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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 6642–6660

Inspection of complex surfaces by means of structured light patterns

Yannick Caulier  »View Author Affiliations

Optics Express, Vol. 18, Issue 7, pp. 6642-6660 (2010)

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This paper addresses the generalization of a surface inspection methodology developed within an industrial context for the characterization of specular cylindrical surfaces. The principle relies on the interpretation of a stripe pattern, obtained after projecting a structured light onto the surface to be inspected. The main objective of this paper is to apply this technique to a broader range of surface geometries and types, i.e. to free-form rough and free-form specular shapes. One major purpose of this paper is to propose a general free-form stripe image interpretation approach on the basis of a four step procedure: (i) comparison of different feature-based image content description techniques, (ii) determination of optimal feature sub-groups, (iii) fusion of the most appropriate ones, and (iv) selection of the optimal features. The first part of this paper is dedicated to the general problem statement with the definition of different image data sets that correspond to various types of free-form rough and specular shapes recorded with a structured illumination. The second part deals with the definition and optimization of the most appropriate pattern recognition process. It is shown that this approach leads to an increase in the classification rates of more than 2 % between the initial fused set and the selected one. Then, it is demonstrated that with approximately a fourth of the initial features, similar high classification rates of free-form surfaces can be obtained.

© 2010 Optical Society of America

OCIS Codes
(100.2650) Image processing : Fringe analysis
(150.3040) Machine vision : Industrial inspection

ToC Category:
Image Processing

Original Manuscript: November 25, 2009
Revised Manuscript: January 25, 2010
Manuscript Accepted: January 26, 2010
Published: March 16, 2010

Yannick Caulier, "Inspection of complex surfaces by means of structured light patterns," Opt. Express 18, 6642-6660 (2010)

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