Detecting circular pattern in image

问题:

I have a image. In this image there are some vertical lines and in these lines there appear some circular/elliptical or convex patterns. I want to detect the position of these circular/elliptical or convex patterns using EmguCV / OpenCV. Can any body of you help me in this regard?

This is the image in which i want to find the circular/elliptical patterns:

waiting for your help.

回答1:

You can use Hough transform API for finding circles.

http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/OWENS/LECT6/node3.html

回答2:

You can try to

• find contours (just the outer - CV_RETR_EXTERNAL)
• fill their interiors (draw using -1 for thickness for filling)
• apply a morphology operation for detecting just the blobs (open should solve it; normally MORPH_RECT should do it, but please try more sizes to see which one is the best for your purpose)

Now you have just the wanted regions. If you need a point you may:

• detect contours again (just for the blobs)
• compute the mean point of each contour

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• or apply the moments for finding the center of each region