Difference between revisions of "ITK/Examples/ImageProcessing/ConnectedComponentImageFilter"

From KitwarePublic
< ITK‎ | Examples
Jump to navigationJump to search
(Template CreateImage, use image internal typedefs, optionally accept input argument.)
Line 3: Line 3:
 
<source lang="cpp">
 
<source lang="cpp">
 
#include "itkImage.h"
 
#include "itkImage.h"
#include "itkImageFileWriter.h"
+
#include "itkImageFileReader.h"
 
#include "itkConnectedComponentImageFilter.h"
 
#include "itkConnectedComponentImageFilter.h"
 
#include "itkRescaleIntensityImageFilter.h"
 
#include "itkRescaleIntensityImageFilter.h"
Line 9: Line 9:
 
#include "QuickView.h"
 
#include "QuickView.h"
 
   
 
   
typedef itk::Image<unsigned char, 2> ImageType;
+
template <typename TImage>
 
+
static void CreateImage(TImage* const image);
static void CreateImage(ImageType::Pointer image);
 
  
 
int main( int argc, char *argv[])
 
int main( int argc, char *argv[])
 
{
 
{
   ImageType::Pointer image = ImageType::New();
+
  typedef itk::Image<unsigned char, 2>  ImageType;
   CreateImage(image);
+
 
 +
   ImageType::Pointer image;
 +
 
 +
  if(argc < 2)
 +
    {
 +
    image = ImageType::New();
 +
    CreateImage(image.GetPointer());
 +
    }
 +
   else
 +
    {
 +
    std::string fileName = argv[1];
 +
    typedef itk::ImageFileReader<ImageType> ReaderType;
 +
    ReaderType::Pointer reader = ReaderType::New();
 +
    reader->SetFileName(fileName);
 +
    reader->Update();
 +
 
 +
    image = reader->GetOutput();
 +
    }
  
 
   typedef itk::ConnectedComponentImageFilter <ImageType, ImageType >
 
   typedef itk::ConnectedComponentImageFilter <ImageType, ImageType >
Line 40: Line 56:
 
}
 
}
  
void CreateImage(ImageType::Pointer image)
+
template <typename TImage>
 +
void CreateImage(TImage* const image)
 
{
 
{
 
   // Create an image with 2 connected components
 
   // Create an image with 2 connected components
   ImageType::RegionType region;
+
   typename TImage::IndexType start = {{0,0}};
  ImageType::IndexType start;
 
 
   start[0] = 0;
 
   start[0] = 0;
 
   start[1] = 0;
 
   start[1] = 0;
  
   ImageType::SizeType size;
+
   typename TImage::SizeType size;
 
   unsigned int NumRows = 200;
 
   unsigned int NumRows = 200;
 
   unsigned int NumCols = 300;
 
   unsigned int NumCols = 300;
Line 54: Line 70:
 
   size[1] = NumCols;
 
   size[1] = NumCols;
  
   region.SetSize(size);
+
   typename TImage::RegionType region(start, size);
  region.SetIndex(start);
 
  
 
   image->SetRegions(region);
 
   image->SetRegions(region);
Line 61: Line 76:
  
 
   // Make a square
 
   // Make a square
   for(unsigned int r = 20; r < 80; r++)
+
   for(typename TImage::IndexValueType r = 20; r < 80; r++)
 
     {
 
     {
     for(unsigned int c = 30; c < 100; c++)
+
     for(typename TImage::IndexValueType c = 30; c < 100; c++)
 
       {
 
       {
       ImageType::IndexType pixelIndex;
+
       typename TImage::IndexType pixelIndex = {{r,c}};
      pixelIndex[0] = r;
 
      pixelIndex[1] = c;
 
  
 
       image->SetPixel(pixelIndex, 255);
 
       image->SetPixel(pixelIndex, 255);
Line 74: Line 87:
  
 
   // Make another square
 
   // Make another square
   for(unsigned int r = 100; r < 130; r++)
+
   for(typename TImage::IndexValueType r = 100; r < 130; r++)
 
     {
 
     {
     for(unsigned int c = 115; c < 160; c++)
+
     for(typename TImage::IndexValueType c = 115; c < 160; c++)
 
       {
 
       {
       ImageType::IndexType pixelIndex;
+
       typename TImage::IndexType pixelIndex = {{r,c}};
      pixelIndex[0] = r;
 
      pixelIndex[1] = c;
 
