Brain Imaging & Analysis Center

usage: -expr dilate 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

If MASKBITS is non-zero, it is used to mask both the input data values and NEWVAL; only those data bits are considered during comparisons and only the NEWVAL bits are changed during dilation.

If NEWVAL is negative and MASKBITS is zero, then the input data voxel value will be used when dilating into neighboring voxels.

See Also:
ERODE, FLOOD,

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