ITK  4.9.0
Insight Segmentation and Registration Toolkit
WikiExamples/ImageProcessing/BinaryImageToShapeLabelMapFilter.cxx
#include "itkImage.h"
typedef itk::Image<unsigned char, 2> ImageType;
static void CreateImage(ImageType::Pointer image);
int main(int, char *[])
{
ImageType::Pointer image = ImageType::New();
CreateImage(image);
typedef itk::BinaryImageToShapeLabelMapFilter<ImageType> BinaryImageToShapeLabelMapFilterType;
BinaryImageToShapeLabelMapFilterType::Pointer binaryImageToShapeLabelMapFilter = BinaryImageToShapeLabelMapFilterType::New();
binaryImageToShapeLabelMapFilter->SetInput(image);
binaryImageToShapeLabelMapFilter->Update();
// The output of this filter is an itk::ShapeLabelMap, which contains itk::ShapeLabelObject's
std::cout << "There are " << binaryImageToShapeLabelMapFilter->GetOutput()->GetNumberOfLabelObjects() << " objects." << std::endl;
// Loop over all of the blobs
for(unsigned int i = 0; i < binaryImageToShapeLabelMapFilter->GetOutput()->GetNumberOfLabelObjects(); i++)
{
BinaryImageToShapeLabelMapFilterType::OutputImageType::LabelObjectType* labelObject = binaryImageToShapeLabelMapFilter->GetOutput()->GetNthLabelObject(i);
// Output the bounding box (an example of one possible property) of the ith region
#if ITK_VERSION_MAJOR >= 4
std::cout << "Object " << i << " has bounding box " << labelObject->GetBoundingBox() << std::endl;
#else
std::cout << "Object " << i << " has region " << labelObject->GetRegion() << std::endl;
#endif
}
return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image)
{
// Create a black image with a white square
ImageType::IndexType start;
start.Fill(0);
ImageType::SizeType size;
size.Fill(20);
ImageType::RegionType region;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
itk::ImageRegionIterator<ImageType> imageIterator(image,image->GetLargestPossibleRegion());
// Make a square
while(!imageIterator.IsAtEnd())
{
if((imageIterator.GetIndex()[0] > 5 && imageIterator.GetIndex()[0] < 10) &&
(imageIterator.GetIndex()[1] > 5 && imageIterator.GetIndex()[1] < 10) )
{
imageIterator.Set(255);
}
else
{
imageIterator.Set(0);
}
++imageIterator;
}
WriterType::Pointer writer = WriterType::New();
writer->SetFileName("image.png");
writer->SetInput(image);
writer->Update();
}