subsample - Subsample a volume integral factor  

1997 Ulrik Kjems, DSP/IMM, Technical University of Denmark, uk@imm.dtu.dk
Use : 
  subsample <options> inputfile outputfile 

Subsamples a volume by an integral factor. Subsampling means picking every
n'th voxel out out the original volume. To void aliasing noise, the volume
is preblurred using a sinc-kernel. 

Options are:

 -f factorx..z : Specify subsampling factor
 -s sinc_size  : Specify sinc kernel size in units of the
                 output voxel size. Should be an odd number. Default is 7.


 -i level      : Spec. report level (DEBUG, STD, INFO, QUIET)

subsample -h produces above information