ITK/Examples/ImageProcessing/ObjectByObjectLabelMapFilter: Difference between revisions

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==ObjectByObjectLabelMapFilter.cxx==
{{warning|1=The media wiki content on this page is no longer maintained.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.
<source lang="cpp">
}}
#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkImageRegionIterator.h"
#include "itkBinaryImageToLabelMapFilter.h"
#include "itkObjectByObjectLabelMapFilter.h"
#include "itkLabelMapToLabelImageFilter.h"
#include "itkLabelImageToLabelMapFilter.h"
#include "itkScalarToRGBColormapImageFilter.h"
#include "itkConnectedComponentImageFilter.h"


typedef itk::Image<unsigned char, 2>  UnsignedCharImageType;
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
 
typedef itk::RGBPixel<unsigned char>  RGBPixelType;
typedef itk::Image<RGBPixelType, 2>    RGBImageType;
 
static void CreateImage(UnsignedCharImageType::Pointer image);
 
int main(int, char *[])
{
  UnsignedCharImageType::Pointer image = UnsignedCharImageType::New();
  CreateImage(image);
 
  typedef itk::LabelImageToLabelMapFilter<UnsignedCharImageType> LabelImageToLabelMapFilterType;
  LabelImageToLabelMapFilterType::Pointer labelImageToLabelMapFilter = LabelImageToLabelMapFilterType::New();
  labelImageToLabelMapFilter->SetInput(image);
  labelImageToLabelMapFilter->Update();
 
  typedef itk::ConnectedComponentImageFilter <UnsignedCharImageType, UnsignedCharImageType >
    ConnectedComponentImageFilterType;
  ConnectedComponentImageFilterType::Pointer connectedComponentImageFilter
    = ConnectedComponentImageFilterType::New();
 
  typedef itk::ObjectByObjectLabelMapFilter< LabelImageToLabelMapFilterType::OutputImageType > ObjectByObjectLabelMapFilterType;
  ObjectByObjectLabelMapFilterType::Pointer objectByObjectLabelMapFilter = ObjectByObjectLabelMapFilterType::New();
  objectByObjectLabelMapFilter->SetInput( labelImageToLabelMapFilter->GetOutput() );
  objectByObjectLabelMapFilter->SetBinaryInternalOutput(false);
  objectByObjectLabelMapFilter->SetFilter(connectedComponentImageFilter);
  objectByObjectLabelMapFilter->Update();
 
  typedef itk::LabelMapToLabelImageFilter<LabelImageToLabelMapFilterType::OutputImageType, UnsignedCharImageType> LabelMapToLabelImageFilterType;
  LabelMapToLabelImageFilterType::Pointer labelMapToLabelImageFilter = LabelMapToLabelImageFilterType::New();
  labelMapToLabelImageFilter->SetInput(objectByObjectLabelMapFilter->GetOutput());
  labelMapToLabelImageFilter->Update();
 
  // Color each label/object a different color
  typedef itk::ScalarToRGBColormapImageFilter<UnsignedCharImageType, RGBImageType> RGBFilterType;
  RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
  colormapImageFilter->SetInput(labelMapToLabelImageFilter->GetOutput());
  colormapImageFilter->SetColormap( RGBFilterType::Jet );
  colormapImageFilter->Update();
 
  typedef itk::ImageFileWriter< RGBImageType > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetInput( colormapImageFilter->GetOutput() );
  writer->SetFileName("output.png");
  writer->Update();
 
  return EXIT_SUCCESS;
}
 
void CreateImage(UnsignedCharImageType::Pointer image)
{
  // Create a black image with three white squares
  itk::Index<2> start;
  start.Fill(0);
 
  itk::Size<2> size;
  size.Fill(200);
 
  itk::ImageRegion<2> region(start,size);
  image->SetRegions(region);
  image->Allocate();
 
  itk::ImageRegionIterator<UnsignedCharImageType> imageIterator(image,image->GetLargestPossibleRegion());
 
  // Make a region of two disjoint squares
  while(!imageIterator.IsAtEnd())
    {
    if(((imageIterator.GetIndex()[0] > 5 && imageIterator.GetIndex()[0] < 20) &&
      (imageIterator.GetIndex()[1] > 5 && imageIterator.GetIndex()[1] < 20)) ||
      ((imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 60) &&
      (imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 60)) )
      {
      imageIterator.Set(10);
      }
    else if(((imageIterator.GetIndex()[0] > 100 && imageIterator.GetIndex()[0] < 130) &&
    (imageIterator.GetIndex()[1] > 100 && imageIterator.GetIndex()[1] < 130)))
      {
      imageIterator.Set(20);
      }
    else
      {
      imageIterator.Set(0);
      }
 
    ++imageIterator;
    }
 
  // Color each label/object a different color
  typedef itk::ScalarToRGBColormapImageFilter<UnsignedCharImageType, RGBImageType> RGBFilterType;
  RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
  colormapImageFilter->SetInput(image);
  colormapImageFilter->SetColormap( RGBFilterType::Jet );
  colormapImageFilter->Update();
 
  typedef  itk::ImageFileWriter< RGBImageType  > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("input.png");
  writer->SetInput(colormapImageFilter->GetOutput());
  writer->Update();
 
}
 
</source>
 
{{ITKCMakeLists|ObjectByObjectLabelMapFilter}}

Latest revision as of 22:08, 30 May 2019

Warning: 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.

[ITK Sphinx Examples]