ITK  5.0.0
Insight Segmentation and Registration Toolkit
WikiExamples/ImageSegmentation/LabelContourImageFilter.cxx
#include "itkImage.h"
#include "itksys/SystemTools.hxx"
#include <sstream>
#include "QuickView.h"
namespace
{
using PixelType = unsigned char;
using RGBPixelType = itk::RGBPixel<unsigned char>;
using ImageType = itk::Image<PixelType, 2>;
using RGBImageType = itk::Image<RGBPixelType, 2>;
}
static void CreateImage(ImageType::Pointer image);
int main(int argc, char *argv[])
{
// Create or read an image
ImageType::Pointer image;
if( argc < 2 )
{
image = ImageType::New();
CreateImage(image.GetPointer());
}
else
{
using ReaderType = itk::ImageFileReader<ImageType>;
ReaderType::Pointer reader =
ReaderType::New();
reader->SetFileName(argv[1]);
reader->Update();
image = reader->GetOutput();
}
// Generate connected components
using ConnectedComponentImageFilterType = itk::ConnectedComponentImageFilter <ImageType, ImageType >;
ConnectedComponentImageFilterType::Pointer connectedComponentImageFilter
= ConnectedComponentImageFilterType::New ();
connectedComponentImageFilter->SetInput(image);
// Generate contours for each component
using LabelContourImageFilterType = itk::LabelContourImageFilter<ImageType, ImageType>;
LabelContourImageFilterType::Pointer labelContourImageFilter =
LabelContourImageFilterType::New();
labelContourImageFilter->SetInput(connectedComponentImageFilter->GetOutput());
RGBFilterType::Pointer rgbFilter = RGBFilterType::New();
rgbFilter->SetInput( labelContourImageFilter->GetOutput() );
rgbFilter->SetColormap( RGBFilterType::Jet );
QuickView viewer;
viewer.AddImage(
image.GetPointer(),true,
argc > 1 ? itksys::SystemTools::GetFilenameName(argv[1]) : "Generated image");
std::stringstream desc;
desc << "LabelContourImageFilter";
viewer.AddRGBImage(
rgbFilter->GetOutput(),
true,
desc.str());
viewer.Visualize();
return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image)
{
// Create an image with 2 connected components
start[0] = 0;
start[1] = 0;
unsigned int NumRows = 200;
unsigned int NumCols = 300;
size[0] = NumRows;
size[1] = NumCols;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
// Make a square
for(unsigned int r = 20; r < 80; r++)
{
for(unsigned int c = 30; c < 100; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
// Make another square
for(unsigned int r = 100; r < 130; r++)
{
for(unsigned int c = 115; c < 160; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
}