Usage: WlzScalarFeatures [-o< out file >] [-h] [-H] [-L] [-a] [-v#] [-d#]
      [-t< feature type >] [-f#] [< in object >]
      Extracts scalar features from Woolz domain objects. These features
      are separated by a minimum distance and are either maximal or minimal
      within a region (which approximates to the Vorinoi cell) containing
      the feature.
      Options are:
      -o Output file name, set to < stdout >.
      -h Display this usage information.
      -H Feature values will be at or above the threshold value, set.
      -L Feature values will be below threshold value, not set.
      -a Compute a threshold value automatically, not set.
      -v Specified threshold value, set to 128.
      -d Minimum distance between features, set to 20.
      -t Type of feature, valid types are "value" and "grad", set
            to WLZ_SCALARFEATURE_VALUE.
      -f Filter value for feature extraction, set to 1