OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 25 — Sep. 1, 1998
  • pp: 5894–5901

Automatic processing in moiré deflectometry by local fringe direction calculation

Héctor Canabal, J. Antonio Quiroga, and Eusebio Bernabeu  »View Author Affiliations


Applied Optics, Vol. 37, Issue 25, pp. 5894-5901 (1998)
http://dx.doi.org/10.1364/AO.37.005894


View Full Text Article

Enhanced HTML    Acrobat PDF (3277 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

An algorithm for accurately extracting the local fringe direction is presented. The algorithm estimates, in the neighborhood of n × n points, the direction of the gradient that points normal to the local fringe direction. The performance of four different derivative kernels is also compared. Since this method is sensitive to noise and variations in background and amplitude, a preprocessing step is used to limit these error sources. The method has been applied to the moiré deflectogram of a spherical and a progressive addition ophthalmic lens, resulting in a map of the refractive power of these lenses. The results are compared with the data obtained with a commercial focimeter. This technique is useful for analyzing the fringe patterns where the fringe direction is variable and must be obtained locally.

© 1998 Optical Society of America

OCIS Codes
(100.2650) Image processing : Fringe analysis
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques

History
Original Manuscript: December 12, 1997
Revised Manuscript: March 19, 1998
Published: September 1, 1998

Citation
Héctor Canabal, J. Antonio Quiroga, and Eusebio Bernabeu, "Automatic processing in moiré deflectometry by local fringe direction calculation," Appl. Opt. 37, 5894-5901 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-25-5894


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. O. Kafri, Y. Glatt, The Physics of Moiré Metrology (Wiley, New York, 1989).
  2. M. Servin, R. Rodriguez-Vera, M. Carpio, A. Morales, “Automatic fringe detection algorithm used for moiré deflectometry,” Appl. Opt. 29, 3266–3270 (1990). [CrossRef] [PubMed]
  3. Y. Nakano, K. Murata, “Talbot interferometry for measuring the focal length of a lens,” Appl. Opt. 24, 3162–3166 (1985). [CrossRef] [PubMed]
  4. Y. Nakano, R. Ohmura, K. Murata, “Refractive power mapping of progressive power lenses using Talbot interferometry and digital image processing,” Opt. Laser Technol. 22, 195–198 (1990). [CrossRef]
  5. Q. Yu, X. Liu, K. Andresen, “New spin filters for interferometric fringe patterns and grating patterns,” Appl. Opt. 33, 3705–3711 (1994). [CrossRef] [PubMed]
  6. Q. Yu, K. Andresen, “Fringe-orientation maps and fringe skeleton extraction by the two-dimensional derivative-sign binary-fringe method,” Appl. Opt. 33, 6873–6878 (1994). [CrossRef] [PubMed]
  7. Q. Yu, K. Andresen, W. Osten, W. Jueptner, “Noise free normalized fringe patterns and local pixel transforms for strain extraction,” Appl. Opt. 20, 3783–3790 (1996). [CrossRef]
  8. W. Pratt, Digital Image Processing (Wiley, New York, 1991), Chap. 16.
  9. H. Vrooman, A. Maas, “Image processing algorithms for the analysis of phase-shifted speckle interference patterns,” Appl. Opt. 30, 1636–1641 (1991). [CrossRef] [PubMed]
  10. B. Ströbel, “Processing of interferometric phase maps as complex-valued phasor images,” Appl. Opt. 35, 2192–2198 (1996). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited