移动测量系统宽幅影像的几何拼接与量测

Wide Image Mosaic and Measure Algorithm of MMS

研究了移动测量系统宽幅影像的拼接与量测算法。通过建立三幅影像柱面全景投影的几何关系,能够直接拼接完成宽幅影像。利用宽幅影像和原始影像间反投影变换关系以及三幅原始影像的同、异步立体像对,可建立宽幅影像与物方空间坐标间一一对应关系,从而实现宽幅影像目标的量测算法。宽幅影像的投影拼接和量测实验表明,利用柱面全景投影拼接得到宽幅影像的方法可应用于移动测量平台宽幅影像序列的拼接;在原始影像具备同步立体像对的条件下,宽幅影像量测的绝对精度可达1 m以内,相对精度可达0.2 m以内,满足城市环境实景目标量测的精度需求。

A wide image mosaic and measure algorithm of MMS has been proposed in this paper. Through constructing the cylinder panorama projection relationship of three images, the wide image has been mosaiced directly. The corresponding relationship between wide image and object spatial coordinate has been constructed by utilizing back-projection relationship between wide image and original image, and synchro or asynchronous stereo images of three original images. Then, the wide image object measure algorithm has been realized. The wide image experiment illustrates that, the method of utilizing cylinder panorama projection to acquire wide image can be applied in mosaic of wide image sequence in MMS. When original image is qualified with synchro stereo image pair, the absolute precision of wide image measure result can be better than 1 m and the relative precision of wide image measure result can be better than 0.2 m, which can meet the precision requirement of object measure in city real vision enviorment.