Collision warning system

  • US 8,082,101 B2
  • Filed: 01/19/2005
  • Issued: 12/20/2011
  • Est. Priority Date: 04/08/2004
  • Status: Active Grant
First Claim
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1. A method of estimating a time-to-collision (TTC) of a vehicle with an object comprising the step of:

  • (a) acquiring a plurality of images of the object at known time intervals between the times t at which the images are acquired;

    (b) determining a momentary time Tv(t), which is equal to an instantaneous distance between the vehicle and the object at time t divided by an instantaneous relative velocity, from information derived from the images and the time intervals; and

    determining the time-to-collision (TTC) based on a rate of change over times t of momentary time Tv(t).

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