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| <div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestSigmoidImageFilter.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions. |
| This example passes every pixel in an image through a Sigmoid function. The output displays the input image and the filtered image.
| | }} |
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| Please see the ITK Software Guide for a qualitative description of how Alpha and Beta affect the filter.
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| | |
| ==SigmoidImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkSigmoidImageFilter.h"
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| #include "QuickView.h"
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| int main(int argc, char *argv[])
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| {
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| if(argc < 2)
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| {
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| std::cerr << "Usage: ";
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| std::cerr << argv[0] << " inputImageFile [alpha] [beta]" << std::endl;
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| return EXIT_FAILURE;
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| }
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| | |
| double alpha = 5.0;
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| double beta = 10.0;
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| if (argc > 2)
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| {
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| alpha = atof(argv[2]);
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| }
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| if (argc > 3)
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| {
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| beta = atof(argv[3]);
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| }
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| | |
| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| typedef itk::SigmoidImageFilter <ImageType, ImageType>
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| SigmoidImageFilterType;
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| SigmoidImageFilterType::Pointer sigmoidFilter
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| = SigmoidImageFilterType::New();
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| sigmoidFilter->SetInput(reader->GetOutput());
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| sigmoidFilter->SetOutputMinimum(0);
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| sigmoidFilter->SetOutputMaximum(255);
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| sigmoidFilter->SetAlpha(alpha);
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| sigmoidFilter->SetBeta(beta);
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|
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| QuickView viewer;
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| viewer.AddImage(
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| reader->GetOutput(),true,
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| itksys::SystemTools::GetFilenameName(argv[1]));
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| std::stringstream desc;
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| desc << "SigmoidImageFilter\nalpha = " << alpha
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| << " beta = " << beta;
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| viewer.AddImage(
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| sigmoidFilter->GetOutput(),
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| true,
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| desc.str());
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| viewer.Visualize();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| {{ITKVTKCMakeLists|SigmoidImageFilter|}}
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