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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.
*
*=========================================================================*/
#ifndef itkSampleClassifierFilter_hxx
#define itkSampleClassifierFilter_hxx
#include "itkSampleClassifierFilter.h"
namespace itk
{
namespace Statistics
{
template< typename TSample >
SampleClassifierFilter< TSample >
::SampleClassifierFilter()
{
this->m_NumberOfClasses = 0;
this->SetNumberOfRequiredInputs(3);
this->SetNumberOfRequiredOutputs(1);
this->ProcessObject::SetNthOutput( 0, this->MakeOutput(0) );
/** Initialize decision rule */
m_DecisionRule = ITK_NULLPTR;
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "NumberofClasses: "
<< this->GetNumberOfClasses() << std::endl;
os << indent << "DecisionRule: "
<< this->GetDecisionRule() << std::endl;
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::SetInput(const TSample *sample)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput( 0,
const_cast< SampleType * >( sample ) );
}
template< typename TSample >
const TSample *
SampleClassifierFilter< TSample >
::GetInput() const
{
return itkDynamicCastInDebugMode< const SampleType * >( this->GetPrimaryInput() );
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::SetClassLabels(const ClassLabelVectorObjectType *classLabels)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput( 1,
const_cast< ClassLabelVectorObjectType * >( classLabels ) );
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::SetMembershipFunctions(const MembershipFunctionVectorObjectType *membershipFunctions)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput( 2,
const_cast< MembershipFunctionVectorObjectType * >( membershipFunctions ) );
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::SetMembershipFunctionsWeightsArray(const
MembershipFunctionsWeightsArrayObjectType *weightsArray)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput( 3,
const_cast<
MembershipFunctionsWeightsArrayObjectType * >( weightsArray ) );
}
template< typename TSample >
typename SampleClassifierFilter< TSample >::DataObjectPointer
SampleClassifierFilter< TSample >
::MakeOutput(DataObjectPointerArraySizeType)
{
return MembershipSampleType::New().GetPointer();
}
template< typename TSample >
void
SampleClassifierFilter< TSample >
::GenerateData()
{
const ClassLabelVectorObjectType *classLabelsDecorated =
static_cast< const ClassLabelVectorObjectType * >( this->ProcessObject::GetInput(1) );
const MembershipFunctionVectorObjectType *membershipFunctionsDecorated =
static_cast< const MembershipFunctionVectorObjectType * >( this->ProcessObject::GetInput(2) );
const MembershipFunctionsWeightsArrayObjectType *
membershipFunctionsWeightsArrayDecorated =
static_cast< const MembershipFunctionsWeightsArrayObjectType * >( this->ProcessObject::GetInput(3) );
const ClassLabelVectorType & classLabels = classLabelsDecorated->Get();
const MembershipFunctionVectorType & membershipFunctions = membershipFunctionsDecorated->Get();
// Check number of Labels and MembershipSamples against the number of classes
// */
if ( membershipFunctions.size() != this->m_NumberOfClasses )
{
itkExceptionMacro("Number of Membership functions does not match the number of classes");
}
if ( classLabels.size() != this->m_NumberOfClasses )
{
itkExceptionMacro("Number of class labels does not match the number of classes");
}
if ( m_DecisionRule.IsNull() )
{
itkExceptionMacro("Decision rule is not set");
}
MembershipFunctionsWeightsArrayType membershipFunctionsWeightsArray;
if ( membershipFunctionsWeightsArrayDecorated == ITK_NULLPTR )
{
// no weights array is set and hence all membership functions will have
// equal
// weight
membershipFunctionsWeightsArray.SetSize(this->m_NumberOfClasses);
membershipFunctionsWeightsArray.Fill(1.0);
}
else
{
membershipFunctionsWeightsArray = membershipFunctionsWeightsArrayDecorated->Get();
}
if ( membershipFunctionsWeightsArray.Size() != this->m_NumberOfClasses
)
{
itkExceptionMacro(
"Membership functions weight array size does not match the\
number of classes " );
}
const SampleType *sample =
static_cast< const SampleType * >( this->ProcessObject::GetInput(0) );
std::vector< double > discriminantScores;
discriminantScores.resize(this->m_NumberOfClasses);
MembershipSampleType *output = dynamic_cast< MembershipSampleType * >(
this->ProcessObject::GetOutput(0) );
output->SetSample( this->GetInput() );
output->SetNumberOfClasses(this->m_NumberOfClasses);
typename TSample::ConstIterator iter = sample->Begin();
typename TSample::ConstIterator end = sample->End();
while ( iter != end )
{
typename TSample::MeasurementVectorType measurements;
measurements = iter.GetMeasurementVector();
for ( unsigned int i = 0; i < this->m_NumberOfClasses; i++ )
{
discriminantScores[i] = membershipFunctionsWeightsArray[i]
* membershipFunctions[i]->Evaluate(measurements);
}
const size_t classIndex = m_DecisionRule->Evaluate(discriminantScores);
output->AddInstance( classLabels[classIndex], iter.GetInstanceIdentifier() );
++iter;
}
}
template< typename TSample >
const typename SampleClassifierFilter< TSample >::MembershipSampleType *
SampleClassifierFilter< TSample >
::GetOutput() const
{
return static_cast< const MembershipSampleType * >( this->ProcessObject::GetOutput(0) );
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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