In this paper a new traffic flow measuring system is proposed. A slit camera is an effective tool to record objects moving in one direction. Most vehicles on roads move in one direction except for intersections. Therefore a slit camera can be used for measuring traffic flow. In a traffic situation, the speed of each vehicle differs from others and the resulting slit image could be distorted in the time axis. Two parallel slits located in proximity are used. By this configuration, the speed of each vehicle can be detected by the time difference of appearance at the two slits. Using this speed information the time axis for each respective vehicle can be adjusted to get the correct top view of each vehicle. Dimensional information of each vehicle gives vehicle type, 1-D and 2-D correlation with model vehicle image give an identification of each specific vehicle. The double slit camera is simulated using conventional TV and extracting two scan lines. Taking advantage of an interlace, two fields of every 30th of a second give a slit every 60th of a second. The speed detection and vehicle identification algorithm is applied. The results prove the feasibility and usefulness of the proposed system. (A) For the covering abstract see IRRD 882109.


  • English

Media Info

  • Features: References;
  • Pagination: p. 393-400

Subject/Index Terms

Filing Info

  • Accession Number: 00726512
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-947719-74-1
  • Files: ITRD
  • Created Date: Oct 28 1996 12:00AM