Sign verification

Details Sign verification Sign verification

1985-08-30

1987-07-14

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 30, G06K 900

Patent

active

046808019

ABSTRACT:
A method of determining whether the writer of a sign is the same as the writer of a previously written sign at least one characteristic feature of which has been prerecorded comprises: (a) detecting at least one characteristic feature of the written sign; (b) comparing the or each detected feature with the corresponding prerecorded feature (s); (c) generating an acceptance signal if all differences between the detected and the prerecorded features lie within first predetermined limits; (d) if an acceptance signal cannot be generated, obtaining one or more further written signs (up to a predetermined maximum) and repeating steps (a) to (c) with the or each further written signs; (e) if an acceptance signal cannot be generated for the or any of the further written signs, comparing the differences between the characteristic features of each written sign and the corresponding characteristic of the prerecorded sign and, if all the differences fall within second predetermined limits; (f) comparing corresponding characteristic features of the written signs and generating an acceptance signal if all differences between the features lie within third predetermined limits.

REFERENCES:
patent: 4028674 (1977-06-01), Chuang
patent: 4040010 (1977-08-01), Crane et al.
IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, "Supervised Adaption for Signature Verification System", Anthony et al., pp. 424-425.
IBM Technical Disclosure Bulletin, vol. 24, No. 2, Jul. 1981, "Personal Identification Systems Performance Improvement Algorithm" by Grossman et al., pp. 914-917, WO 82/03485 (NCR), Oct. 14, 1982.

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