Integrated Digital Image Correlation for the Evaluation and Correction of Optical Distortions

John-Eric Dufour (1) , François Hild (1) , Stéphane Roux (1)

1 LMT - Laboratoire de Mécanique et Technologie

Optical aberrations are one of the biases affecting images. Their correction can be performed as a transformation of the image. In this paper, it is proposed to use digital image correlation to calculate the distortion fields. A correlation calculation is performed between a known numerical pattern and a picture of the same pattern printed or etched on a plate. This new procedure is applied to determine the distortion fields of a camera lens. First, a parametric description of the distortion field is used to reduce the degrees of freedom required to describe optical distortions. Second, a non-parametric model based upon splines is used. The distortion fields found by both methods are compared. A resolution analysis is performed for two different procedures (removing the lens between pictures or not). The standard displacement resolution is found to be of the order of 10^-2 pixel in the first case, and 2.5 × 10^-3 pixel in the second case.

Mots clés: DIC; Integrated approach; Optical distortions; Resolution

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

John-Eric Dufour, François Hild, Stéphane Roux. Integrated Digital Image Correlation for the Evaluation and Correction of Optical Distortions. Optics and Lasers in Engineering, 2014, 56, pp.121-133. ⟨10.1016/j.optlaseng.2013.12.015⟩. ⟨hal-00947401⟩