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| <div class="floatcenter">[[File:ITK_Examples_Baseline_Segmentation_TestOtsuMultipleThresholdsImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | }} |
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|
| ==OtsuMultipleThresholdsImageFilter.cxx==
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| | |
| <source lang="cpp">
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| | |
| #include "itkImage.h"
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| #include "itkOtsuMultipleThresholdsImageFilter.h"
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| #include "itkImageFileReader.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkNumericTraits.h"
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| #include "itkLabelToRGBImageFilter.h"
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| | |
| #include "itksys/SystemTools.hxx"
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| #include <sstream>
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| | |
| #include "QuickView.h"
| |
| | |
| typedef unsigned char PixelType;
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| typedef itk::Image<PixelType, 2> ImageType;
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| typedef itk::RGBPixel<unsigned char> RGBPixelType;
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| typedef itk::Image<RGBPixelType, 2> RGBImageType;
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| | |
| | |
| static void CreateImage(ImageType::Pointer image);
| |
| | |
| int main(int argc, char *argv[])
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| {
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| unsigned int numberOfThresholds = 1;
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| ImageType::Pointer image;
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| if( argc < 2 )
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| {
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| image = ImageType::New();
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| CreateImage(image.GetPointer());
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| }
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| else
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| {
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader =
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| ReaderType::New();
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| reader->SetFileName(argv[1]);
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| reader->Update();
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| if (argc > 2)
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| {
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| numberOfThresholds = atoi(argv[2]);
| |
| }
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| image = reader->GetOutput();
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| }
| |
| | |
| typedef itk::OtsuMultipleThresholdsImageFilter <ImageType, ImageType>
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| FilterType;
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| FilterType::Pointer otsuFilter
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| = FilterType::New();
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| otsuFilter->SetInput(image);
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| otsuFilter->SetNumberOfThresholds(numberOfThresholds);
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| otsuFilter->Update(); // To compute threshold
| |
| | |
| typedef itk::LabelToRGBImageFilter<ImageType, RGBImageType> RGBFilterType;
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| RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
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| colormapImageFilter->SetInput(otsuFilter->GetOutput());
| |
| | |
| QuickView viewer;
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| viewer.AddImage(
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| image.GetPointer(),true,
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| argc > 1 ? itksys::SystemTools::GetFilenameName(argv[1]) : "Generated image");
| |
| | |
| std::stringstream desc;
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| desc << "Otsu Threshold\n"
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| << otsuFilter->GetNumberOfThresholds()
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| << " thresholds: ";
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| FilterType::ThresholdVectorType thresholds = otsuFilter->GetThresholds();
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| for (unsigned int i = 0; i < thresholds.size(); i++)
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| {
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| desc << itk::NumericTraits<FilterType::InputPixelType>::PrintType(thresholds[i]) << " ";
| |
| }
| |
| | |
| viewer.AddRGBImage(
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| colormapImageFilter->GetOutput(),
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| true,
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| desc.str());
| |
| | |
| viewer.Visualize();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void CreateImage(ImageType::Pointer image)
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| {
| |
| // Create an image
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| ImageType::IndexType start;
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| start.Fill(0);
| |
| | |
| ImageType::SizeType size;
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| size.Fill(100);
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| ImageType::RegionType region;
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| region.SetSize(size);
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| region.SetIndex(start);
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| | |
| image->SetRegions(region);
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| image->Allocate();
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| | |
| // Make the whole image white
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| itk::ImageRegionIterator<ImageType> iterator(image,image->GetLargestPossibleRegion());
| |
| | |
| /*
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| //Create a square
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| while(!iterator.IsAtEnd())
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| {
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| iterator.Set(255);
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| ++iterator;
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| }
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| */
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| }
| |
| </source>
| |
| {{ITKVTKCMakeLists|{{SUBPAGENAME}}}}
| |
