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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 itkNeighborhoodInnerProduct_hxx
#define itkNeighborhoodInnerProduct_hxx
#include "itkNumericTraits.h"
namespace itk
{
template <typename TImage, typename TOperator, typename TComputation>
auto
NeighborhoodInnerProduct<TImage, TOperator, TComputation>::Compute(const ConstNeighborhoodIterator<TImage> & it,
const OperatorType & op,
const unsigned int start,
const unsigned int stride) -> OutputPixelType
{
using InputPixelType = typename TImage::PixelType;
using InputPixelRealType = typename NumericTraits<InputPixelType>::RealType;
using AccumulateRealType = typename NumericTraits<InputPixelRealType>::AccumulateType;
using OutputPixelValueType = typename NumericTraits<OutputPixelType>::ValueType;
const typename OperatorType::ConstIterator op_end = op.End();
typename OperatorType::ConstIterator o_it = op.Begin();
AccumulateRealType sum{};
for (unsigned int i = start; o_it < op_end; i += stride, ++o_it)
{
sum += static_cast<AccumulateRealType>(static_cast<OutputPixelValueType>(*o_it) *
static_cast<InputPixelRealType>(it.GetPixel(i)));
}
return static_cast<OutputPixelType>(sum);
}
template <typename TImage, typename TOperator, typename TComputation>
auto
NeighborhoodInnerProduct<TImage, TOperator, TComputation>::Compute(
/* const ImageBoundaryCondition<TImage> *,*/
const NeighborhoodType & N,
const OperatorType & op,
const unsigned int start,
const unsigned int stride) -> OutputPixelType
{
typename OperatorType::ConstIterator o_it;
using InputPixelType = typename TImage::PixelType;
using InputPixelRealType = typename NumericTraits<InputPixelType>::RealType;
using AccumulateRealType = typename NumericTraits<InputPixelRealType>::AccumulateType;
AccumulateRealType sum{};
using OutputPixelValueType = typename NumericTraits<OutputPixelType>::ValueType;
o_it = op.Begin();
const typename OperatorType::ConstIterator op_end = op.End();
for (unsigned int i = start; o_it < op_end; i += stride, ++o_it)
{
sum +=
static_cast<AccumulateRealType>(static_cast<OutputPixelValueType>(*o_it) * static_cast<InputPixelRealType>(N[i]));
}
return static_cast<OutputPixelType>(sum);
}
} // end namespace itk
#endif
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