ITK  5.0.0
Insight Segmentation and Registration Toolkit
WikiExamples/ImageProcessing/RegionalMaximaImageFilter.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);
using RegionalMaximaImageFilter = itk::RegionalMaximaImageFilter <ImageType, ImageType >;
RegionalMaximaImageFilter::Pointer filter
= RegionalMaximaImageFilter::New ();
filter->SetInput(image);
WriterType::Pointer writer = WriterType::New();
writer->SetFileName("intensityblobs.png");
writer->SetInput( image );
writer->Update();
writer->SetFileName("maximal.png");
writer->SetInput( filter->GetOutput() );
writer->Update();
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] = NumCols;
size[1] = NumRows;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
// Make two intensity blobs
for(unsigned int r = 0; r < NumRows; r++)
{
for(unsigned int c = 0; c < NumCols; c++)
{
pixelIndex[0] = c;
pixelIndex[1] = r;
double c1 = c - 100.0;
double c2 = c - 200.0;
double rr = r - 100.0;
// purposely use 270,257 since it is > 255
double v1 = 270.0 - vcl_sqrt( rr*rr + c1*c1 );
double v2 = 257.0 - vcl_sqrt( rr*rr + c2*c2 );
double maxv = v1;
if( maxv < v2 ) maxv = v2;
double val = maxv;
if( val < 0.0 ) val = 0.0;
if( val > 255.0 ) val = 255.0;
image->SetPixel(pixelIndex, val);
}
}
}