Traffic survey system

Details Traffic survey system Traffic survey system

1974-12-11

1976-01-06

Smith, Alfred E.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

340 38P, 356 71, 356162, G08G 100

Patent

active

039307352

ABSTRACT:
This invention is of a traffic survey system in which an aerial photo survey transparency is first made of a significant survey area, for example, two kilometers square. The transparency is then optically scanned to check the position and size of vehicles on roadways in the area. By computer control comparison with a reference transparency wherein areas other than roadways are made opaque and roadways are made clear, scanning may be directed solely to roadway regions. Vehicle size analysis is accomplished by means of discrete holographic filters corresponding to selected size vehicles.

REFERENCES:
patent: 2899857 (1959-08-01), Rockafellow
patent: 3663937 (1972-05-01), Bolner

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