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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 10 — Oct. 1, 2012
  • pp: 2134–2143

High-precision camera distortion measurements with a “calibration harp”

Zhongwei Tang, Rafael Grompone von Gioi, Pascal Monasse, and Jean-Michel Morel  »View Author Affiliations


JOSA A, Vol. 29, Issue 10, pp. 2134-2143 (2012)
http://dx.doi.org/10.1364/JOSAA.29.002134


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Abstract

This paper addresses the high-precision measurement of the distortion of a digital camera from photographs. Traditionally, this distortion is measured from photographs of a flat pattern that contains aligned elements. Nevertheless, it is nearly impossible to fabricate a very flat pattern and to validate its flatness. This fact limits the attainable measurable precisions. In contrast, it is much easier to obtain physically very precise straight lines by tightly stretching good quality strings on a frame. Taking literally “plumb-line methods,” we built a “calibration harp” instead of the classic flat patterns to obtain a high-precision measurement tool, demonstrably reaching 2 / 100 pixel precisions. The harp is complemented with the algorithms computing automatically from harp photographs two different and complementary lens distortion measurements. The precision of the method is evaluated on images corrected by state-of-the-art distortion correction algorithms, and by popular software. Three applications are shown: first an objective and reliable measurement of the result of any distortion correction. Second, the harp permits us to control state-of-the art global camera calibration algorithms: it permits us to select the right distortion model, thus avoiding internal compensation errors inherent to these methods. Third, the method replaces manual procedures in other distortion correction methods, makes them fully automatic, and increases their reliability and precision.

© 2012 Optical Society of America

OCIS Codes
(150.1488) Machine vision : Calibration
(100.3008) Image processing : Image recognition, algorithms and filters

ToC Category:
Machine Vision

History
Original Manuscript: April 5, 2012
Revised Manuscript: June 26, 2012
Manuscript Accepted: August 6, 2012
Published: September 18, 2012

Citation
Zhongwei Tang, Rafael Grompone von Gioi, Pascal Monasse, and Jean-Michel Morel, "High-precision camera distortion measurements with a “calibration harp”," J. Opt. Soc. Am. A 29, 2134-2143 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-10-2134

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