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

Vighnesh Birodkar vighneshbirodkar at gmail.com
Sun Nov 29 01:31:37 EST 2015


Hello

Could you provide an image and short code example ? If that it not the case 
then the unit tests would fail
https://github.com/scikit-image/scikit-image/blob/master/skimage/feature/tests/test_blob.py

Thanks
Vighnesh

On Monday, November 23, 2015 at 1:21:39 PM UTC-5, Iakovos Halegoua wrote:
>
> 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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