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1 Opto-Electronics Review

1 2007

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Homography of central points for optical distortion compensation

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Nowakowski A. , Skarbek W.

Opto-Electronics Review

2007

tom Vol. 15, No. 4

202-209

The paper presents a novel radial lens distortion modelling method for vision systems. It is based on single images of chessboard planar pattern, in which calibration points (corners of chessboard squares) are localised. The points, which are situated near the image centre, where the distortion is negligible, are used to determine undistorted grid of calibration points, by parameters of radial model by the linear least square method. Having the distortion model, the dense compensation is performed with support of bilinear interpolation and a sparse compensation by Newton iterative scheme providing subpixel accuracy.