ITK/Examples/EdgesAndGradients/GradientMagnitudeImageFilter

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ITK Examples Baseline EdgesAndGradients TestGradientMagnitudeImageFilter.png

This example demonstrates how to compute the magnitude of the gradient of an image. The original image and an image of the gradient magnitude are displayed.

Contents

GradientMagnitudeImageFilter.cxx

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkGradientMagnitudeImageFilter.h"
 
#include "QuickView.h"
 
int main(int argc, char * argv[])
{
  // Verify command line arguments
  if( argc < 2 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " inputImageFile" << std::endl;
    return EXIT_FAILURE;
    }
 
  // Parse command line arguments
  std::string inputFilename = argv[1];
 
  // Setup types
  typedef itk::Image< unsigned char,  2 >  UnsignedCharImageType;
  typedef itk::Image< float,  2 >   FloatImageType;
  typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
 
  typedef itk::GradientMagnitudeImageFilter<
		  UnsignedCharImageType, FloatImageType >  filterType;
 
  // Create and setup a reader
  readerType::Pointer reader = readerType::New();
  reader->SetFileName( inputFilename.c_str() );
 
  // Create and setup a gradient filter
  filterType::Pointer gradientFilter = filterType::New();
  gradientFilter->SetInput( reader->GetOutput() );
  gradientFilter->Update();
 
  QuickView viewer;
  viewer.AddImage<UnsignedCharImageType>(reader->GetOutput());
  viewer.AddImage<FloatImageType>(gradientFilter->GetOutput());
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
project(GradientMagnitudeFilter)
 
find_package(ItkVtkGlue REQUIRED)
include(${ItkVtkGlue_USE_FILE})
 
add_executable(GradientMagnitudeFilter GradientMagnitudeFilter.cxx)
target_link_libraries(GradientMagnitudeFilter
  ItkVtkGlue  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

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

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.

Retrieved from "http://www.itk.org/Wiki/ITK/Examples/EdgesAndGradients/GradientMagnitudeImageFilter"
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