patch geometry

Hi!

I am looking for a package that can give me a patch geometry (mean
size, standard deviation, ...) from a land use/cover dataset in raster
format, in R.
Similar to what FRAGTSAT does.

I've found a while ago a post in this forum concerning this same
request, however I am not able to find it again or to remember the
name of the package recommended.

Can someone help me out?

Many thanks !!