Adam,


On Tue, Feb 18, 2014 at 12:40 PM, Adam Hughes <hughesadam87@gmail.com> wrote:
would you know which perimeter of the methods you listed would be returned by region_props?

The region_props documentation describes it pretty well:

**perimeter** : float
    Perimeter of object which approximates the contour as a line
    through the centers of border pixels using a 4-connectivity.

Nothing is more precise than code though:
https://github.com/scikit-image/scikit-image/blob/master/skimage/measure/_regionprops.py#L521

Maybe this is not the right way to do it. As you mentioned, circularity should probably converge to 1. 

Juan.