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| ==Description== | | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| Relabel the components (blobs) in an image such that consecutive labels are used. This example creates a black image with one rectangle consisting of pixels with value 100 and a second rectangle consisting of pixels with value 200. There are three resulting components (the background and the two rectangles). The relabel filter labels these three components 0, 1, and 2.
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| ==Displayed Output==
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| The original image and an intensity scaled version of the relabeled image. | |
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| ==RelabelComponentImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkCustomColormapFunction.h"
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| #include "itkScalarToRGBColormapImageFilter.h"
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| #include "itkRGBPixel.h"
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| #include "itkMersenneTwisterRandomVariateGenerator.h"
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| #include "itkRelabelComponentImageFilter.h"
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| #include "QuickView.h"
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| typedef itk::RGBPixel<unsigned char> RGBPixelType;
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| typedef itk::Image<RGBPixelType, 2> RGBImageType;
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| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::Function::CustomColormapFunction<
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| ImageType::PixelType, RGBImageType::PixelType> ColormapType;
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| static void CreateImage(
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| ImageType::Pointer image);
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| static void CreateRandomColormap(\
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| unsigned int size, ColormapType::Pointer colormap);
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| int main(int, char *[])
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| {
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| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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|
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| typedef itk::RelabelComponentImageFilter<ImageType, ImageType> FilterType;
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| FilterType::Pointer relabelFilter =
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| FilterType::New();
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| relabelFilter->SetInput(image);
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| typedef itk::ScalarToRGBColormapImageFilter<ImageType, RGBImageType> ColormapFilterType;
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| ColormapFilterType::Pointer colormapFilter1 =
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| ColormapFilterType::New();
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| ColormapType::Pointer largeColormap
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| = ColormapType::New();
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| CreateRandomColormap(255, largeColormap);
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| colormapFilter1->SetInput (image);
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| colormapFilter1->SetColormap(largeColormap);
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| ColormapFilterType::Pointer colormapFilter2 =
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| ColormapFilterType::New();
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| colormapFilter2->SetInput (relabelFilter->GetOutput());
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| colormapFilter2->SetColormap(largeColormap);
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| QuickView viewer;
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| viewer.AddRGBImage(
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| colormapFilter1->GetOutput(),
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| true,
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| "Original");
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| viewer.AddRGBImage(
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| colormapFilter2->GetOutput(),
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| true,
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| "Relabeled");
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| viewer.Visualize();
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| return EXIT_SUCCESS;
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| }
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| void CreateImage(ImageType::Pointer image)
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| {
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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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| size[0] = 200;
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| size[1] = 300;
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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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| itk::ImageRegionIterator<ImageType> imageIterator(image,region); | |
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| while(!imageIterator.IsAtEnd())
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| {
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| if(imageIterator.GetIndex()[0] > 100 &&
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| imageIterator.GetIndex()[0] < 150 &&
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| imageIterator.GetIndex()[1] > 100 &&
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| imageIterator.GetIndex()[1] < 150)
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| {
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| imageIterator.Set(200);
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| }
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| else if(imageIterator.GetIndex()[0] > 50 &&
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| imageIterator.GetIndex()[0] < 70 &&
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| imageIterator.GetIndex()[1] > 50 &&
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| imageIterator.GetIndex()[1] < 70)
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| {
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| imageIterator.Set(100);
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| }
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| else
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| {
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| imageIterator.Set(0);
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| }
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| ++imageIterator;
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| }
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| }
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| void CreateRandomColormap(unsigned int size, ColormapType::Pointer colormap)
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| {
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| ColormapType::ChannelType redChannel;
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| ColormapType::ChannelType greenChannel;
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| ColormapType::ChannelType blueChannel;
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| itk::Statistics::MersenneTwisterRandomVariateGenerator::Pointer random =
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| itk::Statistics::MersenneTwisterRandomVariateGenerator::New();
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| random->SetSeed ( 8775070 );
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| for (unsigned int i = 0; i < size; ++i)
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| {
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| redChannel.push_back(static_cast<ColormapType::RealType>
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| (random->GetUniformVariate(.3, 1.0)));
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| greenChannel.push_back(static_cast<ColormapType::RealType>
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| (random->GetUniformVariate(.3, 1.0)));
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| blueChannel.push_back(static_cast<ColormapType::RealType>
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| (random->GetUniformVariate(.3, 1.0)));
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| }
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| colormap->SetRedChannel(redChannel);
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| colormap->SetGreenChannel(greenChannel);
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| colormap->SetBlueChannel(blueChannel);
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| }
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| </source>
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| {{ITKVTKCMakeLists|RelabelComponentImageFilter|}}
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