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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 itkInterpolateImageFilter_h
#define itkInterpolateImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkLinearInterpolateImageFunction.h"
namespace itk
{
/**
* \class InterpolateImageFilter
* \brief Interpolate an image from two N-D images.
*
* Interpolates an image from two input images of the same type
* and same dimension (N). In particular, this filter forms an intermediate
* (N+1)D image by concatenating the two input images and interpolating
* an image a distance \f$ d \in [0,1] \f$ away from the first image.
*
* The interpolation is delegated to a user specified InterpolateImageFunction.
* By default, linear interpolation is used.
*
* The filter is templated over the input image type and output image type.
* It assumes that the input and output have the same number of dimensions.
*
* \ingroup MultiThreaded
* \ingroup ITKImageGrid
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT InterpolateImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(InterpolateImageFilter);
/** Standard class type aliases. */
using Self = InterpolateImageFilter;
using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(InterpolateImageFilter);
/** Inherit type alias from Superclass */
using typename Superclass::InputImageType;
using typename Superclass::InputImagePointer;
using typename Superclass::OutputImageType;
using typename Superclass::OutputImagePointer;
using typename Superclass::OutputImageRegionType;
/** Number of dimensions. */
static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
static constexpr unsigned int IntermediateImageDimension = TOutputImage::ImageDimension + 1;
/** Interpolator type alias. */
using InputPixelType = typename TInputImage::PixelType;
using IntermediateImageType = Image<InputPixelType, Self::IntermediateImageDimension>;
using InterpolatorType = InterpolateImageFunction<IntermediateImageType>;
/** Set/Get the first image */
void
SetInput1(const InputImageType * image)
{
this->SetInput(image);
}
const InputImageType *
GetInput1()
{
return this->GetInput();
}
/** Set/Get the second image */
void
SetInput2(const InputImageType * image);
const InputImageType *
GetInput2();
/** Set/Get the distance from the first image from which to generate
* interpolated image. The default value is 0.5 */
itkSetClampMacro(Distance, double, 0.0, 1.0);
itkGetConstMacro(Distance, double);
/** Get/Set the interpolator function */
itkSetObjectMacro(Interpolator, InterpolatorType);
itkGetModifiableObjectMacro(Interpolator, InterpolatorType);
/**
* Set up the state of the filter before multi-threading.
* InterpolatorType::SetInputImage is not thread-safe and hence
* has to be setup before ThreadedGenerateData.
*/
void
BeforeThreadedGenerateData() override;
/** This method is used to run after multi-threading. */
void
AfterThreadedGenerateData() override;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputPixelType>));
// End concept checking
#endif
protected:
InterpolateImageFilter();
~InterpolateImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** InterpolateImageFilter can be implemented as a multithreaded filter. */
void
DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
private:
typename InterpolatorType::Pointer m_Interpolator{};
typename IntermediateImageType::Pointer m_IntermediateImage{};
double m_Distance{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkInterpolateImageFilter.hxx"
#endif
#endif
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