摘要
为了将铅垂线应用于城区空中三角测量,通过对大比例尺航空影像中铅垂线特点的分析,提出了一种有效的铅垂线提取算法,即首先对航空影像进行必要的预处理并自动提取直线,然后使用累积法从提取直线中分离出铅垂线并确定像底点坐标,最后应用共点约束的最小二乘直线模板匹配算法进一步提高铅垂线的提取精度及像底点的交会精度。
In order to utilize the vertical lines into the application of aerial triangulation over urban areas, an effective auto extracting vertical lines arithmetic has been presented in the paper. The arithmetic pre-process the aerial images at first, and then through an accumulation space to extract the vertical lines from the auto-extracted lines and calculate the approximate nadir point position at the same time, at last a least square template matching with nadir constraints has been used to improve the accuracy of the vertical lines and the intersection accuracy of the nadir point.
出处
《地理空间信息》
2009年第5期142-145,共4页
Geospatial Information
基金
国家自然科学基金资助项目(40371099)
关键词
铅垂线
灭点
直线提取
最小二乘模板匹配
vertical lines
nadir point
auto extracting
least square template match
