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circularity of a connected component

asked 2013-09-21 00:27:34 -0500

isaacenrique gravatar image

updated 2016-05-28 08:54:51 -0500


I wanted to know if it was possible to know whether a given connected component has an outer shape (relatively) circular or elliptical. Is there any function to do that? o How to calculate the circularity or roundness?.

Thanks in advance for any help and / or suggestions

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answered 2013-09-22 11:41:37 -0500

wuling gravatar image

Hi, I saw nobody answer this. But I only know some definitionss of the blob.

The circularity define:

and also from J. Russ Image Processing Handbook, Vol. 2, p. 525, there are some definitions of the blob

Formfactor      4 pi Area / Perimeter^2
Roundness       4 Area / (pi Max-diam^2)
Aspect ratio    Max-diam / Min-diam
Curl            max caliper diam / fiber length
Convexity       Convex Perimeter / Perimeter
Solidity        Area / Convex Area
Compactness     sqrt ( 4 * area / pi) / max diameter
Modification ratio    inscribed diameter / max diameter
Extent          Net Area / area of bounding rectangle
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Asked: 2013-09-21 00:27:34 -0500

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Last updated: Sep 22 '13