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《Infrared and Laser Engineering》 2011-07
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Calculation exact center coordinate of a target circle in camera calibration

Xu Peng1,2,Wang Jianye1,Wang Yanru1(1.Key Laboratory of Atmospheric Composition and Optical Radiation,Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230032,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
Camera calibration is a key problem for machine vision.When the target characteristic points coordinates in world coordinates system are confirmed,the internal and external parameters are calculated and the camera calibration is implemented.In order to simplify the algorithms and improve the accuracy of the calculation,an algorithm based on the invariants of projection for calculating coordinates of suppositional centers was presented.This algorithm is to use computer visual search to get all common tangents of three ellipses images of corresponding circular target whose centers were not on one beeline.The intersection of two beelines determined by two pairs of tangency points on one ellipse was just the center of the corresponding circle on the target image.The practicability of this algorithm is illustrated by the simulation experiment.The result shows that this algorithm has no model error,and the numerical procedure is simplified.The calculating precision of the target characteristic points coordinates has thus been improved,and the camera calibration will be more accurate.
【Fund】: 国家863计划(2006AA861062)
【CateGory Index】: TP391.41
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