On Dec 21, 2:02 pm, Stéfan van der Walt <ste...@sun.ac.za> wrote: ...

I don't like having background == 0, but I'll settle for background == -1 as a default.

Thanks!

...

Regarding connectedness, both matlab and ndimage have options of 8- connect and 4-connect. ...

That's been added in the patch I proposed.

Thanks!!

...

Regarding number of labeled regions (not counting the background regions), again matlab and ndimage compute and return it. ...

This is a one-liner: len(np.unique(labels))

Or, len(np.unique(labels)) - 1, if we do not count the background in. I tend to think that is a norm when we consider the background special. Yet who cares if the output does not include the number of regions. Regards, TJ