ANPR Week 13 (Day 61-65): ANPR Algorithm

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This week was used in understanding the ANPR algorithm and its different components and steps. There are seven primary algorithms that the software requires for identifying a license plate:

  1. Plate localization – responsible for finding and isolating the plate on the picture.
  2. Plate orientation and sizing – compensates for the skew of the plate and adjusts the dimensions to the required size.
  3. Normalization – adjusts the brightness and contrast of the image.
  4. Character segmentation – finds the individual characters on the plates.
  5. Optical character recognition.
  6. Syntactical/Geometrical analysis – check characters and positions against country-specific rules.
  7. The averaging of the recognised value over multiple fields/images to produce a more reliable or confident result. Especially since any single image may contain a reflected light flare, be partially obscured or other temporary effect.

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