Re: SIZE MEASUREMENT OF PARTICLES (THESIS DUE TOMORROW..PLEASE HELP!)

Posted by gankaku on Aug 12, 2013; 11:48am
URL: http://imagej.273.s1.nabble.com/SIZE-MEASUREMENT-OF-PARTICLES-THESIS-DUE-TOMORROW-PLEASE-HELP-tp5004387p5004392.html

Hi Geology Guy, hi Christian,

just a short comment on the last reply. The Feret's diameter is actually the longest straight distance inside an image object (not the shortest one!). ImageJ/Fiji also gives you the minimum feret, but this is also not the smallest distance inside a feature, since the determination method kind of ignores the (small) cavities in a particular object. Therefore, feret's diameter is very usefull for certain analyses but you need to handle it with care regarding specific data.

Even though, strongly depending on your experiment and interpretation (which might justify using e.g. feret's diameter), I would agree to Christian and rather take the area if I want to compare it to the overall area of the bigger feature (composed of the smaller ones). Because then, you compare area with area.

kind regards,
Jan

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