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Need help about extracting a circular portion from image

asked 2013-04-20 10:19:48 -0500

hayden gravatar image

Hello, I am quite new in OpenCV. I have an image with a faint white border marked with a red arrow as shown in the following linkimage description. I would like to find the circle. How to find it in OpenCV?

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I doubt that houghCircles ( will help you with your kind of picture, but you could try it.

Guanta gravatar imageGuanta ( 2013-04-20 11:51:19 -0500 )edit

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answered 2013-04-20 13:40:53 -0500

I was wondering what sort of sensor gives you this output and what you are looking for (if it's not a secret). As mentioned in comment by @Guanta, the standard way to search for circles is to use Hough transform houghCircles. But in your case the noise is probably too high.

If you have access to gray-scale pixel values you may thing about some image filtering and apply Hough transform on the filtered image.

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I have uploaded the original image to the following link:

I would like to extract the portion marked by red arrow.

hayden gravatar imagehayden ( 2013-04-20 14:14:58 -0500 )edit

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Asked: 2013-04-20 10:19:48 -0500

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Last updated: Apr 20 '13