labview image processing

[dfsfdsfv]

sir,

  i am trying to extract license plate from  the image using labview.i could not locate and extract license plate from the image.i cannot localize the number plate from the image,anyone please help me

[Norbert_B]

Do you have the Vision Development Module?

Norbert

[dfsfdsfv]

 sir

yes i hav all the modules including vision development, i have tried in many ways to extract the license plate but i could not,hope you can help me

[Silver_Shaper]

Post your Image

[Norbert_B]

Is the license plate always on a specific area of the image? If so, you should start by defining a "region of interest" (ROI) for that area. This will speed up analysis quite a bit.

The you will search the plate by some methologies like edge detection or pattern matching.

If you want to automatically read the license plate, you will try to use OCR (optical character recognition).

Note that those mentioned algorithms work only properly if the image quality is high. So as Sassi suggested, you should post a sample image. Then we (the community) can help you further steps.

Norbert

PS: About half the quality of your image analysis is bound to the quality of the image. If the image is bad, the best analysis cannot return desired values....

[dfsfdsfv]

sir

the problem what iam facing is that i cannot locate the position of plate from the entire image because for different images the position of the plate is varying.The important step is to lacalise the number plate from the car image.I have attached sample images

[dfsfdsfv]

sir

i have attached the image

[Norbert_B]

In general, one of the first steps is to increase contrast. This can be achieved for instance by removing color information.

Then you have to browse all your images to see what attribute(s) is(are) unique for the number plates. This can be the size, the position, the color/brightness distribution. Once you know the over all location of the plate, you should further constrict the area by using edge detection (to find the border of the plate).

Once you got the exact location of the plate, use OCR to "read" the plate.

Norbert

[dfsfdsfv]

sir

i have done edge detection of the entire image.The problem is that how to locate the position of the plate from the entire image.Then only i can go for ocr.

[Silver_Shaper]

Hi Got the solution ?