Radius-scale matching in Determinant of Hessian (DoH) blob detector

[Iakovos Halegoua]

Hello there, 

I'd like to point out to the documentation authors a minor error in the 
blob_doh 
<http://scikit-image.org/docs/dev/api/skimage.feature.html#blob-doh> 
description. In the Notes section it is stated that: "The radius of each 
blob is approximately sigma.". 
As I tested the DoH responses of synthetic blob images, it seemed that the 
radius of the blob is matched to the scale according to: r = sqrt(2) * s. 
Could you provide me with some reference on how you calculated the matching 
scale to be at r = s? I guess this is nothing serious, but it was a little 
confusing when I first encountered it :P 
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