ITK  4.13.0
Insight Segmentation and Registration Toolkit
WikiExamples/ImageProcessing/SubtractImageFilter_Constant.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);
SubtractImageFilterType::Pointer subtractConstantFromImageFilter = SubtractImageFilterType::New();
subtractConstantFromImageFilter->SetInput(image);
subtractConstantFromImageFilter->SetConstant2(2);
subtractConstantFromImageFilter->Update();
WriterType::Pointer writer = WriterType::New();
writer->SetFileName("output.png");
writer->SetInput(subtractConstantFromImageFilter->GetOutput());
writer->Update();
return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image)
{
start.Fill(0);
size.Fill(100);
ImageType::RegionType region;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
itk::ImageRegionIterator<ImageType> imageIterator(image,region);
while(!imageIterator.IsAtEnd())
{
if(imageIterator.GetIndex()[0] < 70)
{
imageIterator.Set(255);
}
else
{
imageIterator.Set(0);
}
++imageIterator;
}
}