efficient window based computation

Can anyone help me with this. I am looking for a very efficient way to
perform window based matching. I have to pick a window (of say WxW)
around each pixel and then compute some image statistics. I am looking
for some efficient data structure or function or some look up table
approach, other than the dirty way of going through each pixel and
picking a window around it. 

Thanks






Change settings: http://www.yahoogroups.com/mygroups, select
   Get Emails (get all posts)
   Daily Digest (one summary email per day)
   Read on the web (read posts on the web only)Or Unsubscribe by mailing 
OpenCV-unsubscribe@xxxxxxxxxxxxxxx