volume_cog
compute the intensity-weighted center of gravity of a MINC volume
volume_cog volume.mnc [mask.mnc]
DESCRIPTION
volume_cog reads a 3D MINC volume and computes its intensity-weighted center of gravity (COG) in world coordinates. For each voxel, the world coordinate is weighted by the voxel’s intensity value, and the COG is calculated as:
COG = sum(coordinate * intensity) / sum(intensity)
for each of the X, Y, and Z axes.
If an optional mask volume is provided, only voxels that are not masked out are included in the computation.
The three COG coordinates (x, y, z) are printed to standard output.
OPTIONS
This tool uses positional arguments only. There are no named options.
EXAMPLES
Compute the center of gravity of a brain volume:
volume_cog brain.mnc
Compute the center of gravity using a mask:
volume_cog brain.mnc mask.mnc
AUTHOR
Louis Collins - McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University.