ITK  5.0.0
Insight Segmentation and Registration Toolkit
WikiExamples/Images/ShrinkImageFilter.cxx
#include "itkImage.h"
using ImageType = itk::Image<unsigned char, 2>;
static void CreateImage(ImageType::Pointer image);
int main(int, char *[])
{
ImageType::Pointer image = ImageType::New();
CreateImage(image);
std::cout << "Original size: " << image->GetLargestPossibleRegion().GetSize() << std::endl;
using ShrinkImageFilterType = itk::ShrinkImageFilter <ImageType, ImageType>;
ShrinkImageFilterType::Pointer shrinkFilter
= ShrinkImageFilterType::New();
shrinkFilter->SetInput(image);
shrinkFilter->SetShrinkFactor(0, 2); // shrink the first dimension by a factor of 2 (i.e. 100 gets changed to 50)
shrinkFilter->SetShrinkFactor(1, 3); // shrink the second dimension by a factor of 3 (i.e. 100 gets changed to 33)
shrinkFilter->Update();
std::cout << "New size: " << shrinkFilter->GetOutput()->GetLargestPossibleRegion().GetSize() << std::endl;
return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image)
{
// Create an image with 2 connected components
start.Fill(0);
size.Fill(100);
ImageType::RegionType region(start, size);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
// Make a white square
for(unsigned int r = 20; r < 80; r++)
{
for(unsigned int c = 20; c < 30; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
}