DragonFly On-Line Manual Pages

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
       deformation 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
       different estimates of local volume change the third is a measure of
       how consistent movement is in a direction but without a local change in
       volume. 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 calculation 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
              accuracy 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 (C) 2000 by Andrew Janke

       Man page: Copyright (C) 2001 by Peter Neelin

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