POS数据辅助的航空影像变化检测方法研究

提出了一种利用机载定位定向系统(POS)数据辅助航空影像进行影像匹配和变化检测的方法。首先利用带POS数据的老影像解求新影像的外方位元素,然后在老立体影像上提取特征点,根据前方交会和共线条件方程得到新影像上同名点的近似位置,再与新影像进行匹配,寻找匹配不好的点作为变化区域的初始位置。以此为基础选择精检测窗口,进行边缘提取和跟踪,并进行链码匹配,最终确定发生变化的区域。试验证实,本文方法是可行的。

Change Detection Using Aerial Images with POS Data

A method of change detection using aerial images with POS data is presented.Firstly,the new images' orientation parameters are resolved using the old aerial images with POS data in the same area,and feature points are extracted in old images,and new images' conjugate points are computed using forward intersection and collinearity equations.Then gray matching are done with the conjugate points,and the points which can not match well are found.These points will be preliminary regarded as been changed,and based on them,check-up windows are selected for the next precise detection.Edge extraction and chain code trace are done in these windows,and the corresponding chain codes are matched.At last the change areas are obtained according to the matching results.Experiment proves that this method is feasible,and gets relatively encourage result.