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How do I find a license plate in an image?

I thought to look for the color of the plate, but I have a problem when there is another thing in the image in the same color.

Peter Mortensen
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Ofir A.
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  • Is there a way to make it check shapes or border colors (Since I don't know of any license plates that don't have a border)? – user535617 Feb 01 '11 at 16:22
  • i didn't think to look for the borders, it's a nice idea. but how can i distinguish between other borders that the image contains? – Ofir A. Feb 01 '11 at 16:47
  • Try using the search function: http://stackoverflow.com/search?q=license+plate – tkerwin Feb 01 '11 at 16:56
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    I posted a working solution in http://stackoverflow.com/questions/4777677/determining-color-range-for-pixel-comparison/4778495#4778495 – Dr. belisarius Feb 01 '11 at 17:15

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In general you're going to be looking for some other features that make it obviously a license plate. Using some combination of feature detectors will probably help disambiguate this. There's already a lot of literature on detecting license plates.

Flexo
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