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From: "Farwa Bat" <farwa@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Image filters,Edge detectors
Date: Tue, 8 Jan 2008 15:14:03 +0000 (UTC)
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Hi,in matlab for edge detection sobel,prewit,etc are 
available,using edge command.There is also filter2,and 
conv2 using fspecial command same sobel ,prewit are used.
Why and When I shpuld use 

1)edge command and find edges.
2)filter2 or conv2 for same classical filter
(Sobel,Prewit...etc).
Plz explain the difference in detail because most of these 
are used as edge detectors.