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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 itkPhysicsBasedNonRigidRegistrationMethod_h
#define itkPhysicsBasedNonRigidRegistrationMethod_h
#include "itkMaskFeaturePointSelectionFilter.h"
#include "itkBlockMatchingImageFilter.h"
#include "itkFEMScatteredDataPointSetToImageFilter.h"
#include "itkConceptChecking.h"
namespace itk
{
namespace fem
{
/** \class PhysicsBasedNonRigidRegistrationMethod
* \brief Perform a non-rigid registration of two 3D images using a set of
* feature points, block matching and linear elastic model.
*
* PhysicsBasedNonRigidRegistrationMethod takes a fixed image, a moving
* image with an optional mask and a mesh as inputs and generates a
* dense deformation field image as an output.
*
* This filter is intended to be used for driving the process of Physics-
* Based Non-Rigid Registration. It computes feature points from the
* moving image, then computes displacements of the feature points in the
* fixed image via block-matching, then computes deformation field of a
* whole image using linear elastic model[ M. Bierling, Displacement
* estimation by hierarchical block matching, Proc. SPIE Vis. Comm. and
* Image Proc., vol. 1001, pp. 942-951, 1988. ].
*
* The filter is templated over fixed image, moving image, mask, mesh and
* deformation field image.
*
* \author Andriy Kot, Center for Real-Time Computing, Old Dominion University,
* Norfolk, VA
*
* \ingroup ITKFEMRegistration
*/
template <typename TFixedImage, typename TMovingImage, typename TMaskImage, typename TMesh, typename TDeformationField>
class ITK_TEMPLATE_EXPORT PhysicsBasedNonRigidRegistrationMethod
: public ImageToImageFilter<TMovingImage, TDeformationField>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(PhysicsBasedNonRigidRegistrationMethod);
using Self = PhysicsBasedNonRigidRegistrationMethod;
using Superclass = ImageToImageFilter<TMovingImage, TDeformationField>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(PhysicsBasedNonRigidRegistrationMethod);
using MovingImageType = TMovingImage;
using FixedImageType = TFixedImage;
using MaskImageType = TMaskImage;
using MeshType = TMesh;
using DeformationFieldType = TDeformationField;
static constexpr unsigned int ImageDimension = FixedImageType::ImageDimension;
/** Not input specific type alias */
using ImageRegionType = ImageRegion<ImageDimension>;
using ImageSizeType = Size<ImageDimension>;
using ImageIndexType = Index<ImageDimension>;
/** Typedefs for the components filters. */
using FeatureSelectionFilterType = MaskFeaturePointSelectionFilter<MovingImageType, MaskImageType>;
using BlockMatchingFilterType = BlockMatchingImageFilter<FixedImageType, MovingImageType>;
using FEMFilterType = FEMScatteredDataPointSetToImageFilter<
typename BlockMatchingFilterType::DisplacementsType,
MeshType,
DeformationFieldType,
typename BlockMatchingFilterType::SimilaritiesType,
typename FeatureSelectionFilterType::FeaturePointsType>; // tensors are optional pixel values of feature points
// pointset
/** set fraction of eligible points to select */
itkSetMacro(SelectFraction, double);
itkGetConstMacro(SelectFraction, double);
/** set/get non-connectivity */
itkSetMacro(NonConnectivity, unsigned int);
itkGetConstMacro(NonConnectivity, unsigned int);
/** set/get half size */
itkSetMacro(BlockRadius, ImageSizeType);
itkGetConstReferenceMacro(BlockRadius, ImageSizeType);
/** set/get half window */
itkSetMacro(SearchRadius, ImageSizeType);
itkGetConstReferenceMacro(SearchRadius, ImageSizeType);
/** set/get number of approximation steps */
itkSetMacro(ApproximationSteps, unsigned int);
itkGetMacro(ApproximationSteps, unsigned int);
/** set/get number of outlier rejection steps */
itkSetMacro(OutlierRejectionSteps, unsigned int);
itkGetMacro(OutlierRejectionSteps, unsigned int);
/** set/get fixed image */
itkSetInputMacro(FixedImage, FixedImageType);
itkGetInputMacro(FixedImage, FixedImageType);
/** set/get moving image */
itkSetInputMacro(MovingImage, MovingImageType);
itkGetInputMacro(MovingImage, MovingImageType);
/** set/get moving image */
itkSetInputMacro(MaskImage, MaskImageType);
itkGetInputMacro(MaskImage, MaskImageType);
/** set/get moving image */
itkSetInputMacro(Mesh, MeshType);
itkGetInputMacro(Mesh, MeshType);
/** get FEMFilter */
itkGetConstObjectMacro(FEMFilter, FEMFilterType);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
/* Currently only the 3D implementation is available due to a narrow
definition of the filter in the original proposal
and lack of available resources. */
itkConceptMacro(FixedImageDimensionShouldBe3, (Concept::SameDimension<TFixedImage::ImageDimension, 3u>));
itkConceptMacro(MovingImageDimensionShouldBe3, (Concept::SameDimension<TMovingImage::ImageDimension, 3u>));
itkConceptMacro(MaskImageDimensionShouldBe3, (Concept::SameDimension<TMaskImage::ImageDimension, 3u>));
itkConceptMacro(MeshDimensionShouldBe3, (Concept::SameDimension<TMesh::PointType::PointDimension, 3u>));
itkConceptMacro(DeformationFieldImageDimensionShouldBe3,
(Concept::SameDimension<TDeformationField::ImageDimension, 3u>));
// End concept checking
#endif
protected:
PhysicsBasedNonRigidRegistrationMethod();
~PhysicsBasedNonRigidRegistrationMethod() override;
void
PrintSelf(std::ostream & os, Indent indent) const override;
void
GenerateData() override;
private:
double m_SelectFraction{ 0.1 };
unsigned int m_NonConnectivity{ 0 };
ImageSizeType m_BlockRadius{};
ImageSizeType m_SearchRadius{};
unsigned int m_ApproximationSteps{ 10 };
unsigned int m_OutlierRejectionSteps{ 10 };
typename FeatureSelectionFilterType::Pointer m_FeatureSelectionFilter{};
typename BlockMatchingFilterType::Pointer m_BlockMatchingFilter{};
typename FEMFilterType::Pointer m_FEMFilter{};
};
} // end namespace fem
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkPhysicsBasedNonRigidRegistrationMethod.hxx"
#endif
#endif
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