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Component shape recognition method
| Details |
Inventors: Morimoto, Masamichi; Okumura, Kazumasa; Mohri, Akira; Ohkawara, Daisuke;
Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner: Santos; Daniel
Attorney, Agent or Firm: Cushman, Darby & Cushman
A boundary of leads of an integrated circuit component shown by binary picture elements on a recognition plane of an image display means is detected by a conventional boundary detecting method, and respective corners of the leads are detected on the basis of variation of an angle between a predetermined axis and a line connecting two picture elements having a predetermined distance from each other on the boundary. Moreover, a shape of the lead is recognized on the basis of the shapes of the corners. Subsequently, a search zone containing a tip portion of one lead is set by referring the midpoint of the tip of the lead, and is scanned by horizonal scanning lines and vertical scanning lines. Then segments of both the scanning lines overlapping on the tip portion are obtained, and a protruding direction of the lead is detected referring to a segment touching on a boundary of a search zone. Furthermore, a midpoint of the tip is calculated from coordinate values of plural segments crossing the tip portion. |
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DETAILED DESCRIPTION An object of the present invention is to provide a component shape recognition method which enables recognition of the shape of a component which is placed at a rotated or tilted position with respect to a coordinate axis.
Another object of the present invention is to provide a component shape recognition method which can recognize a component without a large error even in the case of a lead having particulates.
The component shape recognition method in accordance with the present invention comprises the steps of: detecting the boundary of an object on a recognition plane of image display means, detecting corners of the object on the basis of variations of an angle between a predetermined axis and a line connecting two picture elements having a predetermined distance therebetween on the boundary, detecting the shape of the object on the basis of positions and shapes of the corners, detecting a midpoint of a tip portion of the object, setting a search zone containing the tip portion of the object on the recognition plane, to be scanned by horizontal scanning lines and vertical scanning lines, creating data of positions of the tip portion on the basis of the horizontal scanning lines and the vertical scanning lines, calculating segments of the horizontal scanning lines and the vertical lines overlapping with the object, detecting a protruding direction of the tip portion on the basis of a segment touching on a boundary of the search zone, and detecting a midpoint of the tip portion by calculating an average of coordinate values of plural segments crossing the tip portion.
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Image Analysis 
