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电子学报  2006 

基于图像尺度空间的几何不变特征点提取算法

, PP. 2564-2568

Keywords: 特征点提取,Harris角点算子,尺度空间

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Abstract:

图像特征点的提取是实现抗几何攻击数字水印算法的重要步骤,所提取的特征点是否鲁棒,将直接影响抗几何攻击水印的鲁棒性.Harris-Laplace角点检测方法是一种多尺度抗几何攻击角点提取方法,但计算比较复杂.将Harris-Laplace角点检测方法进行改进,把直接分析图像局部灰度值的角点提取方法与图象尺度空间的思想相结合,并兼顾多尺度的不同权值,则既可以保证角点抵抗一般几何攻击的鲁棒性,又减少计算复杂度的,根据此思路提出了加权平均Harris-Laplace角点检测方法来提取特征点.实验结果表明,该算法提取的图像特征点不仅具有很好的抵抗图像裁剪、几何缩放能力,而且计算复杂度明显低于相同重复检测率的Harris-Laplace角点检测算法.

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