Re: Perimeter, Does anyone know exactly how perimeter works?

Posted by Adam Hughes on Oct 27, 2014; 3:43pm
URL: http://imagej.273.s1.nabble.com/Perimeter-Does-anyone-know-exactly-how-perimeter-works-tp5010191p5010203.html

You may want to read this older thread, where we got into a discussion on
various encoding algorithms.  I also found the perim. attribute to be
counter-intuitive in certain cases, and this clarified.

http://comments.gmane.org/gmane.comp.java.imagej/31695

On Mon, Oct 27, 2014 at 9:04 AM, Mark Hiner <[hidden email]> wrote:

> Hi everyone,
>
> >ImageJ is open source, i.e. you should be able to find the very code.
> Actually I found it easily:
>
> For reference, see also this FAQ entry
> <http://imagej.net/FAQ#How_do_I_find_more_information_about_Command_X.3F>
> for general steps on finding more information about a given command. Please
> let me know if you try to use these instructions and have any problems.
>
> Best,
> Mark
>
> On Sun, Oct 26, 2014 at 2:48 PM, Herbie <[hidden email]> wrote:
>
> > Tom Lowe,
> >
> > ImageJ is open source, i.e. you should be able to find the very code.
> > Actually I found it easily:
> >
> > <http://imagej.nih.gov/ij/source/ij/plugin/filter/Analyzer.java>
> >
> > On this page do a search for PERIMETER.
> >
> > HTH
> >
> > Herbie
> >
> > :::::::::::::::::::::::::::::::
> >
> > On 26.10.14 17:38, TLowe wrote:
> >
> >> The perimeter function in ImageJ appears to act on edge pixels,
> assigning
> >> pixels along the edge os a selection then either a +1 length or a
> sqrt(2)
> >> length. It generally follows the equation Y+Xsqrt(2); where Y and X are
> >> whole numbers. I've been trying to come up with a list of "rules" for
> this
> >> assignment, but unsuccessfully. I've also been unable to come up with
> >> source
> >> code that should reveal what rules are being used. Does anyone know
> >> exactly
> >> how perimeter works?
> >>
> >>
> >>
> >> -----
> >> Tom Lowe
> >> Chemical Technician
> >> Eastman Kodak
> >> --
> >> View this message in context: http://imagej.1557.x6.nabble.
> >>
> com/Perimeter-Does-anyone-know-exactly-how-perimeter-works-tp5010191.html
> >> Sent from the ImageJ mailing list archive at Nabble.com.
> >>
> >> --
> >> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
> >>
> >>
> > --
> > ImageJ mailing list: http://imagej.nih.gov/ij/list.html
> >
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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