ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Filtering/LabelMap/KeepRegionsAboveLevel/Code.cxx
/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkImage.h"
using ImageType = itk::Image<unsigned char, 2>;
using LabelImageType = itk::Image<unsigned char, 2>;
static void
CreateImage(ImageType::Pointer image);
int
main(int, char *[])
{
ImageType::Pointer image = ImageType::New();
CreateImage(image);
using BinaryImageToLabelMapFilterType = itk::BinaryImageToLabelMapFilter<ImageType>;
BinaryImageToLabelMapFilterType::Pointer binaryImageToLabelMapFilter = BinaryImageToLabelMapFilterType::New();
binaryImageToLabelMapFilter->SetInput(image);
binaryImageToLabelMapFilter->Update();
using LabelMapToLabelImageFilterType =
LabelMapToLabelImageFilterType::Pointer labelMapToLabelImageFilter = LabelMapToLabelImageFilterType::New();
labelMapToLabelImageFilter->SetInput(binaryImageToLabelMapFilter->GetOutput());
labelMapToLabelImageFilter->Update();
using LabelShapeKeepNObjectsImageFilterType = itk::LabelShapeKeepNObjectsImageFilter<LabelImageType>;
LabelShapeKeepNObjectsImageFilterType::Pointer labelShapeKeepNObjectsImageFilter =
LabelShapeKeepNObjectsImageFilterType::New();
labelShapeKeepNObjectsImageFilter->SetInput(labelMapToLabelImageFilter->GetOutput());
labelShapeKeepNObjectsImageFilter->SetBackgroundValue(0);
labelShapeKeepNObjectsImageFilter->SetNumberOfObjects(2);
// KeepNObjects->ReverseOrderingOn();
// labelShapeKeepNObjectsImageFilter->SetAttribute( LabelObjectType::PERIMETER );
labelShapeKeepNObjectsImageFilter->SetAttribute(LabelShapeKeepNObjectsImageFilterType::LabelObjectType::PERIMETER);
labelShapeKeepNObjectsImageFilter->Update();
using RGBPixelType = itk::RGBPixel<unsigned char>;
using RGBImageType = itk::Image<RGBPixelType, 2>;
// Color each label/object a different color
RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
colormapImageFilter->SetInput(labelShapeKeepNObjectsImageFilter->GetOutput());
colormapImageFilter->Update();
WriterType::Pointer writer = WriterType::New();
writer->SetInput(colormapImageFilter->GetOutput());
writer->SetFileName("output.png");
writer->Update();
return EXIT_SUCCESS;
}
void
CreateImage(ImageType::Pointer image)
{
// Create a black image with three white squares
start.Fill(0);
size.Fill(200);
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
itk::ImageRegionIterator<ImageType> imageIterator(image, image->GetLargestPossibleRegion());
// Make a square
while (!imageIterator.IsAtEnd())
{
if (((imageIterator.GetIndex()[0] > 5 && imageIterator.GetIndex()[0] < 20) &&
(imageIterator.GetIndex()[1] > 5 && imageIterator.GetIndex()[1] < 20)) ||
((imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 60) &&
(imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 60)) ||
((imageIterator.GetIndex()[0] > 100 && imageIterator.GetIndex()[0] < 130) &&
(imageIterator.GetIndex()[1] > 100 && imageIterator.GetIndex()[1] < 130)))
{
imageIterator.Set(255);
}
else
{
imageIterator.Set(0);
}
++imageIterator;
}
using WriterType = itk::ImageFileWriter<ImageType>;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName("input.png");
writer->SetInput(image);
writer->Update();
}
itk::RGBPixel
Represent Red, Green and Blue components for color images.
Definition: itkRGBPixel.h:58
itk::LabelShapeKeepNObjectsImageFilter
keep N objects according to their shape attributes
Definition: itkLabelShapeKeepNObjectsImageFilter.h:52
itkLabelShapeKeepNObjectsImageFilter.h
itk::ScalarToRGBColormapImageFilter
Implements pixel-wise intensity->rgb mapping operation on one image.
Definition: itkScalarToRGBColormapImageFilter.h:131
itk::GTest::TypedefsAndConstructors::Dimension2::SizeType
ImageBaseType::SizeType SizeType
Definition: itkGTestTypedefsAndConstructors.h:49
itkImage.h
itkImageRegionIterator.h
itk::ScalarToRGBColormapImageFilterEnums::RGBColormapFilter::Jet
itk::Index::Fill
void Fill(IndexValueType value)
Definition: itkIndex.h:270
itk::BinaryImageToLabelMapFilter
Label the connected components in a binary image and produce a collection of label objects.
Definition: itkBinaryImageToLabelMapFilter.h:56
itk::Size::Fill
void Fill(SizeValueType value)
Definition: itkSize.h:211
itk::ImageRegionIterator
A multi-dimensional iterator templated over image type that walks a region of pixels.
Definition: itkImageRegionIterator.h:78
itk::GTest::TypedefsAndConstructors::Dimension2::IndexType
ImageBaseType::IndexType IndexType
Definition: itkGTestTypedefsAndConstructors.h:50
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itk::GTest::TypedefsAndConstructors::Dimension2::RegionType
ImageBaseType::RegionType RegionType
Definition: itkGTestTypedefsAndConstructors.h:54
itkBinaryImageToLabelMapFilter.h
itk::ImageRegionIterator::Set
void Set(const PixelType &value) const
Definition: itkImageRegionIterator.h:114
itkImageFileWriter.h
itkScalarToRGBColormapImageFilter.h
itk::LabelMapToLabelImageFilter
Converts a LabelMap to a labeled image.
Definition: itkLabelMapToLabelImageFilter.h:47
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86
itkLabelMapToLabelImageFilter.h
itk::ImageRegion::SetSize
void SetSize(const SizeType &size)
Definition: itkImageRegion.h:174