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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 itkRegionBasedLevelSetFunctionData_h
#define itkRegionBasedLevelSetFunctionData_h
#include "itkLightObject.h"
#include "itkVector.h"
#include "itkListSample.h"
#include "itkKdTreeGenerator.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionIteratorWithIndex.h"
namespace itk
{
/** \class RegionBasedLevelSetFunctionData
*
* \brief Helper class used to share data in the ScalarChanAndVeseLevelSetFunction.
*
* This class holds cache data used during the computation of the LevelSet updates.
*
* Based on the paper:
*
* "An active contour model without edges"
* T. Chan and L. Vese.
* In Scale-Space Theories in Computer Vision, pages 141-151, 1999.
*
* \author Mosaliganti K., Smith B., Gelas A., Gouaillard A., Megason S.
*
* This code was taken from the Insight Journal paper:
*
* "Cell Tracking using Coupled Active Surfaces for Nuclei and Membranes"
* https://www.insight-journal.org/browse/publication/642
*
* That is based on the papers:
*
* "Level Set Segmentation: Active Contours without edge"
* https://www.insight-journal.org/browse/publication/322
*
* and
*
* "Level set segmentation using coupled active surfaces"
* https://www.insight-journal.org/browse/publication/323
*
*
* \ingroup ITKReview
*/
template <typename TInputImage, typename TFeatureImage>
class ITK_TEMPLATE_EXPORT RegionBasedLevelSetFunctionData : public LightObject
{
public:
ITK_DISALLOW_COPY_AND_MOVE(RegionBasedLevelSetFunctionData);
using Self = RegionBasedLevelSetFunctionData;
using Superclass = LightObject;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
static constexpr unsigned int ImageDimension = TFeatureImage::ImageDimension;
/** Method for creation through the object factory. */
itkNewMacro(Self);
itkOverrideGetNameOfClassMacro(RegionBasedLevelSetFunctionData);
using InputImageType = TInputImage;
using InputImagePointer = typename InputImageType::Pointer;
using InputImageConstPointer = typename InputImageType::ConstPointer;
using InputPixelType = typename InputImageType::PixelType;
using InputRegionType = typename InputImageType::RegionType;
using InputSizeType = typename InputImageType::SizeType;
using InputSizeValueType = typename InputSizeType::SizeValueType;
using InputSpacingType = typename InputImageType::SpacingType;
using InputIndexType = typename InputImageType::IndexType;
using InputIndexValueType = typename InputIndexType::IndexValueType;
using InputPointType = typename InputImageType::PointType;
using FeatureImageType = TFeatureImage;
using FeatureImagePointer = typename FeatureImageType::Pointer;
using FeatureImageConstPointer = typename FeatureImageType::ConstPointer;
using FeaturePixelType = typename FeatureImageType::PixelType;
using FeatureRegionType = typename FeatureImageType::RegionType;
using FeatureSizeType = typename FeatureImageType::SizeType;
using FeatureSizeValueType = typename FeatureSizeType::SizeValueType;
using FeatureSpacingType = typename FeatureImageType::SpacingType;
using FeatureIndexType = typename FeatureImageType::IndexType;
using FeaturePointType = typename FeatureImageType::PointType;
// Allocates m_HeavisideFunctionOfLevelSetImage to have same origin,
// spacing and size as image. Also sets the m_Start and m_End indices.
void
CreateHeavisideFunctionOfLevelSetImage(const InputImageType * image);
// Checks if the given index lies in the domain of the current
// level-set function. The domain is defined by the start and end indices.
template <typename TIndex>
bool
VerifyInsideRegion(const TIndex & featureIndex)
{
for (unsigned int j = 0; j < ImageDimension; ++j)
{
if ((featureIndex[j] < static_cast<InputIndexValueType>(this->m_Start[j])) ||
(featureIndex[j] > static_cast<InputIndexValueType>(this->m_End[j])))
{
return false;
}
}
return true;
}
// Get the index into the domain of the current level-set function
InputIndexType
GetIndex(const FeatureIndexType & featureIndex);
// Get the index in the domain of the feature image
FeatureIndexType
GetFeatureIndex(const InputIndexType & inputIndex);
double m_WeightedNumberOfPixelsInsideLevelSet{};
double m_WeightedNumberOfPixelsOutsideLevelSet{};
InputImagePointer m_HeavisideFunctionOfLevelSetImage{};
InputIndexType m_Start{};
InputIndexType m_End{};
protected:
RegionBasedLevelSetFunctionData();
~RegionBasedLevelSetFunctionData() override = default;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkRegionBasedLevelSetFunctionData.hxx"
#endif
#endif
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