Method for character-and/or-object recognition

Details Method for character-and/or-object recognition Method for character-and/or-object recognition

1988-06-17

1991-07-16

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 33, 382 38, 382 42, G06K 962

Patent

active

050331019

ABSTRACT:
Unknown characters and objects are read opto-electronically and the read signals are digitized to generate a binary image of the characters and objects, said image being compared with binary reference images of known reference characters and reference objects stored in reference memories, the reference raster image(s) with the highest coincidence with the read characters or objects being selected to identify the read-in characters or objects. The stored binary reference images form a first binary comparison plane. At least one more binary comparison plane is provided, which consists of stored reference raster images generated by the binary imaging of characteristics or of characteristics parts of the known characters and objects. The actual character or object image read-in in binary manner is compared with at least one reference raster image of a further comparison plane for coincidence if the comparison with the reference raster image of the first comparison plane, or of the first comparison plane combined with a further comparison plane, results in a degree of coincidence below a predetermined threshold.

REFERENCES:
patent: 3713100 (1973-01-01), Hemtreet
patent: 3846752 (1974-11-01), Nakano et al.
patent: 4581762 (1956-04-01), Lapidus et al.
patent: 4736437 (1988-04-01), Sacks et al.
patent: 4794646 (1988-12-01), Takeuchi et al.
patent: 4805224 (1984-02-01), Koezuka et al.

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