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| ==ManuallyRemovingLabels.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| | {{warning|1=The media wiki content on this page is no longer maintained.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 "itkImageFileWriter.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkBinaryImageToLabelMapFilter.h"
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|
| |
| typedef itk::Image<unsigned char, 2> ImageType;
| |
| static void CreateImage(ImageType::Pointer image);
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|
| |
| int main(int, char *[])
| |
| { | |
| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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|
| |
| typedef itk::BinaryImageToLabelMapFilter<ImageType> BinaryImageToLabelMapFilterType;
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| BinaryImageToLabelMapFilterType::Pointer binaryImageToLabelMapFilter = BinaryImageToLabelMapFilterType::New();
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| binaryImageToLabelMapFilter->SetInput(image);
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| binaryImageToLabelMapFilter->Update();
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|
| |
| // The output of this filter is an itk::LabelMap, which contains itk::LabelObject's
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| std::cout << "There are " << binaryImageToLabelMapFilter->GetOutput()->GetNumberOfLabelObjects() << " objects." << std::endl;
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| | |
| std::vector<unsigned long> labelsToRemove;
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|
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| std::cout << "There are originally " << binaryImageToLabelMapFilter->GetOutput()->GetNumberOfLabelObjects() << " objects." << std::endl;
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|
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| // Note: do NOT remove the labels inside the loop! The IDs are stored such that they will change when one is deleted.
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| // Instead, mark all of the labels to be removed first and then remove them all together.
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| for(unsigned int i = 0; i < binaryImageToLabelMapFilter->GetOutput()->GetNumberOfLabelObjects(); i++)
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| {
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| // Get the ith region
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| BinaryImageToLabelMapFilterType::OutputImageType::LabelObjectType* labelObject = binaryImageToLabelMapFilter->GetOutput()->GetNthLabelObject(i);
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| //std::cout << "Region " << i << " has " << labelObject->Size() << " pixels." << std::endl;
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|
| |
| // Mark every other label to be removed
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| if(i%2 == 0)
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| {
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| labelsToRemove.push_back(labelObject->GetLabel());
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| }
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| }
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|
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| std::cout << "Removing " << labelsToRemove.size() << " objects." << std::endl;
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| // Remove all regions that were marked for removal.
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| for(unsigned int i = 0; i < labelsToRemove.size(); ++i)
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| {
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| binaryImageToLabelMapFilter->GetOutput()->RemoveLabel(labelsToRemove[i]);
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| }
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| | |
| std::cout << "There are " << binaryImageToLabelMapFilter->GetOutput()->GetNumberOfLabelObjects()
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| << " objects remaining." << std::endl;
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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 a black image with a white square
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| ImageType::IndexType start;
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| start.Fill(0);
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|
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| ImageType::SizeType size;
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| size.Fill(20);
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|
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| ImageType::RegionType region(start,size); | |
| image->SetRegions(region);
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| image->Allocate();
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| image->FillBuffer(0);
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| | |
| // Make line of non-touching diagonal pixels
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| for(unsigned int i = 0; i < 20; i+=2)
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| {
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| itk::Index<2> pixel;
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| pixel[0] = i;
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| pixel[1] = i;
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| image->SetPixel(pixel, 255);
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| }
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| }
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| | |
| </source>
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| | |
| {{ITKCMakeLists|ManuallyRemovingLabels}}
| |
