Pattern recognition apparatus

Details Pattern recognition apparatus Pattern recognition apparatus

1984-02-22

1988-11-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 25, 382 30, 382 56, G06K 908

Patent

active

047838299

ABSTRACT:
A pattern recognition apparatus for recognizing a pattern derived from image data of an outline of an object region is disclosed. The apparatus comprises means for identifying the object region from the input image data, means for extracting outline pixels of the object region, means for polygon-approximating the object region based on a position relationship among the outline pixels to determine vertex coordinates of the approximation polygon, means for determining characteristic data representing a position and an attitude of the region based on the vertex coordinates, and means for superimposing the polygon-approximated object region pattern on a dictionary pattern based on the characteristic data and, determining a common region of the patterns to determine the identity of the patterns. High speed and highly reliable pattern matching is attained.

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Pavlidis et al., "Computer Recognition of Handwritten Numerals by Polygonal Approximations" IEEE Transactions on Systems, Man, and Cybernetics, vol. SMC-5, #6, Nov. 1975, pp. 610-614.
Wong et al., "Scene Matching with Invariant Moments", Computer Graphics and Image Processing, #8, 1978, pp. 16-24.

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