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Proceedings Paper

Industrial Visual System By A Symmetry Operator
Author(s): Tetsuo Sumida; Nobuo Ishii; Kenji Okamoto
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Paper Abstract

This paper describes a visual system for the purpose of pattern recognition in a group of objects, each of which is projected respectively as a circular image in a 2-dimensional picture observed through a TV camera. The recognition is based on the following. The image of an object is symmetric with respect to two lines, vertical and horizontal. The location of the object in a scene is determined by their intersecting point. The primary concern is detection of every line of symmetry. A symmetry operator and a metric. which evaluates the results of applying the operator to a binary picture are introduced for this purpose. The symmetry operator has the following advantages: 1) it simplifies the recognition algorithm; 2) it is shown that, in the experiments, it enables to get a correct re-cognition in spite of the presence of noise; 3) the function can be performed easily by a hardware system because of a local operator. An automatic handling system of the models of steel coils has been developed for an application of the visual system. The paper also presents the recognition process of steel-coil models and describes the mathematical model of the optical system for the coordinate transformation.

Paper Details

Date Published: 10 October 1979
PDF: 8 pages
Proc. SPIE 0182, Imaging Applications for Automated Industrial Inspection and Assembly, (10 October 1979);
Show Author Affiliations
Tetsuo Sumida, Sumitomo Heavy Industries, Ltd. (Japan)
Nobuo Ishii, Sumitomo Heavy Industries, Ltd. (Japan)
Kenji Okamoto, Sumitomo Heavy Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 0182:
Imaging Applications for Automated Industrial Inspection and Assembly
Richard P. Kruger, Editor(s)

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