10 October 1979 Industrial Visual System By A Symmetry Operator
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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.
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Tetsuo Sumida, Tetsuo Sumida, Nobuo Ishii, Nobuo Ishii, Kenji Okamoto, Kenji Okamoto, "Industrial Visual System By A Symmetry Operator", Proc. SPIE 0182, Imaging Applications for Automated Industrial Inspection and Assembly, (10 October 1979); doi: 10.1117/12.957368; https://doi.org/10.1117/12.957368
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