ITK/Examples/ImageProcessing/ShapeOpeningLabelMapFilter: Difference between revisions

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==ShapeOpeningLabelMapFilter.cxx==
{{warning|1=The media wiki content on this page is no longer maintainedThe examples presented on the https://itk.org/Wiki/*  pages likely require ITK version 4.13 or earlier releasesIn 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 "itkBinaryImageToShapeLabelMapFilter.h"
#include "itkShapeOpeningLabelMapFilter.h"
#include "itkLabelMapToLabelImageFilter.h"
#include "itkScalarToRGBColormapImageFilter.h"
 
typedef itk::Image<unsigned char, 2> ImageType;
typedef itk::Image<unsigned char, 2>  LabelImageType;
static void CreateImage(ImageType::Pointer image);
 
int main(int, char *[])
{
  ImageType::Pointer image = ImageType::New();
  CreateImage(image);
 
  // Create a ShapeLabelMap from the image
  typedef itk::BinaryImageToShapeLabelMapFilter<ImageType> BinaryImageToShapeLabelMapFilterType;
  BinaryImageToShapeLabelMapFilterType::Pointer binaryImageToShapeLabelMapFilter = BinaryImageToShapeLabelMapFilterType::New();
  binaryImageToShapeLabelMapFilter->SetInput(image);
  binaryImageToShapeLabelMapFilter->Update();
 
  // Remove label objects that have PERIMETER less than 50
  typedef itk::ShapeOpeningLabelMapFilter< BinaryImageToShapeLabelMapFilterType::OutputImageType > ShapeOpeningLabelMapFilterType;
  ShapeOpeningLabelMapFilterType::Pointer shapeOpeningLabelMapFilter = ShapeOpeningLabelMapFilterType::New();
  shapeOpeningLabelMapFilter->SetInput( binaryImageToShapeLabelMapFilter->GetOutput() );
  shapeOpeningLabelMapFilter->SetLambda( 50 );
  shapeOpeningLabelMapFilter->ReverseOrderingOn();
  shapeOpeningLabelMapFilter->SetAttribute( ShapeOpeningLabelMapFilterType::LabelObjectType::PERIMETER);
  shapeOpeningLabelMapFilter->Update();
  // Create a label image
  typedef itk::LabelMapToLabelImageFilter<BinaryImageToShapeLabelMapFilterType::OutputImageType, LabelImageType> LabelMapToLabelImageFilterType;
  LabelMapToLabelImageFilterType::Pointer labelMapToLabelImageFilter = LabelMapToLabelImageFilterType::New();
  labelMapToLabelImageFilter->SetInput(shapeOpeningLabelMapFilter->GetOutput());
  labelMapToLabelImageFilter->Update();
 
  typedef itk::RGBPixel<unsigned char>  RGBPixelType;
  typedef itk::Image<RGBPixelType, 2>    RGBImageType;
 
  // Color each label/object a different color
  typedef itk::ScalarToRGBColormapImageFilter<LabelImageType, RGBImageType> RGBFilterType;
  RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
  colormapImageFilter->SetInput(labelMapToLabelImageFilter->GetOutput());
  colormapImageFilter->SetColormap( RGBFilterType::Jet );
  colormapImageFilter->Update();
 
  // Write the output
  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(ImageType::Pointer image)
{
  // Create a black image with three white squares
  ImageType::IndexType start;
  start.Fill(0);
 
  ImageType::SizeType size;
  size.Fill(200);
 
   ImageType::RegionType region;
  region.SetSize(size);
  region.SetIndex(start);
  image->SetRegions(region);
  image->Allocate();
 
  itk::ImageRegionIterator<ImageType> imageIterator(image,image->GetLargestPossibleRegion());
 
  // Make a square
  while(!imageIterator.IsAtEnd())
    {
    if(((imageIterator.GetIndex()[0] > 5 && imageIterator.GetIndex()[0] < 10) &&
      (imageIterator.GetIndex()[1] > 5 && imageIterator.GetIndex()[1] < 10)) ||
      ((imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 60) &&
      (imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 60)) ||
      ((imageIterator.GetIndex()[0] > 100 && imageIterator.GetIndex()[0] < 130) &&
      (imageIterator.GetIndex()[1] > 100 && imageIterator.GetIndex()[1] < 130))  )
        {
        imageIterator.Set(255);
        }
      else
        {
        imageIterator.Set(0);
        }
 
    ++imageIterator;
    }
 
  typedef  itk::ImageFileWriter< ImageType  > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("input.png");
  writer->SetInput(image);
  writer->Update();
 
}
 
</source>
 
{{ITKCMakeLists|{{SUBPAGENAME}}}}

Latest revision as of 19:15, 4 June 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.