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| Note: The shrink factors must be greater than zero. That is, you cannot use this filter to enlarge an image.
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | | }} |
| ==ShrinkImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileWriter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkShrinkImageFilter.h"
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| | |
| typedef itk::Image<unsigned char, 2> ImageType;
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| | |
| static void CreateImage(ImageType::Pointer image);
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| | |
| int main(int, char *[])
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| {
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| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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| | |
| std::cout << "Original size: " << image->GetLargestPossibleRegion().GetSize() << std::endl;
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| | |
| typedef itk::ShrinkImageFilter <ImageType, ImageType>
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| ShrinkImageFilterType;
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| | |
| ShrinkImageFilterType::Pointer shrinkFilter
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| = ShrinkImageFilterType::New();
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| shrinkFilter->SetInput(image);
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| shrinkFilter->SetShrinkFactor(0, 2); // shrink the first dimension by a factor of 2 (i.e. 100 gets changed to 50)
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| shrinkFilter->SetShrinkFactor(1, 3); // shrink the second dimension by a factor of 3 (i.e. 100 gets changed to 33) | |
| shrinkFilter->Update();
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| | |
| std::cout << "New size: " << shrinkFilter->GetOutput()->GetLargestPossibleRegion().GetSize() << std::endl;
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| | |
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| return EXIT_SUCCESS;
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| }
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| | |
| void CreateImage(ImageType::Pointer image)
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| {
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| // Create an image with 2 connected components
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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(100);
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| | |
| ImageType::RegionType region(start, size);
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| image->SetRegions(region);
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| image->Allocate();
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| image->FillBuffer(0);
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| | |
| // Make a white square
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| for(unsigned int r = 20; r < 80; r++)
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| {
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| for(unsigned int c = 20; c < 30; 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, 255);
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| }
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| }
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| }
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| </source>
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| {{ITKCMakeLists|ShrinkImageFilter|}}
| |
