Re: particle analysis-Feret diameter

Posted by K. Kachrimanis on Nov 27, 2005; 5:09pm
URL: http://imagej.273.s1.nabble.com/particle-analysis-Feret-diameter-tp3704371p3704389.html

> Is the definition you are using the maximun difference in (let's say) the
> x direction, then rotate the particle and find again this difference, and
> measure the length of the particle in the same x directions and so on?
> This would mean that the same particle if analysed by 2 people
> using a different number of rotations would possibly give different
> results.
> Furthermore, I suspect that the true particle longest diameter cannot be
> guaranteed to be found this way either?
>

According to the user manuals, this is the way the Quantimet 500 is calculating the Feret diameter. And you are right, you need to search an infinite number of rotations to make sure that you get the maximum particle dimension. But with a large number of rotations, you stand a good chance of getting an accurate estimate.

Regards,

K.Kachrimanis.