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Fast license plate verifier

  • US 8,229,168 B2
  • Filed: 02/20/2008
  • Issued: 07/24/2012
  • Est. Priority Date: 02/20/2008
  • Status: Expired due to Fees
First Claim
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1. A method for identifying vehicles, comprising:

  • capturing a first image of a first vehicle using a first camera at a first position and a second image of the first vehicle using a second camera at a second position different from the first position;

    determining a transformation between the first image and the second image;

    capturing a third image of a second vehicle using the first camera;

    applying the transformation to the third image to generate a fourth image of the second vehicle; and

    analyzing the fourth image using a database of identified vehicles to determine an identity of the second vehicle;

    capturing a fifth image of a third vehicle using the first camera and a sixth image of the third vehicle using the second camera;

    determining an alternate transformation between the fifth image and the sixth image; and

    determining a mean transformation as an average of the transformation and the alternate transformation, and wherein applying the transformation comprises applying the mean transformation;

    capturing a seventh image of a fourth vehicle using the first camera and an eighth image of the fourth vehicle using the second camera;

    determining a further transformation between the seventh image and the eighth image; and

    determining if the further transformation exceeds the mean transformation by a preset threshold;

    and comprising, in response to a positive determination that the further transformation exceeds the mean transformation by the preset threshold, identifying a change in an imaging parameter of one camera chosen from the first camera and the second camera.

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