ITK/Examples/ImageProcessing/RegionalMaximaImageFilter

RegionalMaximaImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileWriter.h"
3. include "itkRegionalMaximaImageFilter.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::RegionalMaximaImageFilter <ImageType, ImageType >
   RegionalMaximaImageFilter;

 RegionalMaximaImageFilter::Pointer filter
   = RegionalMaximaImageFilter::New ();
 filter->SetInput(image);

 typedef itk::ImageFileWriter< ImageType > WriterType;
 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
 ImageType::RegionType region;
 ImageType::IndexType start;
 start[0] = 0;
 start[1] = 0;

 ImageType::SizeType size;
 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++)
     {
     ImageType::IndexType pixelIndex;
     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);
     }
   }

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(RegionalMaximaImageFilter)

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(RegionalMaximaImageFilter RegionalMaximaImageFilter.cxx) TARGET_LINK_LIBRARIES(RegionalMaximaImageFilter ITKBasicFilters ITKCommon ITKIO) </source>