which differences are between roundness and circularity?

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jack nn 2015-12-10

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评论： Image Analyst 2015-12-11

hi

I want to do feature extraction from some objects in my binary image. I read some papers about roundness and circularity features. I can not understand the differences between these. can you help me to understand the differences? I am confused.

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Answer 1

Image Analyst 2015-12-10

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People may use different definitions for example perimeter^2/(4*pi*area), or the inverse of that. You need to look at the actual formulas that they use. The formulas will tell you the differences. If you want to share the formulas, then I can tell you what the formulas do.

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jack nn 2015-12-11

编辑：jack nn 2015-12-11

thanks for your attention. in some papers I read different definition for example:

but in an other definition roundness and circularity are inverse of above definition

Image Analyst 2015-12-11

Well I guess what I call circularity is what they call Compactness, and their Circularity is simply the inverse of that. The roundness looks similar to the ISO roundness definition https://en.wikipedia.org/wiki/Roundness_%28object%29

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