Method of searching binary images to find search regions in whic

Details Method of searching binary images to find search regions in whic Method of searching binary images to find search regions in whic

1988-12-19

1990-02-13

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 48, 382 24, 358453, G06K 900

Patent

active

049013653

ABSTRACT:
A method of searching a matrix of binary data to find search regions in which straight lines may be found, with the straight lines being those which are perpendicular to the original direction of scanning which produced the matrix of binary data. The method comprises the steps: (a) determining a number of search scans to cover a predetermined area of the matrix of binary data; (b) scanning the predetermined area in a direction which is parallel to the original direction of scanning to search for the presence of binary indicia like binary ones along the predetermined number of search scans to generate search results for each of the search scans, with a binary one indicating the presence of data; (c) ANDing the search results of preselected search scans to generate AND-scans; (d) ORing preselected AND-scans to generate OR-scans; and (e) using the OR-scans to define the search regions in which to look for straight lines which are perpendicular to the original direction of scanning.

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patent: 4589144, Namba
patent: 4728784 (1988-03-01), Stewart
patent: 4748678 (1988-05-01), Takeda et al.
patent: 4776024 (1988-10-01), Katoh et al.

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