Has OpenCV built-in functions to calculate circularity, compactness etc for contours/blobs?

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Compactness can be defined for example as the perimeter squared, divided by 4piarea, so that a circle has a compactness of 1.

Before writing my own function, Is there a similar function in the OpenCV Library ?

Thanks.

Ps : SimpleBlobDetector does not help me as I want to calculate circularity for existing prior extracted contours.

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There are the different (Hu-)moments:

You could easily compute your compactness via cv::arcLength (perimeter) and cv::contourArea

Asked: Nov 30 '14

Seen: 13,321 times

Last updated: Nov 30 '14