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| This example demonstrates the creation of a filter which produces the output image which is equal to the input image except its pixel on the main diagonal are turned to white.
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
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| ==ImageFilterExample.cxx==
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| <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 "ImageFilter.h"
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| int main(int, char*[])
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| {
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| // Setup types
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| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::ImageFilter<ImageType> FilterType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName("Test.jpg");
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| reader->Update();
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|
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| // Create and the filter
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| FilterType::Pointer filter = FilterType::New();
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| filter->SetInput(reader->GetOutput());
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| filter->Update();
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetFileName("TestOutput.jpg");
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| writer->SetInput(filter->GetOutput());
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| writer->Update();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| ==ImageFilter.h==
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| <source lang="cpp">
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| #ifndef __itkImageFilter_h
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| #define __itkImageFilter_h
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| #include "itkImageToImageFilter.h"
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| namespace itk
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| {
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| template< class TImage>
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| class ImageFilter:public ImageToImageFilter< TImage, TImage >
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| {
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| public:
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| /** Standard class typedefs. */
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| typedef ImageFilter Self;
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| typedef ImageToImageFilter< TImage, TImage > Superclass; | |
| typedef SmartPointer< Self > Pointer;
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| /** Method for creation through the object factory. */
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| itkNewMacro(Self);
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| /** Run-time type information (and related methods). */
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| itkTypeMacro(ImageFilter, ImageToImageFilter);
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| protected:
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| ImageFilter(){}
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| ~ImageFilter(){}
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| /** Does the real work. */
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| virtual void GenerateData();
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| private:
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| ImageFilter(const Self &); //purposely not implemented
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| void operator=(const Self &); //purposely not implemented
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| };
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| } //namespace ITK
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| #ifndef ITK_MANUAL_INSTANTIATION
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| #include "ImageFilter.txx"
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| #endif
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| #endif // __itkImageFilter_h
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| </source>
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| | |
| ==ImageFilter.txx==
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| <source lang="cpp">
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| #ifndef __itkImageFilter_txx
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| #define __itkImageFilter_txx
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| #include "ImageFilter.h"
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| #include "itkObjectFactory.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkImageRegionConstIterator.h"
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| namespace itk
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| {
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| template< class TImage>
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| void ImageFilter< TImage>
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| ::GenerateData()
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| {
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| typename TImage::ConstPointer input = this->GetInput();
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|
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| typename TImage::Pointer output = this->GetOutput();
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| output->SetRegions(input->GetLargestPossibleRegion());
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| output->Allocate();
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|
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| itk::ImageRegionIterator<TImage> outputIterator(output, output->GetLargestPossibleRegion());
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| itk::ImageRegionConstIterator<TImage> inputIterator(input, input->GetLargestPossibleRegion());
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| while(!outputIterator.IsAtEnd())
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| {
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| if(inputIterator.GetIndex()[0] == inputIterator.GetIndex()[1])
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| {
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| outputIterator.Set(255);
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| }
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| else
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| {
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| outputIterator.Set(inputIterator.Get());
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| }
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| ++inputIterator;
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| ++outputIterator;
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| }
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| }
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| }// end namespace | |
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| #endif
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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(ImageFilter)
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(ImageFilter ImageFilterExample.cxx)
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| TARGET_LINK_LIBRARIES(ImageFilter ITKBasicFilters ITKIO ITKCommon)
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| </source>
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