[Numpy-discussion] finding connected areas?

Alexandre Fayolle alexandre.fayolle at logilab.fr
Tue Jun 13 02:31:54 CDT 2006


On Tue, Jun 13, 2006 at 01:41:17AM +0100, stephen emslie wrote:
> I have used adaptive thresholding to turn an image into a binary image
> so that I can locate a particularly large bright spot. However, now
> that I have the binary image I need to be able to group connected
> cell's together and determine their relative sizes. Matlab has a
> function called bwlabel (http://tinyurl.com/fcnvd) that labels
> connected objects in a matrix. That seems like a good way to start,
> and I'm sure there is a way for me to do something similar in numpy,
> but how?

You will get this in numarray.nd_image, the function is
called label. It is also available in recent versions of scipy, in
module scipy.ndimage. 

-- 
Alexandre Fayolle                              LOGILAB, Paris (France)
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