function to measure the (local) density of 1s in a binary image

[Matteo]

Is there a function in scikit-image to calculate the the local density of 
1s in a binary image?

By local density of 1s I mean:
1) count the number of pixels that have value of 1 in a running/sliding 
window (preferrably circular but square would work too)
2) divide by the total number of pixels in the running window

Thanks
Matteo
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