Open AccessRadial lens distortion correction with sub-pixel accuracy for X-ray micro-tomography
Author(s) -
Nghia T. Vo,
Robert C. Atwood,
Michael Drakopoulos
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.032859
Subject(s) - distortion (music) , optics , calibration , pixel , lens (geology) , tomography , image resolution , computer science , beamline , physics , computer vision , beam (structure) , telecommunications , amplifier , bandwidth (computing) , quantum mechanics
Distortion correction or camera calibration for an imaging system which is highly configurable and requires frequent disassembly for maintenance or replacement of parts needs a speedy method for recalibration. Here we present direct techniques for calculating distortion parameters of a non-linear model based on the correct determination of the center of distortion. These techniques are fast, very easy to implement, and accurate at sub-pixel level. The implementation at the X-ray tomography system of the I12 beamline, Diamond Light Source, which strictly requires sub-pixel accuracy, shows excellent performance in the calibration image and in the reconstructed images.