基于A3航摄仪的小基高比影像连接点精提取技术研究

Fine extraction of small base-to-height image connection points based on A3 aerial camera

利用A3航摄仪进行面阵摆扫影像高精度连接点提取,采用基于SIFT算子的匹配算法对A3面阵摆扫影像进行匹配处理,实现了A3影像间连接点初步提取。对存在的误匹配点,提出了一种正态分布模型和设定高程阈值相结合的剔除算法NDM-ET,设计了一种冗余连接点剔除方法。试验结果表明:在保证连接点数量和均匀分布的前提下,该方法可以大幅减少连接点的数量,提高匹配效率与精度。

The A3 aerial camera was used to extract the high-precision connection points of the area scan image,and the matching algorithm based on the SIFT operator was used to match the A3 area scan image to achieve the preliminary extraction of the connection points between the A3 images.For the existing mismatched points,a removal algorithm NDM-ET,which combines a normal distribution model and a set elevation threshold,is proposed,and a redundant connection point removal method is designed.Experimental results show that this method can greatly reduce the number of connection points and improve matching efficiency and accuracy under the premise of ensuring the number and uniform distribution of connection points.