scenePad

Pad the data in an optical image with zeros, usually prior to applying OTF

     oi = scenePad(oi,padSize)

 For optics calculations we need to pad the size (to avoid edge wrapping).
 Here we pad the spatial dimensions and adjust the horizontal field of
 view accordingly.

 Yes, I know, this should be called oiPad.  Will change some day.
   
 Example:
   oi = scenePad(oi,[8,8,0]);

 Copyright ImagEval Consultants, LLC, 2003.