AFNI program: 3dLocalUnifize
Output of -help
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OVERVIEW ~1~
This program takes an input and generates a simple "unifized" output
volume. It estimates the median in the local neighborhood of each
voxel, and uses that to scale each voxel's brightness. The result is
a new dataset of brightness of order 1, which still has the
interesting structure(s) present in the original.
This program's output looks very useful to help with dataset alignment
(esp. EPI-to-anatomical) in a wide array of cases.
ver : 1.2
date : Jan 29, 2024
auth : PA Taylor (SSCC, NIMH, NIH)
USAGE ~1~
This program is generally run as:
3dLocalUnifize [options] -prefix DSET_OUT -input DSET_IN
where the following options exist:
-input DSET_IN :(req) input dataset
-prefix DSET_OUT :(req) output dataset name, including path
-wdir_name WD :name of temporary working directory, which
should not contain any path information---it will be
created in the same directory as the final dataset
is created
(def: __wdir_LocalUni_, plus a random alphanumeric str)
-echo :run this program very verbosely (def: don't do so)
-no_clean :do not remove the working directory (def: remove it)
... and the following are 'tinkering' options, likely not needed in
most cases:
-local_rad LR :the spherical neighborhood's radius for the
3dLocalStat step (def: -3)
-local_perc LP :the percentile used in the 3dLocalStat step,
generating the scaling volume
(def: 50)
-local_mask LM :provide the masking option to be used in the
3dLocalStat step, which should be enclosed in
quotes for passing along to the internal
program call. So, to use a pre-existing mask,
you might call this option like:
-local_mask "-mask my_mask.nii.gz"
To remove any masking, put the special keyword
"None" as the option value.
(def: "-automask")
-filter_thr FT :put a ceiling on values in the final, scaled dataset,
whose values should be of order 1; setting FT to be a
value <=0 turns off this final filtering
(def: 1.5)
NOTES ~1~
This program is designed to not need a lot of tinkering with
options, such as the '-local_* ..' ones. In most cases, the default
scaling will be useful.
EXAMPLES ~1~
1. Basic local unifizing:
3dLocalUnifize \
-prefix vr_base_LU \
-input vr_base_min_outlier+orig.HEAD
1. Same as above, without masking:
3dLocalUnifize \
-prefix vr_base_LU_FOV \
-input vr_base_min_outlier+orig.HEAD \
-local_mask None
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Tue Dec 17 06:53:02 PM EST 2024