Re: particle analysis-Feret diameter

Posted by Philippe Grosjean on Nov 27, 2005; 4:58pm
URL: http://imagej.273.s1.nabble.com/particle-analysis-Feret-diameter-tp3704371p3704385.html

Gabriel Landini wrote:
> [...]
> Hmm... I am confused how the algorithm should work. Can you give an
> example (just a description)on how is the whole set of Feret diameters
> calculated?
>
> Cheers,
>
> Gabriel

A naive approach (may be too naive?) is simply to rotate the particle at
given angles and then to use the width of the bounding box around the
rotated particule as the Feret diameter at that orientation. In Matrox
Imaging library, the default number of rotation angles is 6 (if my
memory is correct). I guess that a few tens of rotations would be more
accurate... but obviously much slower to calculate. Thus, a trade-off is
required.

Best,

Philippe Grosjean