ITK/Examples/ImageProcessing/ValuedRegionalMaximaImageFilter: Difference between revisions

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Revision as of 13:00, 10 December 2010

ITK Examples ImageProcessing RegionalMaximaImageFilter Input.png ITK Examples ImageProcessing RegionalMaximaImageFilter Output.png

RegionalMaximaImageFilter.cxx

<source lang="cpp">

  1. include "itkImage.h"
  2. include "itkImageFileWriter.h"
  3. include "itkValuedRegionalMaximaImageFilter.h"


typedef itk::Image<unsigned char, 2> ImageType;

void CreateImage(ImageType::Pointer image);

int main(int, char *[]) {

 ImageType::Pointer image = ImageType::New();
 CreateImage(image);
 typedef itk::ValuedRegionalMaximaImageFilter <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(ValuedRegionalMaximaImageFilter)

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

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