``volume properties'' - Compute various properties of a volume

VFX name:

iVolProperties

IMPROMPTU Equivalent:

Volume_properties

purpose:

Compute the value of some volume property. The following quantities can be computed:

1.

mean int. - mean grayscale value of voxels in the volume

2.

voxel count - # of voxels > a specified grayscale cutoff

3.

std. dev. - grayscale standard deviation of voxels in the volume

The function ``voxel count'' is useful for counting up the number of nonzero voxels in a volume (set ``intensity cutoff = 1'').

input:

An 8-bit volume.

output:

A screen message giving the value of the volume property.

parameters:

Default parameters menu is

function = std_dev
intensity_cutoff = 0

The parameter ``function = '' toggles between the names listed above under purpose.

The ``intensity_cutoff = '' parameter (in graylevels) only applies to the option ``function = voxel count''.

comments:

1.

A fast function.

2.

This function, since it outputs screen messages, can only be used in menu mode.

3.

Slice sizes up to 1024x1024 can be handled.