9.25. ITK Double Threshold Image Filter

Binarize an input image using double thresholding.

Group (Subgroup)

ITKMathematicalMorphology (MathematicalMorphology)

Description

Double threshold addresses the difficulty in selecting a threshold that will select the objects of interest without selecting extraneous objects. Double threshold considers two threshold ranges: a narrow range and a wide range (where the wide range encompasses the narrow range). If the wide range was used for a traditional threshold (where values inside the range map to the foreground and values outside the range map to the background), many extraneous pixels may survive the threshold operation. If the narrow range was used for a traditional threshold, then too few pixels may survive the threshold.

Double threshold uses the narrow threshold image as a marker image and the wide threshold image as a mask image in the geodesic dilation. Essentially, the marker image (narrow threshold) is dilated but constrained to lie within the mask image (wide threshold). Thus, only the objects of interest (those pixels that survived the narrow threshold) are extracted but the those objects appear in the final image as they would have if the wide threshold was used.

GrayscaleGeodesicDilateImageFilter
[MorphologyImageFilter , GrayscaleDilateImageFilter , GrayscaleFunctionDilateImageFilter ,](https://itk.org/Doxygen/html/classitk_1_1MorphologyImageFilter , GrayscaleDilateImageFilter , GrayscaleFunctionDilateImageFilter ,.html)BinaryDilateImageFilter

Input Parameter(s)

Parameter Name	Parameter Type	Parameter Notes	Description
Threshold1	Scalar Value	Float64	Set the thresholds. Four thresholds should be specified. The two lower thresholds default to NumericTraits::NonpositiveMin() . The two upper thresholds default NumericTraits::max . Threshold1 <= Threshold2 <= Threshold3 <= Threshold4.
Threshold2	Scalar Value	Float64	Set the thresholds. Four thresholds should be specified. The two lower thresholds default to NumericTraits::NonpositiveMin() . The two upper thresholds default NumericTraits::max . Threshold1 <= Threshold2 <= Threshold3 <= Threshold4.
Threshold3	Scalar Value	Float64	Set the thresholds. Four thresholds should be specified. The two lower thresholds default to NumericTraits::NonpositiveMin() . The two upper thresholds default NumericTraits::max . Threshold1 <= Threshold2 <= Threshold3 <= Threshold4.
Threshold4	Scalar Value	Float64	Set the thresholds. Four thresholds should be specified. The two lower thresholds default to NumericTraits::NonpositiveMin() . The two upper thresholds default NumericTraits::max . Threshold1 <= Threshold2 <= Threshold3 <= Threshold4.
Inside Value	UInt8		Set the ‘inside’ pixel value. The default value NumericTraits::max()
Outside Value	UInt8		Set the ‘outside’ pixel value. The default value NumericTraits::ZeroValue() .
Fully Connected	Bool		Set/Get whether the connected components are defined strictly by face connectivity or by face+edge+vertex connectivity. Default is FullyConnectedOff. For objects that are 1 pixel wide, use FullyConnectedOn.

Input Cell Data

Parameter Name	Parameter Type	Parameter Notes	Description
Image Geometry	Geometry Selection	Image	Select the Image Geometry Group from the DataStructure.
Input Cell Data	Array Selection	Allowed Types: int8, uint8, int16, uint16, int32, uint32, int64, uint64, float32, float64	The image data that will be processed by this filter.

Output Cell Data

Parameter Name	Parameter Type	Parameter Notes	Description
Output Image Data Array	DataObjectName		The result of the processing will be stored in this Data Array.

Example Pipelines

License & Copyright

Please see the description file distributed with this plugin.

DREAM3D Mailing Lists

If you need help, need to file a bug report or want to request a new feature, please head over to the DREAM3DNX-Issues GitHub site where the community of DREAM3D-NX users can help answer your questions.