|
|
| Line 1: |
Line 1: |
| <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| | {{warning|1=The media wiki content on this page is no longer maintained.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.
| |
| | |
| ==Classes Demonstrated==
| |
| {{ITKDoxygenURL|CropImageFilter}} | |
| | |
| ==Output==
| |
| The original image is displayed on the left. The cropped image is displayed on the right. | |
| | |
| ==CropImageFilter.cxx==
| |
| <source lang="cpp">
| |
| #include "itkImage.h"
| |
| #include "itkImageFileWriter.h"
| |
| #include "itkImageFileReader.h"
| |
| #include "itkCropImageFilter.h"
| |
| | |
| #include "itksys/SystemTools.hxx"
| |
| | |
| #include "QuickView.h"
| |
| | |
| typedef itk::RGBPixel<unsigned char> PixelType;
| |
| typedef itk::Image<PixelType, 2> ImageType;
| |
| | |
| static void CreateImage(ImageType::Pointer image);
| |
| | |
| int main(int argc, char *argv[])
| |
| {
| |
| ImageType::Pointer image = ImageType::New();
| |
| ImageType::SizeType cropSize;
| |
| std::stringstream desc;
| |
| | |
| if (argc > 1)
| |
| {
| |
| typedef itk::ImageFileReader<ImageType> ReaderType;
| |
| ReaderType::Pointer reader = ReaderType::New();
| |
| reader->SetFileName( argv[1] );
| |
| if (argc > 2)
| |
| {
| |
| cropSize[0] = atoi(argv[2]);
| |
| cropSize[1] = atoi(argv[3]);
| |
| }
| |
| reader->Update();
| |
| image = reader->GetOutput();
| |
| desc << itksys::SystemTools::GetFilenameName(argv[1]);
| |
| }
| |
| else
| |
| {
| |
| CreateImage(image);
| |
| cropSize[0] = 10;
| |
| cropSize[1] = 14;
| |
| desc << "Synthetic image";
| |
| }
| |
| | |
| typedef itk::CropImageFilter <ImageType, ImageType>
| |
| CropImageFilterType;
| |
| | |
| CropImageFilterType::Pointer cropFilter
| |
| = CropImageFilterType::New();
| |
| cropFilter->SetInput(image);
| |
| // The SetBoundaryCropSize( cropSize ) method specifies the size of
| |
| // the boundary to be cropped at both the uppper & lower ends of the
| |
| // image eg. cropSize/2 pixels will be removed at both upper & lower
| |
| // extents
| |
| | |
| cropFilter->SetBoundaryCropSize(cropSize);
| |
| | |
| // The below three lines are equivalent to the above two lines:
| |
| //ImageType::SizeType halfCropSize = {5,7};
| |
| //cropFilter->SetUpperBoundaryCropSize(halfCropSize);
| |
| //cropFilter->SetLowerBoundaryCropSize(halfCropSize);
| |
| | |
| QuickView viewer;
| |
| viewer.AddRGBImage(
| |
| image.GetPointer(),
| |
| true,
| |
| desc.str());
| |
| | |
| std::stringstream desc2;
| |
| desc2 << "CropImageFilter, crop size = {"
| |
| << cropSize[0] << ", " << cropSize[1] << "}";
| |
| viewer.AddRGBImage(
| |
| cropFilter->GetOutput(),
| |
| true,
| |
| desc2.str());
| |
| | |
| viewer.Visualize();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void CreateImage(ImageType::Pointer image)
| |
| {
| |
| // Create an image with 2 connected components | |
| ImageType::RegionType region;
| |
| ImageType::IndexType start;
| |
| start[0] = 0;
| |
| start[1] = 0;
| |
| | |
| ImageType::SizeType size;
| |
| unsigned int NumRows = 200;
| |
| unsigned int NumCols = 300;
| |
| size[0] = NumRows;
| |
| size[1] = NumCols;
| |
| | |
| region.SetSize(size);
| |
| region.SetIndex(start);
| |
| | |
| image->SetRegions(region);
| |
| image->Allocate();
| |
| image->FillBuffer( itk::NumericTraits<ImageType::PixelType>::Zero);
| |
| | |
| // 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
| |
| for(unsigned int r = 20; r < 180; r++)
| |
| {
| |
| for(unsigned int c = 30; c < 270; c++)
| |
| {
| |
| ImageType::IndexType pixelIndex;
| |
| pixelIndex[0] = r;
| |
| pixelIndex[1] = c;
| |
|
| |
| image->SetPixel(pixelIndex, 200);
| |
| }
| |
| }
| |
| }
| |
| </source>
| |
| | |
| {{ITKCMakeLists|{{SUBPAGENAME}}}}
| |
