Watermark Algorithm Based on SVD and Geometrical Correction
Tao Zhang · Jisuanji gongcheng · 2010
In order to improve the performance against attack of watermark algorithm,this paper presents a robust watermark algorithm based on Singular Value Decomposition(SVD) and geometrical correction.Watermark bits are embedded in first singular value of each block through quantization,the optimization of quantization step is acquired by genetic algorithm.While extracting watermark,Directe Fouriet Transformer(DFT) and geometrical invariant moment are introduced to estimate geometrical transform and rectify test image.Experimental results show the algorithm is robust to resist normal and geometrical attack.