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Proceedings Paper

Grazing-incidence lighting techniques for machine vision inspection
Author(s): John J. Lumia
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Paper Abstract

Illumination characteristics play an important part in machine vision inspection by making certain critical features conspicuous. Frequently, the angle of illumination can be of importance in enhancing the detection of features that have height or depth. The highlights or shadows produced by grazing-incidence illumination produce contrast differences that are easily detected by an appropriate vision system. This paper explores the role of this lighting technique in machine vision applications. Three examples are presented that describe the application of this technique on paper documents. In the first example, grazing-incidence is used to detect the presence of an erased signature on a forged personal check. In the second example, the technique is used to detect the presence of an address label on a piece of mail. In the third example, grazing-incidence is used to verify the impression signature of a financial document.

Paper Details

Date Published: 1 March 1992
PDF: 12 pages
Proc. SPIE 1614, Optics, Illumination, and Image Sensing for Machine Vision VI, (1 March 1992); doi: 10.1117/12.57966
Show Author Affiliations
John J. Lumia, EKTRON Applied Imaging, Inc. (United States)


Published in SPIE Proceedings Vol. 1614:
Optics, Illumination, and Image Sensing for Machine Vision VI
Donald J. Svetkoff, Editor(s)

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