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| [[File:ITK_Examples_ImageProcessing_RegionalMaximaImageFilter_Input.png]]
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions. |
| [[File:ITK_Examples_ImageProcessing_RegionalMaximaImageFilter_Output.png]]
| | }} |
| | |
| ==RegionalMaximaImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileWriter.h"
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| #include "itkValuedRegionalMaximaImageFilter.h"
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| typedef itk::Image<unsigned char, 2> ImageType;
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| void CreateImage(ImageType::Pointer image);
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| int main(int, char *[])
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| { | |
| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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| typedef itk::ValuedRegionalMaximaImageFilter <ImageType, ImageType >
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| RegionalMaximaImageFilter;
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| RegionalMaximaImageFilter::Pointer filter
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| = RegionalMaximaImageFilter::New ();
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| filter->SetInput(image);
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetFileName("intensityblobs.png");
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| writer->SetInput( image );
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| writer->Update();
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| writer->SetFileName("maximal.png");
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| writer->SetInput( filter->GetOutput() );
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| writer->Update();
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| return EXIT_SUCCESS;
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| }
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| void CreateImage(ImageType::Pointer image)
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| { | |
| // Create an image with 2 connected components
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| ImageType::RegionType region;
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| ImageType::IndexType start;
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| start[0] = 0;
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| start[1] = 0;
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| ImageType::SizeType size;
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| unsigned int NumRows = 200;
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| unsigned int NumCols = 300;
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| size[0] = NumCols;
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| size[1] = NumRows;
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| region.SetSize(size);
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| region.SetIndex(start);
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| image->SetRegions(region);
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| image->Allocate();
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| // Make two intensity blobs
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| for(unsigned int r = 0; r < NumRows; r++)
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| {
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| for(unsigned int c = 0; c < NumCols; c++)
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| {
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| ImageType::IndexType pixelIndex;
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| pixelIndex[0] = c;
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| pixelIndex[1] = r;
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| double c1 = c - 100.0;
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| double c2 = c - 200.0;
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| double rr = r - 100.0;
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| // purposely use 270,257 since it is > 255
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| double v1 = 270.0 - vcl_sqrt( rr*rr + c1*c1 );
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| double v2 = 257.0 - vcl_sqrt( rr*rr + c2*c2 );
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| double maxv = v1;
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| if( maxv < v2 ) maxv = v2;
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| double val = maxv;
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| if( val < 0.0 ) val = 0.0;
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| if( val > 255.0 ) val = 255.0;
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| image->SetPixel(pixelIndex, val);
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| }
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| }
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| } | |
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| </source>
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| | |
| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(ValuedRegionalMaximaImageFilter)
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(ValuedRegionalMaximaImageFilter ValuedRegionalMaximaImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(ValuedRegionalMaximaImageFilter
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| ITKBasicFilters ITKCommon ITKIO)
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| </source>
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