Image analysis – Histogram processing – For setting a threshold
Patent
1990-04-18
1991-10-01
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 48, G06K 936
Patent
active
050540912
ABSTRACT:
A method determines coordinates of a circumscribed rectangular frame for enclosing each character based on image data of character images in a recognition area. First of all, specified image data of a predetermined data unit in a transverse direction including at least one bit of black pixel are determined by scanning the image data. Thereafter, top and bottom coordinates of a circumscribed rectangular frame are determined respectively by searching respective image data located at the top and bottom positions among plural image data including at least one bit of black pixel located on the upper and lower sides of the specified image data, wherein respective bits of black pixel of plural image data are substantially continuously connected in a longitudinal direction, and then, leftmost and rightmost coordinates of the circumscribed rectangular frame are determined based on histogram data composed of either logical products or logical sums of respective bits in the transverse direction.
REFERENCES:
patent: 3930228 (1975-12-01), Spanuersberg
patent: 4295121 (1981-10-01), Enser et al.
patent: 4527283 (1985-07-01), Ito et al.
patent: 4847912 (1989-07-01), Tanaka et al.
patent: 4850025 (1989-07-01), Abe
patent: 4903311 (1990-02-01), Nakamura
Hirose Hitoshi
Kitamura Yoshihiro
Morita Toshiaki
Nakamura Yasuhisa
Saiga Hisashi
Boudreau Leo H.
Sharp Kabushiki Kaisha
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