convolvecirc

  Performs 2D circular convolution 

  Y = convolvecirc(X,h) 
 
  The matrix h (kernel) is convolved with the matrix X. The result has the
  same size as X. There is probably a Matlab circular convolution by now
  in the image processing toolbox. 

  It is assumed that both the row dimension and column dimension  of h do
  not exceed those of X.  The result is the same as zero-padding h out to
  the size of X,  and then computing the convolution X*h.

 Copyright ImagEval Consultants, LLC, 2003.