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MINCBLOB(1)		       MINC User's Guide		   MINCBLOB(1)

NAME
       mincblob - calculate blobs from minc deformation grids

SYNOPSIS
       mincblob [<options>] <in1>.mnc

DESCRIPTION
       mincblob	 will  calculate simple statistical metrics of a minc deforma‐
       tion grid file related to local volume change.  The  input  deformation
       grid files are typically produced by minctracc.

       There  are  currently 4 deformation grid metrics to choose from: trace,
       determinant, translation and magnitude. The first two relate to differ‐
       ent estimates of local volume change the third is a measure of how con‐
       sistent movement is in a direction but without a local change  in  vol‐
       ume.  The last calcuates the magnitude of the local deformation vector.
       These metrics are all calculated with respect to	 a  vectors  immediate
       neighbours. No smoothing of the field is performed as part of this cal‐
       culation so if a smooth results is desired input grid files  should  be
       first smoothed or blurred.

OPTIONS
       Note that options can be specified in abbreviated form (as long as they
       are unique) and can be given anywhere on the command line.

General options
       -clobber
	      Overwrite an existing file.

       -noclobber
	      Don't overwrite an existing file (default).

       -verbose
	      Print out extra information (more than the default).

	      -trace Compute the  areas	 within	 the  deformation  field  that
	      equate  to  volume  increase  or	decrease (+ve or -ve dilation)
	      Dilation is defined as the trace of the deformation  field  Thus
	      it  should  range	 between -1..1 with -1 being compression and 1
	      being dilation. This measure while fast is essentially a sum  of
	      partial derivatives in all three directions.

       -determinant
	      This  computes  the same metric as -trace but with greater accu‐
	      racy as the local Jacobian matrix is first estimated. The	 first
	      order determinant of the Jacobian is then returned.

       -translation
	      Compute  the  areas  within the deformation field that equate to
	      translation Translation is defined as: trans  =  arccos(	A.B  /
	      |A|.|B| ) * e^- (|A|-|B|) Thus it should range between 0..1 with
	      1 being "translation".

       -magnitude
	      Compute the magnitude of the local deformation vector.

Generic options for all commands:
       -help  Print summary of command-line options and exit.

       -version
	      Print the program's version number and exit.

AUTHOR
       Andrew Janke

COPYRIGHTS
       Program: Copyright © 2000 by Andrew Janke

       Man page: Copyright © 2001 by Peter Neelin

			 $Date: 2004-05-20 21:52:09 $		   MINCBLOB(1)

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