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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 33 — Nov. 20, 2010
  • pp: 6472–6484

Improved Newton–Raphson digital image correlation method for full-field displacement and strain calculation

Corneliu Cofaru, Wilfried Philips, and Wim Van Paepegem  »View Author Affiliations


Applied Optics, Vol. 49, Issue 33, pp. 6472-6484 (2010)
http://dx.doi.org/10.1364/AO.49.006472


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Abstract

The two-dimensional in-plane displacement and strain calculation problem through digital image processing methods has been studied extensively in the past three decades. Out of the various algorithms developed, the Newton–Raphson partial differential correction method performs the best quality wise and is the most widely used in practical applications despite its higher computational cost. The work presented in this paper improves the original algorithm by including adaptive spatial regularization in the minimization process used to obtain the motion data. Results indicate improvements in the strain accuracy for both small and large strains. The improvements become even more significant when employing small displacement and strain window sizes, making the new method highly suitable for situations where the underlying strain data presents both slow and fast spatial variations or contains highly localized discontinuities.

© 2010 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(110.6150) Imaging systems : Speckle imaging
(110.4153) Imaging systems : Motion estimation and optical flow
(100.4999) Image processing : Pattern recognition, target tracking

ToC Category:
Imaging Systems

History
Original Manuscript: July 1, 2010
Revised Manuscript: September 1, 2010
Manuscript Accepted: September 30, 2010
Published: November 17, 2010

Citation
Corneliu Cofaru, Wilfried Philips, and Wim Van Paepegem, "Improved Newton–Raphson digital image correlation method for full-field displacement and strain calculation," Appl. Opt. 49, 6472-6484 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-33-6472


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