How to recognise vehicle licence / number plate (ANPR) from an image?

Posted by Ryan ONeill on Stack Overflow See other posts from Stack Overflow or by Ryan ONeill
Published on 2009-06-11T14:18:33Z Indexed on 2010/04/17 20:33 UTC
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Hi all,

I have a web site that allows users to upload images of cars and I would like to put a privacy filter in place to detect registration plates on the vehicle and blur them.

The blurring is not a problem but is there a library or component (open source preferred) that will help with finding a licence within a photo?

Caveats;

  1. I know nothing is perfect and image recognition of this type will provide false positive and negatives.
  2. I appreciate that we could ask the user to select the area to blur and we will do this as well, but the question is specifically about finding that data programmatically; so answers such as 'get a person to check every image' is not helpful.
  3. This software method is called 'Automatic Number Plate Recognition' in the UK but I cannot see any implementations of it as libraries.
  4. Any language is great although .Net is preferred.

Thanks in advance

Ryan

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