MedicalVisualization

Thresholding with ITK

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Simple thresholding example:

https://itk.org/ITKExamples/src/Filtering/Thresholding/ThresholdAnImage/Documentation.html

The threshold filter compares the input image with a threshold and replaces the image pixels which are below the threshold with an outside color (black by default).

#include "itkThresholdImageFilter.h"

// create threshold filter
typedef itk::ThresholdImageFilter<Image3DType> ThresholdImageFilterType;
ThresholdImageFilterType::Pointer thresholdFilter = ThresholdImageFilterType::New();

// filter settings
thresholdFilter->ThresholdBelow(200);
thresholdFilter->SetOutsideValue(0);

// connect input of filter to output of reader
thresholdFilter->SetInput(reader->GetOutput());

// pull the pipeline at its end
thresholdFilter->Update();
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without thresholding with thresholding
without thresholding with thresholding

Histogram-based thresholding example:

http://itk.org/ITKExamples/src/Filtering/Thresholding/ThresholdAnImageUsingOtsu/Documentation.html

Other intensity filters:

  • itk::BinaryThresholdImageFilter
  • itk::IntensityWindowingImageFilter
  • itk::RescaleIntensityImageFilter
  • itk::SigmoidImageFilter


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