MinFerret

[Romain]

Hello guys.

I have been desperately browsing the macro library to find out how of the minimum Feret diameter is determined on ImageJ. Does anyone have an idea? (I am looking for the source code, not for the definition of the Feret diameter).

Thanks in advance!

Romain

[Rasband, Wayne (NIH/NIMH) [E]]

On Jun 6, 2013, at 3:55 PM, Romain wrote:

> Hello guys.
>
> I have been desperately browsing the macro library to find out how of the
> minimum Feret diameter is determined on ImageJ. Does anyone have an idea? (I
> am looking for the source code, not for the definition of the Feret
> diameter).

You can search the ImageJ source code on the Developer Resources page at

     http://imagej.nih.gov/ij/developer/

I tried searching for "Feret" and found that the getFeretValues() methods in the Roi and ShapeRoi classes calculate the minimum Feret diameter.

I also tried a "Macros" search on the same page and found that the FeretsDiameter macro at

   http://imagej.nih.gov/ij/macros/FeretsDiameter.txt

calculates the Feret diameter but not minimum Feret.

-wayne

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[Romain]

Hello.

I have also tried  the searchs, but still I do not have the source code. Concerning the max Feret, I know how it is calculated.  What I do not know is how the min Feret is calculated. I could not find the code of the getFeretValues() method.

Romain

[Romain]

Ok I have it now, problem solved, thanks for the answer.

[Michael Doube-4]

Hi Romain,

> is how the min Feret is calculated.

In case anyone else is wondering, it's a minimum caliper distance:

http://cgm.cs.mcgill.ca/~orm/rotcal.html

If I remember it correctly, Wayne's implementation incrementally rotates
the ROI and measures the height of the rotated ROI, keeping the smallest
distance found during half a rotation.

An alternative macro implementation which uses the ROI points is here:

http://doube.org/files/RotatingCalipers.txt


Michael




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