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| <div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestCropImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| ==Description==
| | }} |
| This example demonstrates how to crop an image. The SetBoundaryCropSize( cropSize ) method specifies the size of the boundary to be cropped at both the uppper & lower ends of the image - e.g. cropSize/2 pixels will be removed at both upper & lower extents.
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| ==Classes Demonstrated==
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| {{ITKDoxygenURL|CropImageFilter}} | |
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| ==Output==
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| The original image is displayed on the left. The cropped image is displayed on the right. | |
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| ==CropImageFilter.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 "itkImageFileReader.h"
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| #include "itkCropImageFilter.h"
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| #include "itksys/SystemTools.hxx"
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| #include "QuickView.h"
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| typedef itk::RGBPixel<unsigned char> PixelType;
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| typedef itk::Image<PixelType, 2> ImageType;
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| static void CreateImage(ImageType::Pointer image);
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| int main(int argc, char *argv[])
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| {
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| ImageType::Pointer image = ImageType::New();
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| ImageType::SizeType cropSize;
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| std::stringstream desc;
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| if (argc > 1)
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| {
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| 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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| if (argc > 2)
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| {
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| cropSize[0] = atoi(argv[2]);
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| cropSize[1] = atoi(argv[3]);
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| }
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| reader->Update();
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| image = reader->GetOutput();
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| desc << itksys::SystemTools::GetFilenameName(argv[1]);
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| }
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| else
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| {
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| CreateImage(image);
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| cropSize[0] = 10;
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| cropSize[1] = 14;
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| desc << "Synthetic image";
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| }
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| typedef itk::CropImageFilter <ImageType, ImageType>
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| CropImageFilterType;
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| CropImageFilterType::Pointer cropFilter
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| = CropImageFilterType::New();
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| cropFilter->SetInput(image);
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| // The SetBoundaryCropSize( cropSize ) method specifies the size of
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| // the boundary to be cropped at both the uppper & lower ends of the
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| // image eg. cropSize/2 pixels will be removed at both upper & lower
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| // extents
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| cropFilter->SetBoundaryCropSize(cropSize);
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| // The below three lines are equivalent to the above two lines:
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| //ImageType::SizeType halfCropSize = {5,7};
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| //cropFilter->SetUpperBoundaryCropSize(halfCropSize);
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| //cropFilter->SetLowerBoundaryCropSize(halfCropSize);
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| QuickView viewer;
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| viewer.AddRGBImage(
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| image.GetPointer(),
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| true,
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| desc.str());
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| std::stringstream desc2;
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| desc2 << "CropImageFilter, crop size = {"
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| << cropSize[0] << ", " << cropSize[1] << "}";
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| viewer.AddRGBImage(
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| cropFilter->GetOutput(),
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| true,
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| desc2.str());
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| viewer.Visualize();
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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::RegionType region;
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| ImageType::IndexType start;
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| start[0] = 0;
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| start[1] = 0;
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| ImageType::SizeType size;
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| unsigned int NumRows = 200;
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| unsigned int NumCols = 300;
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| size[0] = NumRows;
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| size[1] = NumCols;
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| region.SetSize(size);
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| region.SetIndex(start);
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| image->SetRegions(region);
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| image->Allocate();
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| image->FillBuffer( itk::NumericTraits<ImageType::PixelType>::Zero);
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| // Make a rectangle, centered at (100,150) with sides 160 & 240 | |
| // This provides a 20 x 30 border around the square for the crop filter to remove
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| for(unsigned int r = 20; r < 180; r++)
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| {
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| for(unsigned int c = 30; c < 270; 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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|
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| image->SetPixel(pixelIndex, 200);
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| }
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| }
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| }
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| </source>
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| {{ITKVTKCMakeLists|CropImageFilter|}}
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