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Questions about equations of Shape Descriptors

Posted by Ruszkai Ákos on Feb 25, 2010; 9:10pm
URL: http://imagej.273.s1.nabble.com/Questions-about-equations-of-Shape-Descriptors-tp3688338.html

Hello,

I think I'm asking trivial questions again, but I better be sure about this.

http://rsbweb.nih.gov/ij/docs/menus/analyze.html says:

*Round* (roundness): 4*area/(π*sqr(major axis)), or the inverse of the
aspect ratio.

So... does area in this equation mean "area of best fit ellipse" ? I suppose
it does, as we're talking about "major axis" in the denominator.
Also, does sqr mean pow(major axis, 2) aka (major axis)^2 ?
In that case, how'd you write square root?

Regards,

Ákos