Re: Perimeter measurement

Posted by Saveliev, Peter on
URL: http://imagej.273.s1.nabble.com/Perimeter-measurement-tp3696992p3696995.html

This method leads to 8% error - http://inperc.com/wiki/index.php?title=Lengths_of_curves.

Peter Saveliev



-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Gabriel Landini
Sent: Wednesday, March 05, 2008 9:12 AM
To: [hidden email]
Subject: Re: Perimeter measurement

On Wednesday 05 March 2008 11:37:11 OlgaFishkis wrote:
> Could someone explain me please why if I measure a square particle 1x1 sq.
> px the values of the area is correct (1 sq px) but the perimeter is 2.8
> instead of 4 px?
> If I apply a macro to measure a convex hull of the same square particle I
> get  the right value of the perimeter - 4.
> Thank a lot
> Olga

This answers your question:

http://imagejdocu.tudor.lu/imagej-documentation-wiki/faq/what-is-the-algorithm-used-to-calculate-particel-perimeters

Regards,

G.