Estimates the value at which to clip the anatomical dataset using
3dClipLevel so that background regions are set to zero.
afni_3dClipLevel(file, mfrac = 0.5, opts = "")
ClipLevel(...)| file | nifti object or NIfTI filename. If more than one is given,
they are given names of the letters up to |
|---|---|
| mfrac | Multiplier of the median for clipping (see notes) |
| opts | Additional options passed to |
| ... | not used |
Single character string of a nubmer
(by default), unless opts = "-doall"
From AFNI docs: Algorithm:
(a) Set some initial clip value using wizardry (AKA 'variance').
(b) Find the median of all positive values >= clip value.
(c) Set the clip value to mfrac of this median.
(d) Loop back to (b) until the clip value doesn't change.