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| ==ShapedNeighborhoodIterator.cxx== | | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| <source lang="cpp">
| | }} |
| #include "itkImage.h"
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| #include "itkShapedNeighborhoodIterator.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkNeighborhoodAlgorithm.h"
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|
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| // Notice that char type pixel values will not appear
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| // properly on the command prompt therefore for the
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| // demonstration purposes it is best to use the int
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| // type, however in real applications iterators have
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| // no problems with char type images.
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| //typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::Image<unsigned int, 2> ImageType;
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| | |
| 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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| ImageType::SizeType radius;
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| radius[0] = 1;
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| radius[1] = 1;
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| | |
| typedef itk::ShapedNeighborhoodIterator<ImageType> IteratorType;
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| IteratorType::OffsetType top = {{0,-1}};
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| IteratorType::OffsetType bottom = {{0,1}};
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| IteratorType::OffsetType left = {{-1,0}};
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| IteratorType::OffsetType right = {{1,0}};
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| IteratorType::OffsetType center = {{0,0}};
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|
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| | |
| typedef itk::NeighborhoodAlgorithm
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| ::ImageBoundaryFacesCalculator< ImageType > FaceCalculatorType;
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| | |
| FaceCalculatorType faceCalculator;
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| FaceCalculatorType::FaceListType faceList;
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| faceList = faceCalculator(image, image->GetLargestPossibleRegion(),
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| radius);
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| FaceCalculatorType::FaceListType::iterator faceListIterator;
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| | |
| for ( faceListIterator=faceList.begin(); faceListIterator != faceList.end(); ++faceListIterator)
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| {
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| IteratorType iterator(radius, image, *faceListIterator);
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| iterator.ActivateOffset(top);
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| iterator.ActivateOffset(bottom);
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| iterator.ActivateOffset(left);
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| iterator.ActivateOffset(right);
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| iterator.ActivateOffset(center);
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| | |
| for(iterator.GoToBegin(); !iterator.IsAtEnd(); ++iterator) // Crashes here!
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| {
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| // The method for accessing pixel values using neighborhood
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| // iterators is GetPixel(offset).
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| std::cout << "top: " << iterator.GetPixel(top) << std::endl;
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| std::cout << "bottom: " << iterator.GetPixel(bottom) << std::endl;
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| std::cout << "left: " << iterator.GetPixel(left) << std::endl;
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| std::cout << "right: " << iterator.GetPixel(right) << std::endl;
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| /*
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| std::cout << "top: " << iterator[top] << std::endl;
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| std::cout << "bottom: " << iterator[bottom] << std::endl;
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| std::cout << "left: " << iterator[left] << std::endl;
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| std::cout << "right: " << iterator[right] << std::endl;
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| */
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| }
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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::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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| size[0] = 100;
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| size[1] = 200;
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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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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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| while(!imageIterator.IsAtEnd())
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| {
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| imageIterator.Set(0);
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| ++imageIterator;
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| }
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| }
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| </source>
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| {{ITKCMakeLists|ShapedNeighborhoodIterator}}
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