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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 itkScalarRegionBasedLevelSetFunction_hxx
#define itkScalarRegionBasedLevelSetFunction_hxx
namespace itk
{
template <typename TInputImage, typename TFeatureImage, typename TSharedData>
auto
ScalarRegionBasedLevelSetFunction<TInputImage, TFeatureImage, TSharedData>::ComputeOverlapParameters(
const FeatureIndexType & globalIndex,
ScalarValueType & product) -> ScalarValueType
{
// This conditional statement computes the amount of overlap s
// and the presence of background pr
unsigned int fId = this->m_FunctionId;
// accumulates the overlap across all functions
ScalarValueType sum = 0;
product = 1.;
ListPixelType L;
L = this->m_SharedData->m_NearestNeighborListImage->GetPixel(globalIndex);
InputPixelType hVal;
InputIndexType otherIndex;
for (const auto & it : L)
{
if (it != fId)
{
otherIndex = this->m_SharedData->m_LevelSetDataPointerVector[it]->GetIndex(globalIndex);
hVal =
this->m_SharedData->m_LevelSetDataPointerVector[it]->m_HeavisideFunctionOfLevelSetImage->GetPixel(otherIndex);
sum += (1 - hVal);
product *= (1 - hVal);
}
}
return sum;
}
template <typename TInputImage, typename TFeatureImage, typename TSharedData>
void
ScalarRegionBasedLevelSetFunction<TInputImage, TFeatureImage, TSharedData>::UpdatePixel(
const unsigned int idx,
NeighborhoodIterator<TInputImage> & iterator,
InputPixelType & newValue,
bool & itkNotUsed(status))
{
unsigned int fId = this->m_FunctionId;
// For each affected h val: h val = new hval (this will dirty some cvals)
InputIndexType inputIndex = iterator.GetIndex(idx);
FeatureIndexType globalIndex = this->m_SharedData->m_LevelSetDataPointerVector[fId]->GetFeatureIndex(inputIndex);
FeaturePixelType featureVal = this->m_FeatureImage->GetPixel(inputIndex);
ScalarValueType oldH =
this->m_SharedData->m_LevelSetDataPointerVector[fId]->m_HeavisideFunctionOfLevelSetImage->GetPixel(inputIndex);
ScalarValueType newH = this->m_DomainFunction->Evaluate(-newValue);
ScalarValueType change = newH - oldH;
// update the foreground constant for current level-set function
UpdateSharedDataInsideParameters(fId, featureVal, change);
// Compute the product factor
ListPixelType L = this->m_SharedData->m_NearestNeighborListImage->GetPixel(globalIndex);
InputIndexType itInputIndex;
ScalarValueType hVal;
InputPixelType product = 1;
for (ListPixelType::const_iterator it = L.begin(); it != L.end(); ++it)
{
if (*it != fId)
{
itInputIndex = this->m_SharedData->m_LevelSetDataPointerVector[*it]->GetIndex(globalIndex);
hVal = this->m_SharedData->m_LevelSetDataPointerVector[*it]->m_HeavisideFunctionOfLevelSetImage->GetPixel(
itInputIndex);
product *= (1 - hVal);
}
}
// Determine the change in the product factor
ScalarValueType productChange = -(product * change);
// update the background constant of all level-set functions
for (ListPixelType::const_iterator it = L.begin(); it != L.end(); ++it)
{
UpdateSharedDataOutsideParameters(*it, featureVal, productChange);
}
this->m_SharedData->m_LevelSetDataPointerVector[fId]->m_HeavisideFunctionOfLevelSetImage->SetPixel(inputIndex, newH);
}
} // end namespace itk
#endif
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