Presented is a new algorithm for estimating speed by using a sequence of video images from an uncalibrated camera. An assertion is made that exact calibration is not necessary for estimating speed. Instead, the following are used to propose a novel method that extracts scale information and estimates speed: (a) geometric relationships inherently available in the image; (b) some common sense assumptions that reduce the problem to a one-dimensional geometry; (c) frame differencing to isolate moving edges and to track vehicles between frames; and (d) the distribution of vehicle lengths.
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