ITK  4.9.0
Insight Segmentation and Registration Toolkit
Examples/Segmentation/CellularSegmentation1.cxx
/*=========================================================================
*
* 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
//
// \index{itk::bio::CellularAggregate}
//
// The following example illustrates the use of Cellular Algorithms for performing image segmentation.
// Cellular algorithms are implemented by combining the following classes
//
// \subdoxygen{bio}{CellularAggregate}
// \subdoxygen{bio}{Cell}
//
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
// Software Guide : EndCodeSnippet
int main( int argc, char *argv[] )
{
if( argc < 8 )
{
std::cerr << "Missing Parameters " << std::endl;
std::cerr << "Usage: " << argv[0];
std::cerr << " inputImage seedX seedY lowThreshold highThreshold iterations outputMesh.vtk" << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// We now define the image type using a pixel type and a particular
// dimension. In this case the \code{float} type is used for the pixels due
// to the requirements of the smoothing filter.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef float InternalPixelType;
const unsigned int Dimension = 2;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The \subdoxygen{bio}{CellularAggregate} class must be instantiated using
// the dimension of the image to be segmented.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::bio::CellularAggregate< Dimension > CellularAggregateType;
typedef CellularAggregateType::BioCellType CellType;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Then an object of this class can be constructed by invoking the
// \code{New} operator and receiving the result in a \code{SmartPointer},
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
CellularAggregateType::Pointer cellularAggregate
= CellularAggregateType::New();
// Software Guide : EndCodeSnippet
// We instantiate reader and writer types
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName( argv[1] );
std::cout << "Filename = " << argv[1] << std::endl;
try
{
reader->Update();
}
catch( itk::ExceptionObject & excep )
{
std::cerr << "Exception caught !" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// The CellularAggregate considers the image as a chemical substrate in
// which the Cells are going to develop. The intensity values of the image
// will influence the behavior of the Cells, in particular they will
// intervine to regulate the Cell Cycle. A Cellular Aggregate could be
// gathering information from several images simultaneously, in this context
// each image can bee seen as a map of concentration of a particular
// chemical compound. The set of images will describe the chemical
// composition of the extra cellular matrix.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
cellularAggregate->AddSubstrate( reader->GetOutput() );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The initialization of the algorithm requires the user to provide a seed
// point. It is convenient to select this point to be placed in a
// \emph{typical} region of the anatomical structure to be segmented. A
// small neighborhood around the seed point will be used to compute the
// initial mean and standard deviation for the inclusion criterion. The
// seed is passed in the form of a \doxygen{Index} to the \code{SetSeed()}
// method.
//
// \index{itk::ConfidenceConnectedImageFilter!SetSeed()}
// \index{itk::ConfidenceConnectedImageFilter!SetInitialNeighborhoodRadius()}
//
// Software Guide : EndLatex
ImageType::IndexType index;
index[0] = atoi( argv[2] );
index[1] = atoi( argv[3] );
CellType::PointType position;
reader->GetOutput()->TransformIndexToPhysicalPoint( index, position );
std::cout << "Egg position index = " << index << std::endl;
std::cout << "Egg position point = " << position << std::endl;
// Software Guide : BeginLatex
//
// Individual Cell do not derive from the \doxygen{Object} class in order to
// avoid the penalties of Mutex operations when passing pointers to them.
// The Creation of a new cell is done by invoking the normal \code{new}
// operator.
//
// \index{itk::bio::Cell!Creation}
// \index{itk::bio::Cell!pointer}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
CellType * egg = CellType::CreateEgg();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// In this particular example, the Cell cycle is going to be controled
// mostly by the intensity values of the image. These values are asimilated
// to concentrations of a particular chemical compound. Cell will feel
// compfortable at when the concentration of this chemical is inside a
// particular range. In this circumstances cells will be able to
// proliferate. When the chemical concentration is out of the range, cell
// will not enter their division stage and will anchor to the cellular
// matrix. The values defining this range can be set by invoking the methods
// \code{SetChemoAttractantHighThreshold} and
// \code{SetChemoAttractantLowThreshold). These to methods are static and
// set the values to be used by all the cells.
//
// \index{itk::bio::Cell!SetChemoAttractantLowThreshold}
// \index{itk::bio::Cell!SetChemoAttractantHighThreshold}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
CellType::SetChemoAttractantLowThreshold( atof( argv[4] ) );
CellType::SetChemoAttractantHighThreshold( atof( argv[5] ) );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The newly created Cell is passed to the \code{CellularAggregate} object
// that will take care of controling the development of the cells.
//
// \index{itk::bio::CellularAggregate!SetEgg}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
cellularAggregate->SetEgg( egg, position );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The CellularAggregate will update the life cycle of all the cells in an
// iterative way. The User must select how many iterations to run.
// CellularAlgorithms can in principle run forever. It is up to the User to
// define an stopping criterion. One of the simplest options is to set a
// limit to the number of iterations, by invoking the AdvanceTimeStep()
// method inside a for loop.
//
// \index{itk::bio::CellularAggregate!SetEgg}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
unsigned int numberOfIterations = atoi( argv[6] );
std::cout << "numberOfIterations " << numberOfIterations << std::endl;
for(unsigned int i=0; i<numberOfIterations; i++)
{
cellularAggregate->AdvanceTimeStep();
}
// Software Guide : EndCodeSnippet
std::cout << " Final number of Cells = " << cellularAggregate->GetNumberOfCells() << std::endl;
// Write the mesh to a file
//
WriterType::Pointer writer = WriterType::New();
writer->SetInput( cellularAggregate->GetMesh() );
writer->SetFileName( argv[7] );
try
{
writer->Update();
}
catch( itk::ExceptionObject & excep )
{
std::cerr << "Exception caught !" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}