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METHOD AND SYSTEM FOR ROBUST TILT ADJUSTMENT AND CROPPING OF LICENSE PLATE IMAGES

  • US 20130279758A1
  • Filed: 04/23/2012
  • Published: 10/24/2013
  • Est. Priority Date: 04/23/2012
  • Status: Abandoned Application
First Claim
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1. A method for tilt adjustment and cropping of license plate images, the method comprising:

  • converting an image of a vehicle into a binary image, said image of said vehicle including data indicative of a license plate of said vehicle and license plate characters thereof;

    removing a long run within a binary image and applying a morphological filtering to break an unwanted connection between said license plate characters due to a license plate frame and an image noise;

    identifying and screening a connected component within said binary image based on a plurality of key metrics to remove all but the most likely candidate character connected components from said binary image; and

    performing a line-fit based iterative search for a tilt removal and a vertical cropping of said binary image to obtain a tight bounding box with respect to said license plate characters if a sufficient candidate character remains after performing said line-fit based iterative search, thereby removing any inherent tilt and obtaining a vertically cropped license plate image based on said image of said vehicle.

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