Method and apparatus for identifying vehicle information from an image

  • US 10,540,564 B2
  • Filed: 06/20/2018
  • Issued: 01/21/2020
  • Est. Priority Date: 06/27/2014
  • Status: Active Grant
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First Claim
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1. A mobile apparatus, comprising:

  • an image sensor configured to capture at least one optical image into an electrical signal, the at least one optical image including an image of a vehicle license plate; and

    a license plate detector configured to;

    identify, by a processor, one or more object images from the at least one optical image based on the electrical signal, with each of said one or more object images comprising a candidate vehicle license plate image having a plurality of alphanumeric characters,crop, by the processor, the at least one optical image to said identified one or more of the object images,provide a rectangular fitting around each character of the plurality of alphanumeric characters in the one or more object images,score, by the processor, each of said cropped one or more of the object images by applying a straight line to a center of the respective rectangular fittings of each pair of alphanumeric characters, summing a distance of all other respective rectangular fittings to each respective fitted line, selecting the respective pair of alphanumeric characters corresponding to the respective fitted line with a smallest summed distance of all of the fitted lines as a text baseline for the candidate vehicle license plate, and computing the score for candidate vehicle license plate having the selected text baseline based on the calculated slope of the fitted line for the selected pair of alphanumeric characters,based on the computer score, obtain vehicle information generated from the candidate vehicle license plate image, with the obtained vehicle information including at least one physical feature of a possible vehicle,detect vehicle identification information from the at least one optical image, the detected vehicle identification information including at least one identifying feature corresponding to a vehicle in the at least one optical image, andcompare the detected vehicle identification information to the obtained vehicle information generated from the candidate vehicle license plate image to determine an estimated level of accuracy for the candidate vehicle license plate image.

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