Correcting lens distortion

Details Correcting lens distortion Correcting lens distortion

1998-07-06

1999-12-14

Epps, Georgia

Optical: systems and elements

Lens

382254, G02B 300

Patent

active

060025255

ABSTRACT:
Lens distortion may be corrected using a least squares curve fitting method to determine a straight line approximation for the curvature caused by lens distortion. An image made of a rectangular shape formed from a series of circles may be utilized as the target for a picture which may be taken to calibrate for lens distortion. The deviation of each of the straight lines caused by the lens distortion can be calculated assuming that the optical axis is centered on the image. The presumed optical axis can be adjusted towards the sides of the rectangle with the lower values of distortion coefficient. When the lines agree the optical axis has been located. The deviation is measured perpendicularly from a best fit straight line approximation.

REFERENCES:
patent: 4298944 (1981-11-01), Stoub et al.
patent: 5878174 (1999-03-01), Stewart et al.

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