OrthoProjection

MLModule

genre	Resample
author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLGeometry1
definition	MLGeometry1.def
see also	Resample3D, OrthoSwapFlip, SubImageStatistics
keywords	max, min, add, mip, stddev, variance, argmax

Purpose

The module OrthoProjection projects a volume dataset along a given dimension using a specific function.

Details

If a dimension is chosen whose extension is 1, nothing is done. (For standard deviation or variance mode, the output will be marked invalid, since a variance estimation needs more than one value.)

For add mode, the image’s minimum and maximum voxel values and the output datatype are adjusted in order to prevent overflows. Unsigned datatypes are preferred in this case.

For the stdDev and var modes, the output image type will be a floating point type, and the image’s minimum is set to zero, but the maximum cannot be properly estimated. So, do not rely on the maximum value in these modes!

Windows

Default Panel

Parameter Fields

Visible Fields

Dimension

name: dimension, type: Enum, default: z

Defines the image dimension in which the projection is performed.

Values:

Title	Name
x	x
y	y
z	z
c	c
t	t
u	u

Mode

name: mode, type: Enum, default: max

The projection mode determines how the target value is computed from the N source values along the projected dimension. Also, the output type and the stored min/max are affected by some modes, as noted in the table below.

Values:

Title	Name	Description
max	max	Maximum of all source values
min	min	Minimum of all source values
add	add	Sum of all source values (promoted type)
mean	mean	Arithmetic mean of all source values, i.e. sum divided by N (type is not changed)
max Pos	maxPos	Integer voxel coordinate of the maximum value along projected dimension
min Pos	minPos	Integer voxel coordinate of the minimum value along projected dimension
std Dev	stdDev	Standard deviation of all source values, i.e. square root of variance (floating point type)
var	var	Unbiased estimate of the variance of all source values (floating point type)