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--- jvs:fscan:manual:chapter2:expression:dilate [2012/06/04 21:31]
voyvodic
+++ jvs:fscan:manual:chapter2:expression:dilate [2023/02/23 18:43] (current)
@@ Line 3: / Line 3: @@
  **usage:  -expr dilate val maskbits newval flag nmatch nneighbors**\\
-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.
+  * 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 neighboring data voxel values will be used when dilating into "empty" voxels.
-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)
+    * 2 - Erode/dilate in 2-D plane only
+    * 4 - Stop on dark edge (voxel darker than (100-VAL)% of inside neighbors (Needs MASKBITS set)
+    * 8 - Stop on bright edge (brighter than (100+VAL)% of inside neighbors
+    * 16 - Dilate all non-zero values except VAL (useful for filling in around VAL areas)
+  * NMATCH - number of adjacent voxels matching criterion needed for dilation (default=1)
+  * NNEIGHBORS - number of neighboring voxels to consider (default=26 if 3D, 8 if 2D)
+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.
 **See Also:**\\

Brain Imaging & Analysis Center

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