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| <div class="floatright">[[File:ITK_Examples_Baseline_EdgesAndGradients_TestGradientMagnitudeImageFilter.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| 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.
| | }} |
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| ==GradientMagnitudeImageFilter.cxx==
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkImageFileWriter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkGradientMagnitudeImageFilter.h"
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| #include "QuickView.h"
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| int main(int argc, char * argv[])
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| {
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| // Verify command line arguments
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| if( argc < 2 )
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| {
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| std::cerr << "Usage: " << std::endl;
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| std::cerr << argv[0] << " inputImageFile" << std::endl;
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| return EXIT_FAILURE;
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| }
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| // Parse command line arguments
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| std::string inputFilename = argv[1];
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| // Setup types
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| typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;
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| typedef itk::Image< float, 2 > FloatImageType;
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| typedef itk::ImageFileReader< UnsignedCharImageType > readerType;
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| typedef itk::GradientMagnitudeImageFilter<
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| UnsignedCharImageType, FloatImageType > filterType;
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| // Create and setup a reader
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| readerType::Pointer reader = readerType::New();
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| reader->SetFileName( inputFilename.c_str() );
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| // Create and setup a gradient filter
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| filterType::Pointer gradientFilter = filterType::New();
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| gradientFilter->SetInput( reader->GetOutput() );
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| gradientFilter->Update();
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| QuickView viewer;
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| viewer.AddImage<UnsignedCharImageType>(reader->GetOutput());
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| viewer.AddImage<FloatImageType>(gradientFilter->GetOutput());
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| viewer.Visualize();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(GradientMagnitudeImageFilter)
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(GradientMagnitudeImageFilter GradientMagnitudeImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(Gradient
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| vtkHybrid
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| ITKBasicFilters ITKIO ITKCommon)
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| </source>
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