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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 itkBinaryThresholdImageFunction_h
#define itkBinaryThresholdImageFunction_h
#include "itkImageFunction.h"
namespace itk
{
/**
* \class BinaryThresholdImageFunction
* \brief Returns true is the value of an image lies within a range
* of thresholds
* This ImageFunction returns true (or false) if the pixel value lies
* within (outside) a lower and upper threshold value. The threshold
* range can be set with the ThresholdBelow, ThresholdBetween or
* ThresholdAbove methods. The input image is set via method
* SetInputImage().
*
* Methods Evaluate, EvaluateAtIndex and EvaluateAtContinuousIndex
* respectively evaluate the function at an geometric point, image index
* and continuous image index.
*
* \ingroup ImageFunctions
*
* \ingroup ITKImageFunction
*/
template <typename TInputImage, typename TCoordRep = float>
class ITK_TEMPLATE_EXPORT BinaryThresholdImageFunction : public ImageFunction<TInputImage, bool, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(BinaryThresholdImageFunction);
/** Standard class type aliases. */
using Self = BinaryThresholdImageFunction;
using Superclass = ImageFunction<TInputImage, bool, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(BinaryThresholdImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** InputImageType type alias support */
using typename Superclass::InputImageType;
/** Typedef to describe the type of pixel. */
using PixelType = typename TInputImage::PixelType;
/** 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;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** BinaryThreshold the image at a point position
*
* Returns true if the image intensity at the specified point position
* satisfies the threshold criteria. The point is assumed to lie within
* the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
bool
Evaluate(const PointType & point) const override
{
IndexType index;
this->ConvertPointToNearestIndex(point, index);
return (this->EvaluateAtIndex(index));
}
/** BinaryThreshold the image at a continuous index position
*
* Returns true if the image intensity at the specified point position
* satisfies the threshold criteria. The point is assumed to lie within
* the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
bool
EvaluateAtContinuousIndex(const ContinuousIndexType & index) const override
{
IndexType nindex;
this->ConvertContinuousIndexToNearestIndex(index, nindex);
return this->EvaluateAtIndex(nindex);
}
/** BinaryThreshold the image at an index position.
*
* Returns true if the image intensity at the specified point position
* satisfies the threshold criteria. The point is assumed to lie within
* the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
bool
EvaluateAtIndex(const IndexType & index) const override
{
PixelType value = this->GetInputImage()->GetPixel(index);
return (m_Lower <= value && value <= m_Upper);
}
/** Get the lower threshold value. */
itkGetConstReferenceMacro(Lower, PixelType);
/** Get the upper threshold value. */
itkGetConstReferenceMacro(Upper, PixelType);
/** Values greater than or equal to the value are inside. */
void
ThresholdAbove(PixelType thresh);
/** Values less than or equal to the value are inside. */
void
ThresholdBelow(PixelType thresh);
/** Values that lie between lower and upper inclusive are inside. */
void
ThresholdBetween(PixelType lower, PixelType upper);
protected:
BinaryThresholdImageFunction();
~BinaryThresholdImageFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
private:
PixelType m_Lower{};
PixelType m_Upper{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkBinaryThresholdImageFunction.hxx"
#endif
#endif
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