Finding an arrow in an archery target picture

asked 2013-07-16 17:32:08 -0600

I'm working on a project where I need to find the arrows in a picture of an archery target. I thought that the best way would be to use the Hough Line Transformation, but that doesn't seem to be giving any results. Bellow is an example image I am working with. If anyone who has a better understand of image processing and could advise on how they would go about doing this that would be great!

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answered 2013-07-17 07:29:59 -0600

StevenPuttemans

20029 ●16 ●82 ●207 http://stevenputtemans...

There is a 3D technique called shape from shading, which could be interesting for you. However, this can only be done with a stereo camera setup and images of different positions.

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This sounds interesting but unfortunately I can only use one image such as above.

Edward ( 2013-07-17 16:39:48 -0600 )edit

Then what I would do is the following approach.

 1. First apply hough circle detection to your image.
 2. Then apply hough lines detection to your image.
 3. Create some logic that retrieves lines that are almost perpendicular to the circles.
 4. The largest one will give you the shadow, the smallest one the arrow?

Go ahead and try :)