# which differences are between roundness and circularity?

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jack nn 2015 年 12 月 10 日
コメント済み: Image Analyst 2015 年 12 月 11 日
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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### 回答 (1 件)

Image Analyst 2015 年 12 月 10 日
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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Image Analyst 2015 年 12 月 11 日
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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