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image-processingcomputer-visionedge-detection

License plate detection

My task is to pin-point where is the plate number in an image. The image does not only contain the plate number. It may contain the whole car or anything. I used gaussian blur then grayscale then contrast then laplacian of gaussian to detect the edges.

Now, I am at loss on how to detect where is the plate number in the image. I am not going to read the license number, just make the system know where is the license number.

Can you direct me to a study regarding this? Or perhaps the algorithm that can be used to do this.

Thank you!

Solution

  • You could try edge detection or some form of Hough transforms.

    For example, do edge detection and then look for rectangles (or if the images aren't straight on, parallelograms) in the image. If you know that the plates will all be the same shape and size ratios, you can use that to speed up your search.

    EDIT:

    Found this for you.