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

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.
Publication Date: 
Saturday, December 1, 2001
Publication Number: 
WA-RD 527.1
Last modified: 
10/12/2016 - 15:41
Daniel J. Dailey, Fredrick W. Cathey, Suree Pumrin.
Washington State Transportation Center (TRAC)
Number of Pages: 
Calibration, Cameras, Closed circuit television, Estimating, Image processing, Traffic speed.