Re: Possible bug with perimeter calculation on composite selections

Posted by Chris Bradhurst on Jan 26, 2009; 3:52pm
URL: http://imagej.273.s1.nabble.com/Possible-bug-with-perimeter-calculation-on-composite-selections-tp3693924p3693928.html

On Sat, 24 Jan 2009 09:26:37 +0000, Gabriel Landini <[hidden email]>
wrote:

>On Friday 23 January 2009, Chris Bradhurst wrote:
>> Another alternative workaround I am thinking of is to create a single pixel
>> width outline of the roi as a binary image and count the number of
>> foreground pixels.  This is obviously not terribly accurate, but probably
>> sufficient for my purposes.
>
>Better than pixel counting as estimates of perimeters, you could use the
>Particles8 plugin which uses Freeman's algorithm to estimate the length of the
>perimeter (distance 1 for side-connected and sqrt(2) for corner-connected
>pixel boundaries).

The particles8 plugin works very nicely for extracting perimeters.  Thanks
for the tip Gabriel.