近景摄影测量中圆形目标的投影偏心差及模拟分析

Projection eccentric error of round target in close-range photogrammetry and simulation analysis

圆形标志作为最常用的人工标志被广泛用于近景摄影测量之中,其成像一般为椭圆,在量测时通常以椭圆中心的影像坐标作为圆心的投影。实际上二者存在投影偏心差,本文推导了投影偏心差的计算公式,并以一个典型的近景摄影测量实例来模拟分析投影差的大小,以期为类似问题提供借鉴。

The round signs, the commonly used artificial signs, are widely used in close-range Photogrammetry, the formed images are generally ellipses, the image coordinates of ellipse center are usually used as the projection of center of a circle during survey. Actually the projection eccentric error exists between the centre of ellipse and the centre of cycle. The calculation formulae for the projection eccentric error was derived in this paper,and a typical close-range photogrammetric example was given to. simulate the projection error, which can provide reference for similar problems.