一种基于PQT和扫描模式的图像水印算法

An Image Watermarking Algorithm Based on PQT and SCAN Patterns

提出一种基于四叉树(Pattern QuadTree,PQT)和扫描模式的二值图像加密算法,利用遗传算法(Genetic Algorithm,GA)优化嵌入强度λ来提高鲁棒性。在原始图像中引入两级离散小波变换(Discrete Wavelet Transformation,DWT),然后选择LL2子带嵌入水印。每个子带分为多个8×8区块,并在每个区块上应用奇异值分解(Singular Value Decomposition,SVD)。实验结果表明,该算法对多种攻击都有很好的效果。

This paper propose an binary image encryption algorithm based on Pattern QuadTree(PQT)and SCAN patterns to process watermarking.We use Genetic Algorithm(GA)to optimize the embedding strength to improve robustness.Two levels Discrete Wavelet Transformation(DWT)is applied to the cover image and then choose LL2 sub band to embed watermark.The band is divided into many 8*8 blocks and applied Singular Value Decomposition(SVD)on every block.The experimental results show that the algorithm has a good effect on many attracks.