ITK/Examples/Images/ConvertPixelBuffer: Difference between revisions

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==ConvertPixelBuffer.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 "itkConvertPixelBuffer.h"
#include "itkDefaultConvertPixelTraits.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
 
typedef itk::Image<unsigned char, 2> ScalarImageType;
typedef itk::Image<itk::Vector<unsigned char, 3>, 2>  ColorImageType;
 
static void CreateImage(ColorImageType::Pointer image);
 
int main(int, char *[])
{
  ColorImageType::Pointer image = ColorImageType::New();
  CreateImage(image);
 
  typedef itk::ConvertPixelBuffer<ColorImageType, ScalarImageType, itk::DefaultConvertPixelTraits< ScalarImageType::PixelType > >
          ConvertFilterType;
 
  ScalarImageType::Pointer scalarImage = ScalarImageType::New();
  ConvertFilterType::ConvertRGBToGray(image->GetBufferPointer(), scalarImage->GetBufferPointer(),
                                      scalarImage->GetLargestPossibleRegion().GetSize()[0]*scalarImage->GetLargestPossibleRegion().GetSize()[1]);
 
  // Visualize first image
  typedef itk::ImageToVTKImageFilter<ColorImageType> ColorConnectorType;
  ColorConnectorType::Pointer connector = ColorConnectorType::New();
  connector->SetInput(image);
 
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
  actor->SetInput(connector->GetOutput());
 
  // Visualize flipped image
  typedef itk::ImageToVTKImageFilter<ScalarImageType> ScalarConnectorType;
  ScalarConnectorType::Pointer grayscaleConnector = ScalarConnectorType::New();
  grayscaleConnector->SetInput(scalarImage);
 
  vtkSmartPointer<vtkImageActor> grayscaleActor =
    vtkSmartPointer<vtkImageActor>::New();
  grayscaleActor->SetInput(grayscaleConnector->GetOutput());
 
  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
 
  // Setup both renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
   renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);
 
  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.4, .5, .6);
 
  // Add the sphere to the left and the cube to the right
  leftRenderer->AddActor(actor);
  rightRenderer->AddActor(grayscaleActor);
 
  leftRenderer->ResetCamera();
  rightRenderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}
 
void CreateImage(ColorImageType::Pointer image)
{
  // Create an image with 2 connected components
  ColorImageType::RegionType region;
  ColorImageType::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  ColorImageType::SizeType size;
  unsigned int NumRows = 200;
  unsigned int NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;
 
  region.SetSize(size);
  region.SetIndex(start);
 
  image->SetRegions(region);
  image->Allocate();
 
  // Make a square
  for(unsigned int r = 20; r < 80; r++)
  {
      for(unsigned int c = 20; c < 80; c++)
      {
          ColorImageType::IndexType pixelIndex;
          pixelIndex[0] = r;
          pixelIndex[1] = c;
          ColorImageType::PixelType pixel;
          pixel[0] = 150;
          pixel[1] = 0;
          pixel[2] = 0;
          image->SetPixel(pixelIndex, pixel);
      }
  }
}
 
</source>
 
{{ITKVTKCMakeLists|ConvertPixelBuffer|}}

Latest revision as of 15:38, 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.