摄像机内参数误差对姿态测量精度的影响分析  

Effects of Camera Inner Parameter Error on Pose Measuring Precision

作　　者：曾涛 刘维璠 

机构地区：[1]中航飞机股份有限公司西安飞机分公司,西安710000 [2]中航飞机研发中心,西安710000

出　　处：《电光与控制》2016年第3期63-66,共4页Electronics Optics & Control

摘　　要：为了研究摄像机内参数误差对姿态测量精度的影响,将焦距、成像中心、畸变系数等参数作为蒙特卡罗方法的输入量,以姿态测量成功率度量了各个输入量对姿态测量精度的影响程度,并仿真统计了同一输入误差值在多个像面区域内产生的姿态测量误差值。仿真结果表明,随着特征点像点偏离像面中心,焦距误差对姿态测量结果的影响逐渐增大;成像中心误差对姿态测量结果的影响在整个像面区域内变化不明显;姿态测量误差随着像面区域畸变的增大而增大。因此,在姿态测量系统中,提高焦距与畸变系数的精度能有效改善像面边缘区域的姿态测量精度,而整个像面区域的姿态测量精度会随着成像中心误差的减小而提高。In order to investigate the influence of camera inner parameters to the measuring precision, the camera inner parameters such as focal length, imaging center and distortion coefficient were taken as input variables of the Monte Carlo Method（ MCM） , and success rates of pose determination was used to measure the influence degree of each input variable to the measuring precision. Statistics was made through simulation for the pose measuring errors caused by the same input error in multiple image surfaces. The simulation result shows that： 1） The impact of focus error on measuring precision increases as the imaging point of target feature deviates from the imaging center; 2） The impact of the imaging center error on the measuring precision has no obvious change in the whole image surface; and 3） The error of pose measuring increases with the distortion of image regions. Therefore, improving the precision of focal length and distortion coefficient would increase the pose measuring precision of outer imaging regions, while the measuring precision in the entire imaging surface region would be increased by decreasing the imaging center error.

关 键 词：姿态测量 摄像机内参数 蒙特卡罗 测量精度 

分 类 号：TB853.19[一般工业技术—摄影技术]