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| <div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestRGBResampleImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| ==RGBResampleImageFilter.cxx==
| | }} |
| <source lang="cpp">
| |
| | |
| #include "itkImage.h"
| |
| #include "itkIdentityTransform.h"
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| #include "itkImageFileReader.h"
| |
| #include "itkVectorResampleImageFilter.h"
| |
| #include "itkVectorNearestNeighborInterpolateImageFunction.h"
| |
| #include "itkRGBPixel.h"
| |
| | |
| #include "QuickView.h"
| |
| | |
| typedef itk::Image<itk::RGBPixel<unsigned char>, 2> ImageType;
| |
| | |
| static void CreateImage(ImageType::Pointer image);
| |
| | |
| int main(int argc, char *argv[])
| |
| { | |
| double factor = 2.0;
| |
| | |
| // Create input image
| |
| ImageType::Pointer input;
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| if(argc < 2)
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| {
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| input = ImageType::New();
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| CreateImage(input);
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| }
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| else
| |
| {
| |
| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| reader->Update();
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| input = reader->GetOutput();
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| if (argc > 2)
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| {
| |
| factor = atof(argv[2]);
| |
| }
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| }
| |
| | |
| ImageType::SizeType inputSize = input->GetLargestPossibleRegion().GetSize();
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| | |
| std::cout << "Input size: " << inputSize << std::endl;
| |
| | |
| // Resize
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| ImageType::SizeType outputSize;
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| outputSize[0] = inputSize[0] * factor;
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| outputSize[1] = inputSize[1] * factor;
| |
| | |
| ImageType::SpacingType outputSpacing;
| |
| outputSpacing[0] = input->GetSpacing()[0] * (static_cast<double>(inputSize[0]) / static_cast<double>(outputSize[0]));
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| outputSpacing[1] = input->GetSpacing()[1] * (static_cast<double>(inputSize[1]) / static_cast<double>(outputSize[1]));
| |
|
| |
| typedef itk::IdentityTransform<double, 2> TransformType;
| |
| typedef itk::VectorResampleImageFilter<ImageType, ImageType> ResampleImageFilterType;
| |
| ResampleImageFilterType::Pointer resample = ResampleImageFilterType::New();
| |
| resample->SetInput(input);
| |
| resample->SetSize(outputSize);
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| resample->SetOutputSpacing(outputSpacing);
| |
| resample->SetTransform(TransformType::New());
| |
| resample->UpdateLargestPossibleRegion();
| |
|
| |
| typedef itk::VectorNearestNeighborInterpolateImageFunction<
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| ImageType, double > NearestInterpolatorType;
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| NearestInterpolatorType::Pointer nnInterpolator =
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| NearestInterpolatorType::New();
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| | |
| ResampleImageFilterType::Pointer resampleNN =
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| ResampleImageFilterType::New();
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| resampleNN->SetInput(input);
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| resampleNN->SetSize(outputSize);
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| resampleNN->SetOutputSpacing(outputSpacing);
| |
| resampleNN->SetTransform(TransformType::New());
| |
| resampleNN->SetInterpolator(nnInterpolator);
| |
| resampleNN->UpdateLargestPossibleRegion();
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|
| |
| ImageType::Pointer output = resample->GetOutput();
| |
|
| |
| std::cout << "Output size: " << output->GetLargestPossibleRegion().GetSize() << std::endl;
| |
| | |
| QuickView viewer;
| |
| | |
| viewer.AddRGBImage(input.GetPointer(),
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| true,
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| "Original");
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| viewer.AddRGBImage(output.GetPointer(),
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| true,
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| "Resampled");
| |
| | |
| viewer.AddRGBImage(resampleNN->GetOutput(),
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| true,
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| "Resampled NN");
| |
| | |
| viewer.Visualize();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void CreateImage(ImageType::Pointer image)
| |
| {
| |
| // Create a black image with 2 white regions
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|
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| ImageType::IndexType start;
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| start.Fill(0);
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| | |
| ImageType::SizeType size;
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| size.Fill(200);
| |
| | |
| ImageType::RegionType region(start,size); | |
| image->SetRegions(region);
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| image->Allocate();
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| image->FillBuffer( itk::NumericTraits< ImageType::PixelType >::Zero);
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|
| |
| ImageType::PixelType pixel;
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| pixel.SetRed(200);
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| pixel.SetGreen(50);
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| pixel.SetBlue(50);
| |
| | |
| // Make a square
| |
| for(unsigned int r = 20; r < 80; r++)
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| {
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| for(unsigned int c = 30; c < 100; c++)
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| {
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| ImageType::IndexType pixelIndex;
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| pixelIndex[0] = r;
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| pixelIndex[1] = c;
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| | |
| image->SetPixel(pixelIndex, pixel);
| |
| | |
| }
| |
| }
| |
| | |
| }
| |
| </source>
| |
| | |
| {{ITKCMakeLists|RGBResampleImageFilter}}
| |
