ITK/Examples/WishList/Registration/BlockMatchingImageFilter

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This currently segfaults on the line blockMatchingImageFilter->UpdateLargestPossibleRegion();

BlockMatchingImageFilter.cxx

#include "itkBlockMatchingImageFilter.h"
#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkPoint.h"
#include "itkPointSet.h"

typedef itk::Image<unsigned char, 2> ImageType;

static void CreateImage(ImageType::Pointer image, const unsigned int x);

int main(int argc, char *argv[])
{
  // Create input images
  ImageType::Pointer fixedImage = ImageType::New();
  CreateImage(fixedImage, 40);

  ImageType::Pointer movingImage = ImageType::New();
  CreateImage(movingImage, 50);

//  typedef  itk::ImageFileWriter<ImageType> WriterType;
//  WriterType::Pointer writer = WriterType::New();
//  writer->SetFileName("input.png");
//  writer->SetInput(input);
//  writer->Update();

  //  typedef itk::BlockMatchingImageFilter<ImageType, ImageType, PointSetType> BlockMatchingImageFilterType;
  typedef itk::BlockMatchingImageFilter<ImageType> BlockMatchingImageFilterType;
  BlockMatchingImageFilterType::Pointer blockMatchingImageFilter =
        BlockMatchingImageFilterType::New();

  // Generate feature points
//  typedef itk::PointSet< float, 2>   PointSetType;
  typedef BlockMatchingImageFilterType::FeaturePointsType   PointSetType;
  typedef PointSetType::PointType PointType;
  typedef PointSetType::PointsContainerPointer PointsContainerPointer;

  PointSetType::Pointer   pointSet = PointSetType::New();
  PointsContainerPointer  points = pointSet->GetPoints();

  PointType p0, p1, p2, p3;

  p0[0]=  40.0; p0[1]= 40.0;
  p1[0]=  40.0; p1[1]= 60.0;
  p2[0]=  60.0; p2[1]= 40.0;
  p3[0]=  60.0; p2[1]= 60.0;

  points->InsertElement(0, p0);
  points->InsertElement(1, p1);
  points->InsertElement(2, p2);
  points->InsertElement(3, p3);

  blockMatchingImageFilter->SetFixedImage(fixedImage);
  blockMatchingImageFilter->SetMovingImage(movingImage);
  blockMatchingImageFilter->SetFeaturePoints(pointSet);
  blockMatchingImageFilter->UpdateLargestPossibleRegion();

  typename BlockMatchingImageFilterType::DisplacementsType * displacements =
          blockMatchingImageFilter->GetDisplacements();

  std::cout << "There are " << displacements->GetNumberOfPoints() << " displacements." << std::endl;

  return EXIT_SUCCESS;
}

void CreateImage(ImageType::Pointer image, const unsigned int x)
{
  // Allocate empty image
  itk::Index<2> start; start.Fill(0);
  itk::Size<2> size; size.Fill(100);
  ImageType::RegionType region(start, size);
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);

  // Make a white square
  for(unsigned int r = x; r < x+20; r++)
    {
    for(unsigned int c = 40; c < 60; c++)
      {
      ImageType::IndexType pixelIndex;
      pixelIndex[0] = r;
      pixelIndex[1] = c;
      image->SetPixel(pixelIndex, 255);
      }
    }
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.9.5)

project(BlockMatchingImageFilter)

find_package(ITK REQUIRED)
include(${ITK_USE_FILE})
if (ITKVtkGlue_LOADED)
  find_package(VTK REQUIRED)
  include(${VTK_USE_FILE})
endif()

add_executable(BlockMatchingImageFilter MACOSX_BUNDLE BlockMatchingImageFilter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(BlockMatchingImageFilter ITKReview ${ITK_LIBRARIES})
else( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(BlockMatchingImageFilter ${ITK_LIBRARIES})
endif( "${ITK_VERSION_MAJOR}" LESS 4 )

Download and Build BlockMatchingImageFilter

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

cd BlockMatchingImageFilter/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:

./BlockMatchingImageFilter

WINDOWS USERS PLEASE NOTE: Be sure to add the ITK bin directory to your path. This will resolve the 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.