System having a character generator for printing encrypted messa

Details System having a character generator for printing encrypted messa System having a character generator for printing encrypted messa

1983-07-18

1987-01-13

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

101 71, 178 2208, 235101, 382 57, 400104, G06H 900

Patent

active

046370510

ABSTRACT:
A system for the metering of encrypted postage and similar indicia includes a device for printing such indicia and a device for reading such indicia. The printing is accomplished with a dot matrix printer driven by signals obtained from a character generator and an encryption circuit. The reading is accomplished by correlating received characters against a stored array of symbols to determine the presence of a symbol and the comparison of the separated coded data with a reference code to determine the accuracy of the printed material. Thereby, forgery and alteration is inhibited. Alphanumeric characters are utilized for both the data and the code, a group of characters for the data being separated from a group of characters for the code to allow for the reading of the data, while readily extracting the remaining characters for verification purposes.

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patent: 4447890 (1984-05-01), Dowel et al.
patent: 4468141 (1984-08-01), Rosza

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