Centi-pixel accurate real-time inverse distortion correction

Jason P. de Villiers; F. Wilhelm Leuschner; Ronelle Geldenhuys

doi:10.1117/12.804771

17 November 2008 Centi-pixel accurate real-time inverse distortion correction

Jason P. de Villiers, F. Wilhelm Leuschner, Ronelle Geldenhuys

Proceedings Volume 7266, Optomechatronic Technologies 2008; 726611 (2008) https://doi.org/10.1117/12.804771
Event: International Symposium on Optomechatronic Technologies, 2008, San Diego, California, United States

Abstract

Inverse distortion is used to create an undistorted image from a distorted image. For each pixel in the undistorted image it is required to determine which pixel in the distorted image should be used. However the process of characterizing a lens using a model such as that of Brown, yields a non-invertible mapping from the distorted domain to the undistorted domain. There are three current approaches to solving this: an approximation of the inverse distortion is derived from a low-order version of Brown's model; an initial guess for the distorted position is iteratively refined until it yields the desired undistorted pixel position; or a look-up table is generated to store the mapping. Each approach requires one to sacrifice either accuracy, memory usage or processing time. This paper shows that it is possible to have real-time, low memory, accurate inverse distortion correction. A novel method based on the re-use of left-over distortion characterization data is combined with modern numerical optimization techniques to fit a high-order version of Brown's model to characterize the inverse distortion. Experimental results show that, for thirty-two 5mm lenses exhibiting extreme barrel distortion, inverse distortion can be improved 25 fold to 0.013 pixels RMS over the image.

Citation Download Citation

Jason P. de Villiers, F. Wilhelm Leuschner, and Ronelle Geldenhuys "Centi-pixel accurate real-time inverse distortion correction", Proc. SPIE 7266, Optomechatronic Technologies 2008, 726611 (17 November 2008); https://doi.org/10.1117/12.804771

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