A traffic survey system is described in which an aerial photo survey transparency is first made of a significant survey area. 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 is directed solely to roadway regions. Vehicle size analysis is accomplished by means of discrete holographic filters corresponding to selected size vehicles.

  • Supplemental Notes:
    • Government-owned invention available for licensing. Copy of application available NTIS.
  • Corporate Authors:

    Marshall Space Flight Center

    National Aeronautics and Space Administration
    Huntsville, AL  United States  35812
  • Authors:
    • Kerr, J H
  • Publication Date: 1972-12-11

Media Info

  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00091153
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PAT-APPL-531572
  • Files: TRIS
  • Created Date: Jun 26 1975 12:00AM