Algorithm of Robust Image Watermark Based on DWT Direction Tree Structure
LU Zheng-ding · Jisuanji gongcheng · 2007
In wanelet transformation domain,there are lots of semblances among wanelet coefficients at the same direction subbands and spatial location,but different resolutions.This paper proposes an algorithm of robust image watermark based on DWT direction tree structure.The algorithm establishes the model by using support vector machine,hides watermark by adjusting the relation between output and target value of the model.The watermark recovery does not require the original image.Experimental results show that the algorithm possesses good robustness for common image attack,and has lager capacity,better invisibility,better security and super performance.