fast_blur

Fast Gaussian blurring of a MINC volume.

fast_blur [options] <input> <output>

DESCRIPTION

fast_blur performs fast Gaussian blurring on a MINC volume. The blurring kernel is specified by its full width at half maximum (FWHM) in millimeters. Different FWHM values can be set independently for each spatial axis. In addition to simple blurring, the tool can compute first-order spatial derivatives, the gradient vector field, or the gradient magnitude.

OPTIONS

--clobber

Overwrite existing output files.

--verbose

Print progress information during processing.

--fwhm f

Set the global Gaussian FWHM in millimeters, applied equally to all axes.

--fwhm_x fx

Set the Gaussian FWHM in millimeters for the X axis.

--fwhm_y fy

Set the Gaussian FWHM in millimeters for the Y axis.

--fwhm_z fz

Set the Gaussian FWHM in millimeters for the Z axis.

--dx

Compute the first derivative (differentiate) along the X axis.

--dy

Compute the first derivative (differentiate) along the Y axis.

--dz

Compute the first derivative (differentiate) along the Z axis.

--grad

Calculate the gradient vector field. The output will be a vector volume with components for each spatial direction.

--gmag

Calculate the gradient magnitude (scalar).

--float

Write output in floating-point format.

EXAMPLES

Blur a volume with 4 mm FWHM:

fast_blur --fwhm 4 input.mnc blurred.mnc

Compute gradient magnitude with 2 mm FWHM smoothing:

fast_blur --fwhm 2 --gmag input.mnc gradient_mag.mnc

Blur with different widths per axis:

fast_blur --fwhm_x 2 --fwhm_y 4 --fwhm_z 6 input.mnc blurred.mnc

AUTHOR

Vladimir S. Fonov - McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University.

COPYRIGHTS

Copyright © 2011 by Vladimir S. Fonov

SEE ALSO

mincblur