[-P] [-n] [-g] [-d] [-p#] [-r#] [-t#]
      [< input object >]
      Options:
      -h Prints this usage information
      -o Output object file name.
      -a Filter feed forward parameters.
      -b Filter feed back parameters.
      -c Filter normalization parameter.
      -P Print filter parameters to the standard output.
      -n Dont filter object.
      -g Use approximate Gaussian filter.
      -d Use Deriche filter.
      -p Filter parameter for Gaussian (sigma) and Deriche (alpha) filters
      -r Order of derivative for Gaussian and Deriche filters [0-2].
      -t Filter directions, eg x filter along lines and x,y filter
            along lines then through columns.
      Applies a recursive filter to a Woolz domain object with grey values.
      The input object is read from stdin and the filtered object is
      written to stdout unless the filenames are given.
      Example: WlzRsvFilterObj -g -p 2.0 -r 0 -t y -o smoothed.wlz in.wlz
      The input Woolz object is read from in.wlz, and filtered using a
      Gaussian filter with varience = 2.0. The is only applied through
      the objects columns. The filtered object is then written to
      smoothed.wlz.
      Objects with unsigned byte grey values will be promoted to short
      grey valued objects.