mincblob man page on DragonFly
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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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