비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제30권3호
  • /
  • Pages.181-193
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  • 2010
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지

Frequency-Based Image Analysis of Random Patterns: an Alternative Way to Classical Stereocorrelation

  • Molimard, J. (Laboratory of Tribology and Systems Dynamics UMR5513, University of Lyon) ;
  • Boyer, G. (Laboratoire Peritesco) ;
  • Zahouani, H. (Laboratory of Tribology and Systems Dynamics UMR5513, University of Lyon)
  • 투고 : 2010.04.06
  • 심사 : 2010.06.10
  • 발행 : 2010.06.30
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초록

The paper presents an alternative way to classical stereocorrelation. First, 2D image processing of random patterns is described. Sub-pixel displacements are determined using phase analysis. Then distortion evaluation is presented. The distortion is identified without any assumption on the lens model because of the use of a grid technique approach. Last, shape measurement and shape variation is caught by fringe projection. Analysis is based on two pin-hole assumptions for the video-projector and the camera. Then, fringe projection is coupled to in-plane displacement to give rise to 3D measurement set-up. Metrological characterization shows a resolution comparable to classical (stereo) correlation technique ($1/100^{th}$ pixel). Spatial resolution seems to be an advantage of the method, because of the use of temporal phase stepping (shape measurement, 1 pixel) and windowed Fourier transform (in plane displacements measurement, 9 pixels). Two examples are given. First one is the study of skin properties; second one is a study on leather fabric. In both cases, results are convincing, and have been exploited to give mechanical interpretation.

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참고문헌

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