Communications: electrical – Digital comparator systems
Patent
1978-02-02
1979-07-03
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463E, 350150, 350285, 356 71, 356365, 358285, 356369, G06K 900
Patent
active
041602374
ABSTRACT:
The polarization of a scanning laser beam is made to oscillate at a relatively high frequency between orthogonal polarization states while being raster scanned across a multiple line pattern at a lower rate. A birefringent element in the optical path causes the two polarization states cyclically to produce light spots of two different sizes at each illuminated point of the image. This difference in spot size produces an oscillating change in the scattered light power when the grey level illuminated by the smaller spot differs from the average grey level of the surrounding area. The polarity of the detected scattered light signal relative to the polarity of the voltage producing the oscillating polarization state is used to classify the surveyed points in the image into a pattern of binary coded numbers which are readily stored or otherwise processed for pattern recognition purposes.
REFERENCES:
patent: 3502888 (1970-03-01), Stites
patent: 3563634 (1971-02-01), Parks et al.
patent: 3653767 (1972-04-01), Liskowitz
patent: 3753608 (1973-08-01), Bernal
Boudreau Leo H.
Sperry Rand Corporation
Terry Howard P.
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