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Camera Calibration Method for Accurate Full-Field Strain Measurement by Dot Centroid Method

[+] Author Affiliations
Takuya Toyoshi, Yoshitaka Wada

Tokyo University of Science, Suwa, Chino, Nagano, Japan

Tomonari Furukawa

Virginia Tech, Danville, VA

Paper No. DETC2012-70681, pp. 959-966; 8 pages
doi:10.1115/DETC2012-70681
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 32nd Computers and Information in Engineering Conference, Parts A and B
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4501-1
  • Copyright © 2012 by ASME

abstract

This paper presents a new method for the correction of the lens distortion for full-field measurement using dot centroid method. Displacement and strain can be obtained from full-field digital images, which include centroids represented by many dots on the specimen. The captured images are distorted by an optical system. Several ideas to remove such a distortion are developed, however the image is corrected by an interpolation for brightness intensity level. In short it is hard to achieve high accuracy for strain measurement by the interpolation, because high accuracy needs sub-pixel effect for computing a centroid.

In this paper, the dot centroid method is employed and the centroids are directly corrected by the proposed method, which directly compute the only positions of centroids. Due to the correction, 0.1% strain accuracy is accomplished and total computation time is reduced. Effectiveness of the idea is shown through numerical examples and the result of strain field measurement is presented and discussed.

Copyright © 2012 by ASME

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