title: Radial lens distortion correction with sub-pixel accuracy for X-ray micro-tomography.
abstract: 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.
authors.forename: Nghia T
authors.initials: NT
authors.lastname: Vo
authors.forename: Robert C
authors.initials: RC
authors.lastname: Atwood
authors.forename: Michael
authors.initials: M
authors.lastname: Drakopoulos