Apparatus for detecting two-dimensional pattern and method for t

Details Apparatus for detecting two-dimensional pattern and method for t Apparatus for detecting two-dimensional pattern and method for t

1982-04-21

1985-03-19

Martin, John C.

Image analysis

Histogram processing

For setting a threshold

382 41, 382 49, 382 54, 358166, 358167, 358284, G06K 956, H04N 521

Patent

active

045063826

ABSTRACT:
Two-dimensional pattern detecting apparatus provided with register for serially receiving binary signals obtained from analog signals of a two-dimensional pattern and adapted to divide the pattern into pixels and to represent the density of bright and dark for pixels by the binary signals. The apparatus further includes a processing circuit adapted to compare with predetermined patterns a pattern composed of 8 peripheral pixels of a partial area of 3.times.3 pixels within the two-dimensional pattern, on the basis of the binary signals stored in the register. The processing circuit outputs a binary signal of a logic value stored in said register corresponding to a central pixel of the partial area when the pattern of the 8 pixels coincides with one of said predetermined patterns, and to outputs a binary signal of a logic value prevailing in 8 binary signals stored in the register corresponding to the 8 pixels when the pattern of the 8 pixels does not coincide with any of the predetermined patterns.

REFERENCES:
patent: 3341814 (1967-09-01), Chow
patent: 3668637 (1972-06-01), Sakai et al.
patent: 4003024 (1977-01-01), Riganati et al.
patent: 4115760 (1978-09-01), Ito
patent: 4204232 (1980-05-01), Mizuno
patent: 4208651 (1980-06-01), McMahon

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