JPS5636769A - Line recognizing method of pattern recognition unit - Google Patents

Abstract

PURPOSE: To make it possible to recognize automatically a pattern drawn by broken lines or chain lines by detecting terminal-point coordinates of another line segment residing in an extremely small area centering basic-point coordinates and then by regarding the coordinates as expected coordinates.

CONSTITUTION: Photoelectric converter 2 binary-codes video information on drawing 1 and stores it in picture memory 3 temporarily. Next, solid-line path recognition unit 4 extracts feature points of a solid line from the information in memory 3 and then stores it in feature-point storage memory 5. Next, contiguous expectation limiting circuit 7 regards terminal-point coordinates of a specific segment in memory 5 as basic-point coordinates and finds distances between respective line segments and respective terminal points centering on the coordinates. When the distance is less than a threshold level, the coordinates are transferred to connection expectation memory 8 as contiguous expectation. Next, direction deciding circuit 9 finds the angle of the vector, etc., of the segment, to which basic-point coordinates belong, to a reference vector from coordinates stored in memory 8, and decides whether the angle is less than the reference value. Thus, connection deciding circuit 10 judges whether both segments should be connected.

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