Re: Questions about equations of Shape Descriptors

Posted by Ruszkai Ákos on Feb 26, 2010; 12:57am
URL: http://imagej.273.s1.nabble.com/Questions-about-equations-of-Shape-Descriptors-tp3688338p3688349.html

Hello,

On 26 February 2010 01:39, Norbert Vischer <[hidden email]> wrote:

> The area of an irregular roi, and that its of best-fitting ellipse, are the
> same (so are their moments of inertia).
>
>
> The "sqr" in the above equation does mean "square" (though it's not macro
> syntax).
>

So I can assume "square" here truly means x^2

Major axis and max Feret diameter are not the same. The best-fitting ellipse
> is a much more robust measurement than the Feret diameter, as all pixels
> inside an object are taken into account, not only the perimeter pixels.
>

So the A for Area is best fitting ellipse area and major minor axis of best
fitting ellipse in AR, Round? And what about Circularity?
(I'm rewriting those parts in my thesis that describe what's what in the
equation now for at least the 4th time :D )

Regards

Ákos