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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// The \doxygen{RelabelComponentImageFilter} is commonly used for reorganizing
// the labels in an image that has been produced as the result of a
// segmentation method. For example, region growing, or a K-means statistical
// classification.
//
// \index{itk::RelabelComponentImageFilter}
//
// Software Guide : EndLatex
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
// Software Guide : BeginLatex
//
// The header file corresponding to this filter should be included first.
//
// \index{itk::RelabelComponentImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkRelabelComponentImageFilter.h"
// Software Guide : EndCodeSnippet
int main( int argc, char * argv[] )
{
if( argc < 3 )
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile" << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// Then the pixel types for input and output image must be defined and, with
// them, the image types can be instantiated.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef unsigned char InputPixelType;
typedef unsigned char OutputPixelType;
typedef itk::Image< InputPixelType, 2 > InputImageType;
typedef itk::Image< OutputPixelType, 2 > OutputImageType;
// Software Guide : EndCodeSnippet
typedef itk::ImageFileReader< InputImageType > ReaderType;
typedef itk::ImageFileWriter< OutputImageType > WriterType;
ReaderType::Pointer reader = ReaderType::New();
WriterType::Pointer writer = WriterType::New();
reader->SetFileName( argv[1] );
writer->SetFileName( argv[2] );
// Software Guide : BeginLatex
//
// Using the image types it is now possible to instantiate the filter type
// and create the filter object.
//
// \index{itk::RelabelComponentImageFilter!instantiation}
// \index{itk::RelabelComponentImageFilter!New()}
// \index{itk::RelabelComponentImageFilter!Pointer}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::RelabelComponentImageFilter<
InputImageType, OutputImageType > FilterType;
FilterType::Pointer relabeler = FilterType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The input to the filter can be taken from any other filter, for example
// a reader. The output can be passed down the pipeline to other filters,
// for example, a writer. An update call on any downstream filter will
// trigger the execution of the mean filter.
//
// \index{itk::RelabelComponentImageFilter!SetInput()}
// \index{itk::RelabelComponentImageFilter!GetOutput()}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
relabeler->SetInput( reader->GetOutput() );
writer->SetInput( relabeler->GetOutput() );
writer->Update();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// We can now query the size of each one of the connected components, both in
// pixel units and in physical units.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef std::vector< itk::SizeValueType > SizesInPixelsType;
const SizesInPixelsType & sizesInPixels
= relabeler->GetSizeOfObjectsInPixels();
SizesInPixelsType::const_iterator sizeItr = sizesInPixels.begin();
SizesInPixelsType::const_iterator sizeEnd = sizesInPixels.end();
std::cout << "Number of pixels per class " << std::endl;
unsigned int kclass = 0;
while (sizeItr != sizeEnd)
{
std::cout << "Class " << kclass << " = " << *sizeItr << std::endl;
++kclass;
++sizeItr;
}
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
typedef std::vector< float > SizesInPhysicalUnitsType;
const SizesInPhysicalUnitsType sizesInUnits
= relabeler->GetSizeOfObjectsInPhysicalUnits();
SizesInPhysicalUnitsType::const_iterator physicalSizeItr
= sizesInUnits.begin();
SizesInPhysicalUnitsType::const_iterator physicalSizeEnd
= sizesInUnits.end();
std::cout << "Area in Physical Units per class " << std::endl;
unsigned int jclass = 0;
while( physicalSizeItr != physicalSizeEnd )
{
std::cout << "Class " << jclass << " = " << *physicalSizeItr << std::endl;
++jclass;
++physicalSizeItr;
}
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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