  
 
       image->SetPixel(pixelIndex, 255);
 
       image->SetPixel(pixelIndex, 255);

Revision as of 08:30, 20 October 2012

ITK Examples Baseline ImageProcessing TestConnectedComponentImageFilter.png

ConnectedComponentImageFilter.cxx

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkConnectedComponentImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"

#include "QuickView.h"
 
template <typename TImage>
static void CreateImage(TImage* const image);

int main( int argc, char *argv[])
{
  typedef itk::Image<unsigned char, 2>  ImageType;

  ImageType::Pointer image;

  if(argc < 2)
    {
    image = ImageType::New();
    CreateImage(image.GetPointer());
    }
  else
    {
    std::string fileName = argv[1];
    typedef itk::ImageFileReader<ImageType> ReaderType;
    ReaderType::Pointer reader = ReaderType::New();
    reader->SetFileName(fileName);
    reader->Update();

    image = reader->GetOutput();
    }

  typedef itk::ConnectedComponentImageFilter <ImageType, ImageType >
    ConnectedComponentImageFilterType;

  ConnectedComponentImageFilterType::Pointer labelFilter
    = ConnectedComponentImageFilterType::New ();
  labelFilter->SetInput(image);
  labelFilter->Update();

  typedef itk::RescaleIntensityImageFilter< ImageType, ImageType > RescaleFilterType;
  RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
  rescaleFilter->SetOutputMinimum(0);
  rescaleFilter->SetOutputMaximum(255);
  rescaleFilter->SetInput(labelFilter->GetOutput());

  QuickView viewer;
  viewer.AddImage<ImageType>( image, false );  
  viewer.AddImage<ImageType>( rescaleFilter->GetOutput(), false );  
  viewer.Visualize();

  return EXIT_SUCCESS;
}

template <typename TImage>
void CreateImage(TImage* const image)
{
  // Create an image with 2 connected components
  typename TImage::IndexType start = {{0,0}};
  start[0] = 0;
  start[1] = 0;

  typename TImage::SizeType size;
  unsigned int NumRows = 200;
  unsigned int NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;

  typename TImage::RegionType region(start, size);

  image->SetRegions(region);
  image->Allocate();

  // Make a square
  for(typename TImage::IndexValueType r = 20; r < 80; r++)
    {
    for(typename TImage::IndexValueType c = 30; c < 100; c++)
      {
      typename TImage::IndexType pixelIndex = {{r,c}};

      image->SetPixel(pixelIndex, 255);
      }
    }

  // Make another square
  for(typename TImage::IndexValueType r = 100; r < 130; r++)
    {
    for(typename TImage::IndexValueType c = 115; c < 160; c++)
      {
      typename TImage::IndexType pixelIndex = {{r,c}};

      image->SetPixel(pixelIndex, 255);
      }
    }
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.9.5)
 
project(ConnectedComponentImageFilter)
 
find_package(ITK REQUIRED)
include(${ITK_USE_FILE})
if (ITKVtkGlue_LOADED)
  find_package(VTK REQUIRED)
  include(${VTK_USE_FILE})
else()
  find_package(ItkVtkGlue REQUIRED)
  include(${ItkVtkGlue_USE_FILE})
  set(Glue ItkVtkGlue)
endif()
 
add_executable(ConnectedComponentImageFilter MACOSX_BUNDLE ConnectedComponentImageFilter.cxx)
target_link_libraries(ConnectedComponentImageFilter
  ${Glue}  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

Download and Build ConnectedComponentImageFilter

Click here to download ConnectedComponentImageFilter. and its CMakeLists.txt file. Once the tarball ConnectedComponentImageFilter.tar has been downloaded and extracted,

cd ConnectedComponentImageFilter/build 
  • If ITK is installed:
cmake ..
  • If ITK is not installed but compiled on your system, you will need to specify the path to your ITK build:
cmake -DITK_DIR:PATH=/home/me/itk_build ..

Build the project,

make

and run it:

./ConnectedComponentImageFilter

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK and ITK bin directories to your path. This will resolve the VTK and ITK dll's at run time.

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

ITK >= 4

For examples that use QuickView (which depends on VTK), you must have built ITK with Module_ITKVtkGlue=ON.

ITK < 4

Some of the ITK Examples require VTK to display the images. If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.