Gray image watermarking algorithm base on LWT and SVD
基于提升小波和奇异值分解的灰度水印算法*

This paper proposed a gray image watermark algorithm based on LWT and SVD.Firstly,divided the original image into many blocks.Then implemented the middle-high frequency of two-level LWT with each block by LWT,and applied SVD to the selected sub-frequency,divided the new matrix constructed with singular values into many blocks by rule,which were decomposed with SVD again.Through twice partition blocks,twice LWT and the use of quartic SVD,the matrix would re-allocation and combination for extraction's singula...