Difference between revisions of "ITK/Examples/EdgesAndGradients/GradientMagnitudeImageFilter"

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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.
{{warning|1=The media wiki content on this page is no longer maintained.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.
}}


==GradientMagnitudeImageFilter.cxx==
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
<source lang="cpp">
#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;
}
</source>
 
==CMakeLists.txt==
<source lang="cmake">
cmake_minimum_required(VERSION 2.6)
 
PROJECT(GradientMagnitudeImageFilter)
 
FIND_PACKAGE(ITK REQUIRED)
INCLUDE(${ITK_USE_FILE})
 
ADD_EXECUTABLE(GradientMagnitudeImageFilter GradientMagnitudeImageFilter.cxx)
TARGET_LINK_LIBRARIES(Gradient
vtkHybrid
ITKBasicFilters ITKIO ITKCommon)
</source>

Latest revision as of 16:09, 31 May 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Warning: The media wiki content on this page is no longer maintained.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.

[ITK Sphinx Examples]