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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 6 — Feb. 20, 2010
  • pp: 1001–1006

Method of rotation angle measurement in machine vision based on calibration pattern with spot array

Weimin Li, Jing Jin, Xiaofeng Li, and Bin Li  »View Author Affiliations


Applied Optics, Vol. 49, Issue 6, pp. 1001-1006 (2010)
http://dx.doi.org/10.1364/AO.49.001001


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Abstract

We propose a method of rotation angle measurement with high precision in machine vision. An area scan CCD camera, imaging lens, and calibration pattern with a spot array make up the measurement device for measuring the rotation angle. The calibration pattern with a spot array is installed at the rotation part, and the CCD camera is set at a certain distance from the rotation components. The coordinates of the spots on the calibration pattern is acquired through the vision image of the calibration pattern captured by the CCD camera. At the initial position of the calibration pattern, the camera is calibrated with the spot array; the mathematical model of distortion error of the CCD camera is built. With the equation of coordinate rotation measurement, the rotation angle of the spot array is detected. In the theoretic simulation, noise of different levels is added to the coordinates of the spot array. The experiment results show that the measurement device can measure the rotation angle precisely with a noncontact method. The standard deviation of rotation angle measurement is smaller than 3   arc   sec . The measurement device can measure both microangles and large angles.

© 2010 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(330.1880) Vision, color, and visual optics : Detection
(350.4600) Other areas of optics : Optical engineering
(150.1135) Machine vision : Algorithms
(150.1488) Machine vision : Calibration
(330.7325) Vision, color, and visual optics : Visual optics, metrology

ToC Category:
Machine Vision

History
Original Manuscript: September 11, 2009
Revised Manuscript: December 9, 2009
Manuscript Accepted: January 20, 2010
Published: February 17, 2010

Citation
Weimin Li, Jing Jin, Xiaofeng Li, and Bin Li, "Method of rotation angle measurement in machine vision based on calibration pattern with spot array," Appl. Opt. 49, 1001-1006 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-6-1001

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