usage: -expr [NREPTS] [static] erode val maskbits newval flag nmatch nneighbors

VAL - “Inside” value (or Percent value if (FLAG & (4|8))
MASKBITS - voxel data values to consider for comparing with VAL (DATABITS is inverse of MASKBITS)
NEWVAL - bit-value to turn on when adding (dilating) a voxel. If NEWVAL is negative and MASKBITS is zero, then the input data voxel value will be used when dilating into neighboring voxels.

FLAG:

• 0 - (default)
• 1 -
• 2 - erode/dilate in 2-D plane only
• 4 - Stop on dark edge (voxel darker than (100-VAL1)% of inside neighbors (Needs MASKBITS set)
• 8 - Stop on bright edge (brighter than (100+VAL1)% of inside neighbors

See Also:
DILATE, FLOOD, THRESHOLD, Segmentation

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