[GRASS-user] Segmentation....

Hi list,

In http://www.grass.itc.it/grass62/manuals/html62_user/imageryintro.html,

It says…

“Single and multispectral data can be classified to user defined land use/land cover classes. In case of a single channel, segmentation will be used.”

The question is: How can I perform a single chanel unsupervised image segmentation?
If not with Grass, wich is the best open-source option?

Thanks in advise.

Leonardo Hardtke