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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 21, Iss. 16 — Aug. 15, 1982
  • pp: 2875–2881

Optical–digital detection of dents and scratches on specular metal surfaces

Hugh W. Lippincott and Henry Stark  »View Author Affiliations


Applied Optics, Vol. 21, Issue 16, pp. 2875-2881 (1982)
http://dx.doi.org/10.1364/AO.21.002875


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Abstract

An optical–digital approach to the problem of automatic detection of dents and scratches on specular or semispecular surfaces is presented. The method uses the optical reflecting properties of dents and scratches to locate and detect them. Dents are found by a grid projection and encoding technique; scratches are found by using the property that diffuse reflectors scatter over a wider angle (Lambert’s law) than specular ones and, therefore, seem brighter when viewed at certain angles. The procedure for finding dents and scratches was found to be very robust: dents as small as 1% of the viewed field and 0.0053 cm (0.0021 in.) deep and scratches as small as 0.003 cm (0.001 in.) wide and 0.00064 cm (0.00025 in.) deep and of variable minimum length were easily detected using nonspecially prepared samples.

© 1982 Optical Society of America

History
Original Manuscript: December 28, 1981
Published: August 15, 1982

Citation
Hugh W. Lippincott and Henry Stark, "Optical–digital detection of dents and scratches on specular metal surfaces," Appl. Opt. 21, 2875-2881 (1982)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-21-16-2875


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References

  1. G. N. Saridis, D. M. Brandin, Automatika 15, 505 (1979). [CrossRef]
  2. J. L. Mundy, G. B. Porter, “Visual Inspection of Metal Surfaces,” in Proceedings, Fifth International Conference on Pattern Recognition (IEEE Cat. No. 80 CH 1499-3, Miami, FL, 1980).
  3. G. B. Porter, J. L. Mundy, Computer 13, 40 (1980). [CrossRef]
  4. B. G. Batchelor, G. A. Williams, in “Imaging Appliations for Automated Inspection and Assembly,” Proc. Soc. Photo-Opt. Instrum. Eng. 132, (1979).
  5. P. M. Will, K. S. Pennington, “Grid Coding: A Microprocessing Technique for Robot and Machine Vision,” in Proceedings, Second International Conference on Artificial Intelligence (British Computer Soc., London, 1971).
  6. M. Potmesil, H. Freeman, “Computer Descriptions of Curved-Surface Objects,” Tech. Report CRL-58, Rensselaer Polytechnic Institute, Troy, N.Y. (June, 1978).
  7. H. W. Lippincott, “Automatic Detection of Dent and Scratch Defects on Flat, Specular Surfaces,” M.S. Thesis, Rensselaer Polytechnic Institute, Troy, New York (Aug.1981).
  8. A. Rosenfeld, A. C. Kak, Digital Picture Processing (Academic, New York, 1976). [CrossRef]

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