URGENT: borders of warped images

Hi,
   
  I'm generating new view from an initial image using Affine Transformations. 
I'm also detecting feature points using cvGoodFeaturesToTrack in the new view 
(warped image). Then I need to save small parts of 32x32 pixels centered each 
on the detected feature points except those near the borders of the warped 
image as we cannot define a rectangle of 32x32 pixels around them.
   
  So I have a couple of questions:
   
  1) How can I identify the pixels that have distance of 32 pixels from the 
borders of the warped image (not the windows).
   
  2) how to get the width and height of the warped image (it is not a 
rectangle) it is a quadrilateral.
   
  Thank you,
  -Fadi

                
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