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The Use of Uncalibrated Roadside CCTV Cameras to Estimate Mean Traffic Speed

Description: In this report, the authors present a novel approach for estimating traffic speed using a sequence of images from an uncalibrated camera. They assert that exact calibration is not necessary to estimate speed. Instead, to estimate speed, they use: (1) geometric relationships inherently available in the image, (2) some common sense assumptions that reduce the problem to 1-dimensional geometry, (3) frame differencing to isolate moving edges and track vehicles between frames, and (4) parameters from the distribution of vehicle lengths.

  • Date Published: December, 2001
  • Publication Number: WA-RD 527.1
  • Last Modified: May 4, 2007
  • Authors: Daniel J. Dailey, Fredrick W. Cathey, Suree Pumrin.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 29 p., 357 KB (PDF)
  • Subject: Calibration, Cameras, Closed circuit television, Estimating, Image processing, Traffic speed.
  • Keywords: Video image processing, calibration, camera, speed sensor, traffic flow, vehicle length distribution.
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This abstract was last modified April 29, 2008