【摘要】 利用数字图像SIFT(scale invariant feature transform)特征的稳定性和小波变换的特性,提出了一种抗仿射变换和剪切的鲁棒水印算法。水印信息通过量化调制方法嵌在小波变换的低频域。水印检测时,利用匹配的SIFT关键点的位置信息计算仿射变换参数和边缘剪切参数,然后对被检测图像进行逆变换和重定位,恢复水印的同步信息。实验结果表明该算法可以抗击仿射变换和剪切攻击,对常见的图像处理也有很强的鲁棒性。更多还原

【Abstract】 This paper presented a robust image watermarking algorithm utilizing the stability of SIFT points and the features of DWT.The watermark was embedded in the low-frequency coefficients by quantization modulation.In watermark detecting it used the coordinates of the matched SIFT key-points to compute the parameters about affine transformations and border cropping,then revised the watermarked image alerted by affine transformation and border cropping.The experimental results show that the watermarking algorithm is robust against affine transformation,cropping as well as common image processing.更多还原