基于IGG3的数字工业摄影测量抗差光束法平差

数字工业摄影测量中,相机拍摄的不同相片得到的像点坐标被视为等精度观测值,其权值被定为单位权进行平差计算。自检校光束法平差能够有效的补偿系统误差,但测量过程中仍然不可避免地存在粗差和随机误差。为了进一步提高数字工业摄影测量平差计算结果的精度,结合抗差估计具有"充分利用有效信息,限制利用有用信息,排除有害信息"的特点,对自检校光束法平差方法进行改进,提出了一种基于IGG3的抗差光束法平差方法;并进行公共点转换实验和重复测量实验来评价其外符合精度和内符合精度。实验结果表明改进后的方法比原方法计算所得的结果精度更高。

Robust Bundle Adjustment of Digital Industrial Photogrammetry Based on IGG3

In digital industrial photogrammetry, the image point coordinates obtained from the different photos taken by the camera are regarded as the observations of the equal precision. The weights of the observations are defined as the unit weights in the adjustment process. The self-calibration bundle adjustment method can effectively com-pensate system error, but there are still inevitable errors and random errors in the measurement process. In order to further improve the accuracy of the calculation results of digital industrial photogrammetry adjustment, taking into account the robust estimation with making full use of effective information, restricting the use of useful information and eliminating harmful information, the self-calibration bundle adjustment method is modified and a new method based on IGG3 is proposed in this paper. The common point conversion experiment and repeated measurement ex-periment are carried out to evaluate the inside precision and outside precision. The experimental results show that the modified method is more accurate than the original method.