Detecting line segments and predetermined patterns in an optical

Details Detecting line segments and predetermined patterns in an optical Detecting line segments and predetermined patterns in an optical

1990-03-21

1992-07-07

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 9, 382 61, G06K 946

Patent

active

051290120

ABSTRACT:
Line segments in stored picture data derived from an optically scanned document are detected by detecting line elements in the picture data, determining if the length of a line element is greater than a threshold length l.sub.th, determining a connecting relationship of one line element of greater than threshold length to another line element of greater than threshold length, and identifying a line segment in accordance with the connecting relationship of the line elements. Predetermined patterns formed of the detected line segments are detected by sensing if two line segments adjoin each other, determining the adjoining relationship of those two line segments, and identifying the pattern which includes those two line segments as a function of their adjoining relationship.

REFERENCES:
patent: 4292622 (1981-09-01), Henrichon, Jr.
patent: 4365235 (1982-12-01), Greanias et al.
patent: 4377803 (1983-03-01), Lotspiech et al.
patent: 4428077 (1984-01-01), Shimada et al.
patent: 4633502 (1986-12-01), Namba
patent: 4741045 (1988-04-01), Deaning

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