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| <div class="floatcenter">[[File:ITK_Examples_Baseline_SimpleOperations_TestCustomColormap.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| ==CustomColormap.cxx==
| | }} |
| <source lang="cpp">
| |
| #include "itkCustomColormapFunction.h"
| |
| #include "itkScalarToRGBColormapImageFilter.h"
| |
|
| |
|
| #include "itkImage.h"
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| #include "itkImageFileReader.h"
| |
| #include "itkCustomColormapFunction.h"
| |
| #include "itkScalarToRGBColormapImageFilter.h"
| |
| #include "itkRGBPixel.h"
| |
| #include "itkMersenneTwisterRandomVariateGenerator.h"
| |
| | |
| #include "QuickView.h"
| |
| | |
| typedef itk::RGBPixel<unsigned char> RGBPixelType;
| |
| typedef itk::Image<RGBPixelType, 2> RGBImageType;
| |
| typedef itk::Image<unsigned char, 2> ImageType;
| |
| typedef itk::Function::CustomColormapFunction<
| |
| ImageType::PixelType, RGBImageType::PixelType> ColormapType;
| |
| | |
| static void CreateRandomImage(
| |
| ImageType::Pointer image, unsigned int width = 200, unsigned height = 300);
| |
| static void CreateRandomColormap(
| |
| ColormapType::Pointer colormap, unsigned int size = 255);
| |
| | |
| int main(int, char *[])
| |
| {
| |
| ImageType::Pointer image = ImageType::New();
| |
| | |
| CreateRandomImage(image);
| |
|
| |
| typedef itk::ScalarToRGBColormapImageFilter<ImageType, RGBImageType> ColormapFilterType;
| |
| ColormapFilterType::Pointer colormapFilter1 =
| |
| ColormapFilterType::New();
| |
| | |
| ColormapType::Pointer largeColormap
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| = ColormapType::New();
| |
| CreateRandomColormap(largeColormap, 255);
| |
| | |
| colormapFilter1->SetInput (image);
| |
| colormapFilter1->SetColormap(largeColormap);
| |
| | |
| QuickView viewer;
| |
| viewer.AddRGBImage(
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| colormapFilter1->GetOutput(),
| |
| true);
| |
| | |
| viewer.Visualize();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void CreateRandomImage(ImageType::Pointer image,\
| |
| unsigned int width,
| |
| unsigned height)
| |
| {
| |
| itk::Statistics::MersenneTwisterRandomVariateGenerator::Pointer random =
| |
| itk::Statistics::MersenneTwisterRandomVariateGenerator::New();
| |
| // Create an image with 2 connected components
| |
| ImageType::RegionType region;
| |
| ImageType::IndexType start;
| |
| start[0] = 0;
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| start[1] = 0;
| |
| | |
| ImageType::SizeType size;
| |
| size[0] = width;
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| size[1] = height;
| |
| | |
| region.SetSize(size);
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| region.SetIndex(start);
| |
| | |
| image->SetRegions(region);
| |
| image->Allocate();
| |
| | |
| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
| |
| | |
| unsigned int cnt = 0;
| |
| | |
| ImageType::PixelType value = random->GetUniformVariate(0.0, 255.0);
| |
| unsigned int bandSize = 5;
| |
| while(!imageIterator.IsAtEnd())
| |
| {
| |
| if (cnt % (size[0] * bandSize) == 0)
| |
| {
| |
| value = random->GetUniformVariate(0.0, 255.0);
| |
| bandSize = static_cast<unsigned int>(random->GetUniformVariate(5, 10));
| |
| }
| |
| imageIterator.Set(static_cast<ImageType::PixelType>(value));
| |
| ++imageIterator;
| |
| ++cnt;
| |
| }
| |
| }
| |
| | |
| void CreateRandomColormap(ColormapType::Pointer colormap, unsigned int size)
| |
| {
| |
| ColormapType::ChannelType redChannel;
| |
| ColormapType::ChannelType greenChannel;
| |
| ColormapType::ChannelType blueChannel;
| |
| itk::Statistics::MersenneTwisterRandomVariateGenerator::Pointer random =
| |
| itk::Statistics::MersenneTwisterRandomVariateGenerator::New();
| |
| | |
| random->SetSeed ( 8775070 );
| |
| for (unsigned int i = 0; i < size; ++i)
| |
| {
| |
| redChannel.push_back(static_cast<ColormapType::RealType>
| |
| (random->GetUniformVariate(.3, 1.0)));
| |
| greenChannel.push_back(static_cast<ColormapType::RealType>
| |
| (random->GetUniformVariate(.3, 1.0)));
| |
| blueChannel.push_back(static_cast<ColormapType::RealType>
| |
| (random->GetUniformVariate(.3, 1.0)));
| |
| }
| |
| colormap->SetRedChannel(redChannel);
| |
| colormap->SetGreenChannel(greenChannel);
| |
| colormap->SetBlueChannel(blueChannel);
| |
| }
| |
| </source>
| |
| {{ITKVTKCMakeLists|CustomColormap|}}
| |
