DocumentCode :
3309508
Title :
Accurate internal camera calibration using rotation, with analysis of sources of error
Author :
Stein, G.P.
Author_Institution :
Artificial Intelligence Lab., MIT, Cambridge, MA, USA
fYear :
1995
fDate :
20-23 Jun 1995
Firstpage :
230
Lastpage :
236
Abstract :
Describes a simple and accurate method for internal camera calibration based on tracking image features through a sequence of images while the camera undergoes pure rotation. A special calibration object is not required and the method can therefore be used both for laboratory calibration and for self calibration in autonomous robots. Experimental results with real images show that focal length and aspect ratio can be found to within 0.15 percent, and lens distortion error can be reduced to a fraction of a pixel. The location of the principal point and the location of the center of radial distortion can each be found to within a few pixels. We perform a simple analysis to show to what extent the various technical details affect the accuracy of the results. We show that having pure rotation is important if the features are derived from objects close to the camera. In the basic method accurate angle measurement is important. The need to accurately measure the angles can be eliminated by rotating the camera through a complete circle while taking an overlapping sequence of images and using the constraint that the sum of the angles must equal 960 degrees
Keywords :
calibration; cameras; error analysis; image processing equipment; image sequences; robot vision; rotation; tracking; accurate internal camera calibration; aspect ratio; autonomous robots; error source analysis; focal length; image feature tracking; image sequence; laboratory calibration; lens distortion error; principal point location; radial distortion centre location; real images; rotation; self calibration; Artificial intelligence; Calibration; Error analysis; Image analysis; Image sequence analysis; Laboratories; Lenses; Robot kinematics; Robot vision systems; Smart cameras;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Vision, 1995. Proceedings., Fifth International Conference on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-8186-7042-8
Type :
conf
DOI :
10.1109/ICCV.1995.466781
Filename :
466781
Link To Document :
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