New gray image watermarking algorithm based on LWT and SVD
Min Zhang · Computer Engineering and Applications Journal · 2010
The original image is divided into many blocks.Then the middle-high sub-bands of two-level LWT with each block are implemented with LWT,and SVD is applied to the selected sub-band,the new matrix is constructed by singular values,which is divided into many blocks by rule,and decomposing with SVD again.Through twice partition blocks,twice LWT and the use of quartic SVD,the matrix will re-allocation and combination for extraction's singular value,and finally the watermarking image with Arnold scramble is embedded into the matrix.Experimental results show that the proposed method increases embedded capacity,and has a good transparence and robustness against attacks for common image processing.