Need help about extracting a circular portion from image

asked 2013-04-20 10:19:48 -0600

hayden
51 ●4 ●5 ●9

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 link image description . I would like to find the circle. How to find it in OpenCV?

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I doubt that houghCircles (http://docs.opencv.org/modules/imgproc/doc/feature_detection.html?highlight=houghcircle#houghcircles) will help you with your kind of picture, but you could try it.

Guanta ( 2013-04-20 11:51:19 -0600 )edit

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answered 2013-04-20 13:40:53 -0600

Ekalic
83 ●1 ●5 http://www.tldvision.com/

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.