Adaptive digital watermarking algorithm based on blocking and SVD
Lu Lin · Jisuanji gongcheng yu sheji · 2011
To solve the single watermark intensity problem of traditional watermarking algorithm based on SVD(singular value decom-position),an adaptive digital watermarking algorithm based on blocking-SVD is proposed.The primitive image is divided into blocks in the DWT domain,eigenvalues based on the mean,variance and information entropy are calculated according to the wavelet blocks’ brightness and texture features,then the class selection method is used to select optimal watermark intensity of every image blocks.Experimental results show that the proposed algorithm gets over the Blocking Effect problem of traditional algorithm,and has a good transparence and robustness against attacks,such as JPEG compression,filtering,adding noise and other image processing.The methods’ performance is much better than the existing and similar watermark algorithms.