基于POS数据的核线影像生成方法  

A Method of Epipolar Image Generation Based on POS Data

作　　者：袁修孝[1] 吴珍丽[1] 

机构地区：[1]武汉大学遥感信息工程学院,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2008年第6期560-564,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40771176);国家创新研究群体科学基金资助项目(40721001)

摘　　要：提出一种对已知外方位元素的立体影像实施灰度重采样生成核线影像对的方法,推导了核线影像与原始影像之间的严密几何关系,并利用一组摄于某山区的1∶3000比例尺实际航空影像验证了所建立几何关系的正确性和方法的可行性。试验表明,利用光束法区域网平差和经检校后的POS影像外方位元素生成的核线影像对与基于常规相对定向方法所生成的核线影像对具有相同的质量,同名点的上下视差在1像元以内,完全可以满足摄影测量立体观测的要求;而采用未经检校的POS影像外方位元素所生成的同名核线影像对带有约70像元的上下视差,无法用于立体观测。This paper puts forward a method of generating epipolar images using the elements of exterior orientation on aerial stereo image pairs. Firstly, the strict geometry relation between the epipolar images and original stereo images is proposed; and then the feasibility and accuracy of the geometry relation is proved by the experiments using the actual aerial images at the 1 ： 3 000 scale. The empirical results indicate that the epipolar images generated using the elements of exterior orientation obtained by bundle block adjustment and calibrated POS da.ta can get the familiar quality compared with the method using elements of relative orientation and the vertical parallax of corresponding image points is within one pixel, which satisfies the demand for stereoscopic observation in photogrammetry, but the ones generated using the POS data uncalibrated has about 70 pixels vertical parallax, which can not be used for stereoscopic observation.

关 键 词：定位定向系统(POS) 核线影像 重采样 上下视差 

分 类 号：P231.5[天文地球—摄影测量与遥感]