Image analysis – Histogram processing – For setting a threshold
Patent
1988-09-19
1991-06-18
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 60, G06K 900
Patent
active
050254790
ABSTRACT:
An item bearing an indicia which verifies a status of the item and a method and apparatus for applying such indicia. The indicia represents an encrypted message and has the form of a number n base N number system represented by characters selected from an unambiguous machine-readable character set having n characters. The characters consist of connected graphs drawn on a predetermined grid and meeting certain selected requirements. A set of descripters is selected, including a number of type 1 and type 3 points in a character and a subset of characters is selected from the set of all possible characters meeting the requirements so that each character is unambiguously described in terms of the selected descripters. In one embodiment disclosed the item is a mail piece and the status is the payment of postage.
REFERENCES:
patent: 3245036 (1966-04-01), Grottrup
patent: 3605093 (1971-09-01), Parks et al.
patent: 3832682 (1974-08-01), Brok et al.
patent: 3890596 (1975-06-01), Beun et al.
Boudreau Leo H.
Dinh Tan
Pitchenik David E.
Scolnick Melvin J.
Whisker Robert H.
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