Blind Watermarking Algorithm for Single Channel Images Based on DWT-SVD and Arnold
LI Lin-jin · Computer and Digital Engineering · 2015
In order to improve the performance of digital watermarking system,a watermarking algorithm was proposed for signal channel image based on the combination of discrete wavelet transform,singular value decomposition and Arnold.Firstly,digital watermarking was pretreated by Arnold.secondly,to make two-level wavelet decomposition for the single channel image,the low frequency sub-band LL2 was divided into 4*4blocks,for each block singular value decomposition,according to the two value watermark scrambling,each of the largest singular value was selected by quantifying the watermark information embedding method.It did need the original image when the watermarking was extracted,so it could be applied in the practice easily.Simulation results showed that the watermarking algorithm has good invisibility and robustness to common attacks and geometric attacks.