Communications: electrical – Digital comparator systems
Patent
1980-10-20
1983-01-18
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
G06K 900
Patent
active
043694314
ABSTRACT:
Signature recognition by electronics requires large storage capacity and has rates of rejections of true signatures and acceptances of false signatures which are not entirely satisfactory. An apparatus for signature recognition is described in which signatures written on an input table are segmented by detecting zero slope in a waveform corresponding to the signature using a differentiator and a zero-crossing detector. Feature signals held in RAM, corresponding to one or more characteristics of a limited number of segments, for example the first twelve, are correlated against previously obtained reference values, held in RAM, by moving signals to different locations but always comparing the contents of the same pairs of locations which correspond to respective segments. After correlation has been carried out the feature and reference signals for corresponding segments are compared using the microprocessor system to provide a decision on whether to accept or reject a signature.
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"Signature Recognition for Security Systems" by E. Howbrook, pp. 377-384, Pub. No. 4, IERE Conference on Microprocessors in Automation and Communications held Sep. 1978.
Boudreau Leo H.
National Research Development Corporation
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