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Short-time stopping detection from red light camera evidentiary photos

  • US 9,685,079 B2
  • Filed: 05/15/2014
  • Issued: 06/20/2017
  • Est. Priority Date: 05/15/2014
  • Status: Active Grant
First Claim
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1. A method to detect a vehicle running a stop signal, the method comprising:

  • acquiring at least two evidentiary images of a candidate violating vehicle captured from at least one camera monitoring an intersection, the at least two evidentiary images including a first image of an intersection before a stop line and a second image of an area located within or after the intersection;

    extracting feature points in each of the at least two evidentiary images;

    computing feature descriptors for each of the extracted feature points;

    determining a correspondence between feature points having matching feature descriptors at different locations in the at least two evidentiary images;

    extracting at least one attribute for each correspondence by determining if the each correspondence belongs to one of a spurious match and a true match;

    for each correspondence belonging to a true match, comparing the attribute to a threshold; and

    , classifying the candidate violating vehicle as belonging;

    to one of a violating vehicle running the stop signal and a non-violating vehicle based on the comparing.

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