping Blocks with Circulation

Abstract

Digital watermarking is a method for protecting copyrighted materials such as digital images. This paper introduces a new color watermarking scheme based on non-overlapping Singular Value Decomposition (SVD) with circulation. First, dual color host image and watermark are decomposed into R, G and B components, respectively. Scrambling the three components of watermark by Arnold chaotic map and divided them into b × b non-overlapping blocks, respectively. The three components of original image are divided into equally-size and non-overlapping blocks. Second, performing an SVD transformation on all of blocks, the singular values (SVs) of each watermarking block are added to each SVs of original same color block separately with circulation. Extracting any consecutive b rows and b columns of watermarked image blocks can get complete watermark information. Experimental results show the proposed scheme can effectively resist large degree of geometric attacks and compound attacks, and it is also strongly robust against common image processing attacks.