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Geometric Camera Calibration Using Circular Control Points
October 2000 (vol. 22 no. 10)
pp. 1066-1077

Abstract—Modern CCD cameras are usually capable of a spatial accuracy greater than 1/50 of the pixel size. However, such accuracy is not easily attained due to various error sources that can affect the image formation process. Current calibration methods typically assume that the observations are unbiased, the only error is the zero-mean independent and identically distributed random noise in the observed image coordinates, and the camera model completely explains the mapping between the 3D coordinates and the image coordinates. In general, these conditions are not met, causing the calibration results to be less accurate than expected. In this paper, a calibration procedure for precise 3D computer vision applications is described. It introduces bias correction for circular control points and a nonrecursive method for reversing the distortion model. The accuracy analysis is presented and the error sources that can reduce the theoretical accuracy are discussed. The tests with synthetic images indicate improvements in the calibration results in limited error conditions. In real images, the suppression of external error sources becomes a prerequisite for successful calibration.

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Index Terms:
Camera model, lens distortion, reverse distortion model, calibration procedure, bias correction, calibration accuracy.
Citation:
Janne Heikkilä, "Geometric Camera Calibration Using Circular Control Points," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 22, no. 10, pp. 1066-1077, Oct. 2000, doi:10.1109/34.879788
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