How to recognize vehicle license / number plate (ANPR) from an image?

Ryan_ONeill_26221 0
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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.
automatic-license-plate-recognition computer-vision ocr image
12 Answers

I came across this one that is written in java javaANPR, I am looking for a c# library as well.

I would like a system where I can point a video camera at some sailing boats, all of which have large, identifiable numbers on them, and have it identify the boats and send a tweet when they sail past a video camera.

teknologika_491560

I have done some googling about this a couple of months ago. There are quite a few papers about this topic, but I never found any concrete open-source implementation. There are a lot of commercial implementations though, but none of them with a price quote, so they're probably pretty expensive.

mausch_212390
user_2222160
user_421980

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?

Ans: The CARMEN FreeFlow ANPR Software engine (Commerical)

user_392780
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