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/*=========================================================================
*
* 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
*
* https://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 itkLevelSetEquationChanAndVeseExternalTerm_hxx
#define itkLevelSetEquationChanAndVeseExternalTerm_hxx
namespace itk
{
template <typename TInput, typename TLevelSetContainer>
LevelSetEquationChanAndVeseExternalTerm<TInput, TLevelSetContainer>::LevelSetEquationChanAndVeseExternalTerm()
{
this->m_TermName = "External Chan And Vese term";
this->m_RequiredData.insert("Value");
this->m_DomainMapImageFilter = nullptr;
this->m_CacheImage = nullptr;
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseExternalTerm<TInput, TLevelSetContainer>::ComputeProduct(const LevelSetInputIndexType & iP,
LevelSetOutputRealType & prod)
{
this->ComputeProductTerm(iP, prod);
LevelSetPointer levelSet = this->m_LevelSetContainer->GetLevelSet(this->m_CurrentLevelSetId);
LevelSetOutputRealType value = levelSet->Evaluate(iP);
prod *= -(1 - this->m_Heaviside->Evaluate(-value));
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseExternalTerm<TInput, TLevelSetContainer>::ComputeProductTerm(
const LevelSetInputIndexType & iP,
LevelSetOutputRealType & prod)
{
prod = -1 * NumericTraits<LevelSetOutputRealType>::OneValue();
if (this->m_LevelSetContainer->HasDomainMap())
{
if (this->m_DomainMapImageFilter == nullptr)
{
this->m_DomainMapImageFilter = this->m_LevelSetContainer->GetModifiableDomainMapFilter();
this->m_CacheImage = this->m_DomainMapImageFilter->GetOutput();
}
const LevelSetIdentifierType id = this->m_CacheImage->GetPixel(iP);
using DomainMapType = typename DomainMapImageFilterType::DomainMapType;
const DomainMapType domainMap = this->m_DomainMapImageFilter->GetDomainMap();
auto levelSetMapItr = domainMap.find(id);
if (levelSetMapItr != domainMap.end())
{
const IdListType * idList = levelSetMapItr->second.GetIdList();
LevelSetIdentifierType kk;
LevelSetPointer levelSet;
LevelSetOutputRealType value;
auto idListIt = idList->begin();
while (idListIt != idList->end())
{
//! \todo Fix me for string identifiers
kk = *idListIt - 1;
if (kk != this->m_CurrentLevelSetId)
{
levelSet = this->m_LevelSetContainer->GetLevelSet(kk);
value = levelSet->Evaluate(iP);
prod *= (NumericTraits<LevelSetOutputRealType>::OneValue() - this->m_Heaviside->Evaluate(-value));
}
++idListIt;
}
}
}
else
{
LevelSetIdentifierType kk;
LevelSetPointer levelSet;
LevelSetOutputRealType value;
typename LevelSetContainerType::Iterator lsIt = this->m_LevelSetContainer->Begin();
while (lsIt != this->m_LevelSetContainer->End())
{
kk = lsIt->GetIdentifier();
if (kk != this->m_CurrentLevelSetId)
{
levelSet = this->m_LevelSetContainer->GetLevelSet(kk);
value = levelSet->Evaluate(iP);
prod *= (NumericTraits<LevelSetOutputRealType>::OneValue() - this->m_Heaviside->Evaluate(-value));
}
++lsIt;
}
}
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseExternalTerm<TInput, TLevelSetContainer>::UpdatePixel(
const LevelSetInputIndexType & iP,
const LevelSetOutputRealType & oldValue,
const LevelSetOutputRealType & newValue)
{
// Compute the product factor
LevelSetOutputRealType prod;
this->ComputeProductTerm(iP, prod);
// For each affected h val: h val = new hval (this will dirty some cvals)
InputPixelType input = this->m_Input->GetPixel(iP);
const LevelSetOutputRealType oldH = this->m_Heaviside->Evaluate(-oldValue);
const LevelSetOutputRealType newH = this->m_Heaviside->Evaluate(-newValue);
const LevelSetOutputRealType change = oldH - newH; //(1 - newH) - (1 - oldH);
// Determine the change in the product factor
const LevelSetOutputRealType productChange = -(prod * change);
this->m_TotalH += change;
this->m_TotalValue += input * productChange;
}
} // namespace itk
#endif
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