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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 itkInterpolateImageFunction_h
#define itkInterpolateImageFunction_h
#include "itkImageFunction.h"
namespace itk
{
/**
* \class InterpolateImageFunction
* \brief Base class for all image interpolators.
*
* InterpolateImageFunction is the base for all ImageFunctions that
* interpolates image intensity at a non-integer pixel position.
* This class is templated over the input image type and the
* coordinate representation type (e.g. float or double ).
*
* \warning This hierarchy of functions work only for images
* with scalar pixel types. For images of vector pixel types
* use VectorInterpolateImageFunctions.
*
* \sa VectorInterpolateImageFunction
* \ingroup ImageFunctions ImageInterpolators
*
*
* \ingroup ITKImageFunction
*/
template <typename TInputImage, typename TCoordRep = double>
class ITK_TEMPLATE_EXPORT InterpolateImageFunction
: public ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(InterpolateImageFunction);
/** Standard class type aliases. */
using Self = InterpolateImageFunction;
using Superclass =
ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(InterpolateImageFunction);
/** OutputType type alias support */
using typename Superclass::OutputType;
/** InputImageType type alias support */
using typename Superclass::InputImageType;
/** Dimension underlying input image. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** Point type alias support */
using typename Superclass::PointType;
/** Index type alias support */
using typename Superclass::IndexType;
using typename Superclass::IndexValueType;
/** Size type alias support */
using SizeType = typename InputImageType::SizeType;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** RealType type alias support */
using RealType = typename NumericTraits<typename TInputImage::PixelType>::RealType;
/** Interpolate the image at a point position
*
* Returns the interpolated image intensity at a
* specified point position. No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
OutputType
Evaluate(const PointType & point) const override
{
const ContinuousIndexType index =
this->GetInputImage()->template TransformPhysicalPointToContinuousIndex<TCoordRep>(point);
return (this->EvaluateAtContinuousIndex(index));
}
/** Interpolate the image at a continuous index position
*
* Returns the interpolated image intensity at a
* specified index position. No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* Subclasses must override this method.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & index) const override = 0;
/** Interpolate the image at an index position.
*
* Simply returns the image value at the
* specified index position. No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
OutputType
EvaluateAtIndex(const IndexType & index) const override
{
return (static_cast<RealType>(this->GetInputImage()->GetPixel(index)));
}
/** Get the radius required for interpolation.
*
* This defines the number of surrounding pixels required to interpolate at
* a given point.
*/
#if defined(ITKV4_COMPATIBILITY)
virtual SizeType
GetRadius() const
{
// if ITKv4 compatibility is enabled then set the radius to the
// largest by default.
const InputImageType * input = this->GetInputImage();
if (!input)
{
itkExceptionMacro("Input image required!");
}
return input->GetLargestPossibleRegion().GetSize();
}
#else
virtual SizeType
GetRadius() const = 0;
#endif
protected:
InterpolateImageFunction() = default;
~InterpolateImageFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override
{
Superclass::PrintSelf(os, indent);
}
};
} // end namespace itk
#endif
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