TOF Range-Imaging Cameras by Fabio Remondino & David Stoppa

Author:Fabio Remondino & David Stoppa
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

(8)

where k1, k2, k3 are the radial lens distortion model coefficients and

(9)

The correction terms for the image point co-ordinates are easily derived from similar triangle relationships

(10)

(11)

Often only one or two coefficients are required to accurately model the distortion.

Decentring lens distortion arises due to imperfect assembly of a compound lens in which the centres of curvature of each lens element are not collinear due to lateral and/or angular offsets. It can be caused by inaccurate alignment of the sensor relative to the lens mount, i.e., the optical axis is not orthogonal to the detector array [12]. The effect is asymmetric having both radial and tangential components. Conrady’s model for decentring distortion, which is expressed in terms of the radial and tangential terms, can be recast into Cartesian components

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