Re: particle analysis-Feret diameter

On Sun, 27 Nov 2005, Philippe Grosjean wrote:

> 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.

Thanks Philippe,
I see. I think that if the maximum diameter is the purpose, then the
method I described is more accurate as it always finds the largest
distance.
Now I see that I was incorrect about holes in the particle. I thought that
this diameters necessarily had to pass through the centre of mass.

Thanks again.
Cheers,

Gabriel