Threshold

MLModule

genre	Segmentation
author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLMiscModules
definition	MLMiscModules.def
see also	IntervalThreshold, RegionGrowing
keywords	Segmentation

Purpose

The module Threshold applies a relative or absolute threshold to a voxel image. It can be defined what should be written to those voxels that pass or fail the adjustable comparison.

Details

The module may change the min/max value and the data type of the output image.

If any value to be written is of floating-point type and the input image is of integer type, the output image will be of floating-point type.

If any value to be written exceeds the min/max values of the input image, the output image’s min/max values are adjusted so that all written values fall within the min/max range.

If the new min/max range of the output image exceeds the data type’s range, the data type is adjusted to the smallest type that can accommodate the new min/max range.

Windows

Default Panel

Input Fields

input0

name: input0, type: Image

Output Fields

output0

name: output0, type: Image

Parameter Fields

Field Index

Comparison: Enum

Threshold: Double

Use relative threshold: Bool

User Value (userConditionTrueValue): Double

User Value (userConditionFalseValue): Double

Write (conditionTrueWriteValue): Enum

Write (conditionFalseWriteValue): Enum

Visible Fields

Threshold

name: threshold, type: Double, default: 0, deprecated name: Threshold

Sets a threshold value, either as an absolute gray value or a relative value.

Use relative threshold

name: relativeThreshold, type: Bool, default: FALSE, deprecated name: RelativeThreshold

If checked, the threshold is interpreted as a value relative to the min/max range of the image.

Comparison

name: comparisonOperator, type: Enum, default: Greater

Defines the comparison operator that is applied to test each input voxel value against the Threshold.

Values:

Title	Name
​<	​Less
​<=	​LessEqual
​==	​Equal
​!=	​NotEqual
​>	​Greater
​>=	​GreaterEqual

Write (conditionTrueWriteValue)

name: conditionTrueWriteValue, type: Enum, default: UserDef

Defines which value is written to the output image for input voxels that pass the comparison.

Values:

Title	Name	Description
​Img Min	​ImgMin	​The input image’s minimum value is written.
​Img Max	​ImgMax	​The input image’s maximum value is written.
​Img Orig	​ImgOrig	​The input image’s original voxel value is written.
​Img Max Minus Img Orig	​ImgMaxMinusImgOrig	​The input image’s maximum value minus the original value is written.
​User Def	​UserDef	​The user defined value set in User Value is written.
​Threshold	​Threshold	​The Threshold’s absolute value is written.

User Value (userConditionTrueValue)

name: userConditionTrueValue, type: Double, default: 1

Sets a user value that is written if so chosen in Write.

Write (conditionFalseWriteValue)

name: conditionFalseWriteValue, type: Enum, default: UserDef

Defines which value is written to the output image for input voxels that fail the comparison.

Values:

Title	Name	Description
​Img Min	​ImgMin	​The input image’s minimum value is written.
​Img Max	​ImgMax	​The input image’s maximum value is written.
​Img Orig	​ImgOrig	​The input image’s original voxel value is written.
​Img Max Minus Img Orig	​ImgMaxMinusImgOrig	​The input image’s maximum value minus the original value is written.
​User Def	​UserDef	​The user defined value set in User Value is written.
​Threshold	​Threshold	​The Threshold’s absolute value is written.

User Value (userConditionFalseValue)

name: userConditionFalseValue, type: Double, default: 0

Sets a user value that is written if selected in Write.