Thanks Juan. Ya I had read that, sorry to make you post the source link. I guess I just wanted to confirm that what I was seeing made sense and was a product of the drawing routine rather than some sort of error or misinterpretation. On Monday, February 17, 2014 9:32:20 PM UTC-5, Juan Nunez-Iglesias wrote:

Adam,

On Tue, Feb 18, 2014 at 12:40 PM, Adam Hughes <hughes...@gmail.com<javascript:>

...

wrote:

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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/_re...

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

Juan.