Usage: WlzHistogramFindPeaks [-h] [-o< out file >] [-f #] [-s#] [-t#] [< in object >]
      Options:
      -o Output data file name.
      -f Features to find, either p (peak), t (trough) or p,t (both).
      -s Gaussian sigma (standard deviation).
      -t Threshold value for peak height.
      -h Help, prints this usage message.
      Finds the positions of histogram peaks.
      Objects/data are read from stdin and written to stdout unless the
      filenames are given.