Blind watermarking scheme based on remainder of distance vector of wavelet coefficients

This paper introduces a blind watermarking scheme based on remainder of distance vector between two wavelet blocks. In the proposed scheme, the wavelet coefficients from frequency sub-band LH3 and HL3 have been grouped into two blocks for invisible watermark embedding and extraction. In the next stage, the distance vectors between two blocks are computed and then remainder after division calculated. For embedding 0 and 1 bit, the remainder of distance vectors fixed up to specific values. By increasing divisor, it is possible to embed watermark bits in the host image with more energy; however, this will lead to PSNR reduction. The proposed method, takes advantage of considerable robustness against prevalent attacks and another profit have wide range trade off between watermark embedding energy and the quality of watermarked image with select suitable value of divisor. The experimental results show that the proposed algorithm is robust against image processing attacks and also the comparison analysis indicates that has better performance than the other blind watermarking methods.