标识点快速提取与高精度单点匹配式定位算法

Quick extracting of marking cross points and accurate locating algorithm by single-point-mode matching

在简要分析目前标识点自动提取技术难点的基础上，提出邻域灰度重心连线交点和累积量判断的“＋”交叉点快速探测与单点匹配式高精度定位算法。试验结果表明，算法能够很好地适应噪声环境、光照变化、图像旋转、采样误差、一定程度视角变化和透视变形等影响，达到0．01～0．05像素级的定位精度。

The key problems in current methods of automatic extracting of marking cross points are analyzed. Then, a quick detection of the cross points based on the intersection of the barycenters and the accumulation volume is proposed, and a accurate locating algorithm by single-point-mode matching is designed to ensure the accuracy. Experimental results show that the algorithm is robust to noise, rotation, resampling error, illumination variations, a certain degree of view variation and perspective distortion. The locating accuracy of 0.01 to 0.05 pixels is obtained.