Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-04-21
1979-01-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
3401463MA, G06K 900
Patent
active
041340213
ABSTRACT:
This disclosure deals with a method of classifying characters having characteristics which differ greatly from standard characters, where the characters are projected onto an image field, said field being divided into imaginary raster areas; where, by means of photo-electric devices, from each raster area, a raster area voltage is generated, and at an area of the background where there is no character, a reference voltage is generated; each raster area voltage is subtracted from the reference voltage and thus, for each raster area, a raster area difference voltage is generated; these raster area difference voltages, by forming linear combinations, are processed into output voltages, and, by comparing the output voltages with a sum raster area difference voltage which is generated by totalling the raster area difference voltages, it is ascertained whether the output voltage of each linear combination lies within the limits decisive or determinative for the class to be identified.
REFERENCES:
patent: 3432673 (1969-03-01), Mader
patent: 3790955 (1974-02-01), Klemt
patent: 3795894 (1974-03-01), Klemt
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