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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 itkLevelSetEquationChanAndVeseInternalTerm_hxx
#define itkLevelSetEquationChanAndVeseInternalTerm_hxx
namespace itk
{
template <typename TInput, typename TLevelSetContainer>
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::LevelSetEquationChanAndVeseInternalTerm()
: m_Mean(InputPixelRealType{})
, m_TotalValue(InputPixelRealType{})
, m_TotalH(LevelSetOutputRealType{})
{
this->m_TermName = "Internal Chan And Vese term";
this->m_RequiredData.insert("Value");
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::Update()
{
if (this->m_TotalH > NumericTraits<LevelSetOutputRealType>::epsilon())
{
const LevelSetOutputRealType inv_total_h = 1. / this->m_TotalH;
// depending on the pixel type, it may be more efficient to do
// a multiplication than to do a division
this->m_Mean = this->m_TotalValue * inv_total_h;
}
else
{
this->m_Mean = InputPixelRealType{};
}
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::InitializeParameters()
{
this->m_TotalValue = InputPixelRealType{};
this->m_TotalH = LevelSetOutputRealType{};
this->SetUp();
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::Initialize(
const LevelSetInputIndexType & inputIndex)
{
if (this->m_Heaviside.IsNotNull())
{
InputPixelType pixel = this->m_Input->GetPixel(inputIndex);
LevelSetOutputRealType prod;
this->ComputeProduct(inputIndex, prod);
this->Accumulate(pixel, prod);
}
else
{
itkWarningMacro("m_Heaviside is nullptr");
}
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::ComputeProduct(
const LevelSetInputIndexType & inputIndex,
LevelSetOutputRealType & prod)
{
LevelSetOutputRealType value = this->m_CurrentLevelSetPointer->Evaluate(inputIndex);
prod = this->m_Heaviside->Evaluate(-value);
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::UpdatePixel(
const LevelSetInputIndexType & inputIndex,
const LevelSetOutputRealType & oldValue,
const LevelSetOutputRealType & newValue)
{
// For each affected h val: h val = new hval (this will dirty some cvals)
InputPixelType input = this->m_Input->GetPixel(inputIndex);
const LevelSetOutputRealType oldH = this->m_Heaviside->Evaluate(-oldValue);
const LevelSetOutputRealType newH = this->m_Heaviside->Evaluate(-newValue);
const LevelSetOutputRealType change = newH - oldH;
// update the foreground constant for current level-set function
this->m_TotalH += change;
this->m_TotalValue += input * change;
}
template <typename TInput, typename TLevelSetContainer>
auto
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::Value(const LevelSetInputIndexType & inputIndex)
-> LevelSetOutputRealType
{
if (this->m_Heaviside.IsNotNull())
{
const auto value = static_cast<LevelSetOutputRealType>(this->m_CurrentLevelSetPointer->Evaluate(inputIndex));
const LevelSetOutputRealType d_val = this->m_Heaviside->EvaluateDerivative(-value);
const InputPixelType pixel = this->m_Input->GetPixel(inputIndex);
LevelSetOutputRealType prod = 1;
this->ComputeProductTerm(inputIndex, prod);
const LevelSetOutputRealType oValue =
d_val * prod * static_cast<LevelSetOutputRealType>((pixel - this->m_Mean) * (pixel - this->m_Mean));
return oValue;
}
else
{
itkWarningMacro("m_Heaviside is nullptr");
}
return LevelSetOutputPixelType{};
}
template <typename TInput, typename TLevelSetContainer>
auto
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::Value(const LevelSetInputIndexType & inputIndex,
const LevelSetDataType & data)
-> LevelSetOutputRealType
{
if (this->m_Heaviside.IsNotNull())
{
const LevelSetOutputRealType value = data.Value.m_Value;
const LevelSetOutputRealType d_val = this->m_Heaviside->EvaluateDerivative(-value);
const InputPixelType pixel = this->m_Input->GetPixel(inputIndex);
LevelSetOutputRealType prod = 1;
this->ComputeProductTerm(inputIndex, prod);
const LevelSetOutputRealType oValue =
d_val * prod * static_cast<LevelSetOutputRealType>((pixel - this->m_Mean) * (pixel - this->m_Mean));
return oValue;
}
else
{
itkWarningMacro("m_Heaviside is nullptr");
}
return LevelSetOutputPixelType{};
}
template <typename TInput, typename TLevelSetContainer>
void
LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>::Accumulate(
const InputPixelType & inputPixel,
const LevelSetOutputRealType & heavisideValue)
{
this->m_TotalValue +=
static_cast<InputPixelRealType>(inputPixel) * static_cast<LevelSetOutputRealType>(heavisideValue);
this->m_TotalH += static_cast<LevelSetOutputRealType>(heavisideValue);
}
} // namespace itk
#endif
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