Frei-Chen Edge Detector

[Umesh Sharma]

Hi ,

I have  implemented  frei-chen edge detector .
Here is the link 
https://github.com/umesh563/scikit-image/blob/master/skimage/filter/edges.py

I am working on testing of this algorithm . 
Please review the code and tell me if i need to make any other changes on 
this part .


Regrads,
Umesh 
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