Traffic survey system
First Claim
Patent Images
1. A traffic survey system comprising:
- holding means for holding a transparency image frame of a discrete area containing at least one roadway;
light means including a beam of light positioned to project light on said transparency image frame and including beam positioning means responsive to an input scanning signal for causing said beam to scan discrete coordinately located areas of roadways on said transparency;
first scan generating means for generating a said scanning signal and supplying it to said light means, whereby said transparency image frame is scanned;
detection means responsive to light passed by said transparency for indicating the presence of a vehicle on a said roadway; and
memory means responsive to said scan generating means and said detection means for storing an indication of the presence of a vehicle in a coded memory location.
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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.
14 Citations
6 Claims
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1. A traffic survey system comprising:
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holding means for holding a transparency image frame of a discrete area containing at least one roadway; light means including a beam of light positioned to project light on said transparency image frame and including beam positioning means responsive to an input scanning signal for causing said beam to scan discrete coordinately located areas of roadways on said transparency; first scan generating means for generating a said scanning signal and supplying it to said light means, whereby said transparency image frame is scanned; detection means responsive to light passed by said transparency for indicating the presence of a vehicle on a said roadway; and memory means responsive to said scan generating means and said detection means for storing an indication of the presence of a vehicle in a coded memory location. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification