**fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): segment**
===== segment -- Assign contiguous voxels with similar values to different clusters =====
 **usage:  -expr segment [flag value]**\\

The SEGMENT command process a 3-D image map looking for voxel values greater than or equal to VALUE.  Each time it finds such a voxel it uses a variation of the [[jvs:fscan:manual:chapter2:expression:flood|flood]] function to find all other voxels greater than VALUE contiguous with the first, and assigns all those values a new "cluster" number.  Clusters can have as few as 1 voxel. Cluster values start at 1, and increase by 1 for each new cluster found.

VALUE: default is 1

FLAG:\\
 0 - default\\
 1 - also look for negative voxel values, less than or equal to -VALUE (default is just positive)
 
**See Also:**\\
[[jvs:fscan:manual:chapter2:expression:flood|Flood]],
[[jvs:fscan:manual:chapter2:expression:peak|Peak]]

[[jvs:fscan|fScan Home]], 
[[jvs:fscan:manual|fScan Manual]], 
[[jvs:fscan:manual:chapter2|CmdLineOptions]], 
[[jvs:fscan:manual:chapter2:expression|Expression Command]], 
[[jvs:fscan:manual:help|Manual Help]]