Abstract: To choose matching points for an object in stereo images is a key technique in disparity location and can influence precision of 3D location badly.Aiming at flaw location based on radiography，a kind of corresponding choosing technique based energy center matching is proposed.The influence of miss-matching on location precision is discussed firstly.Then the technique in the paper is compared with the common stereo location techniques.The experimental results show that the methods，which choose edge points or shape centers as corresponding points，can introduce biggish location error，but the technique brought forward in the paper can improve location precision greatly.

Key words: 3D localization, binocular vision, stereo matching, energy centre

摘要：

在基于双目视觉的立体定位技术中，匹配对应点的选取非常关键，会直接影响到目标定位的精度。针对X射线成像检测中的缺陷定位问题，提出了一种基于能量中心匹配的对应点选取方法。首先讨论了误匹配对定位精度的影响，然后通过实例将一般定位方法与该方法进行了比较。实验表明：常用的基于边缘匹配或形状中心匹配寻找对应点的定位方法存在很大误差，而该技术则能达到很高的定位精度。

关键词: 立体定位, 双目视觉, 立体匹配, 能量中心