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/*
* Copyright (C) 1999-2011 Insight Software Consortium
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 otbLabelToBoundaryImageFilter_h
#define otbLabelToBoundaryImageFilter_h
#include "otbUnaryFunctorNeighborhoodImageFilter.h"
namespace otb
{
namespace Functor
{
/**
* \class LabelToBoundaryFunctor
*
* \brief Functor to extract segmentation boundaries
*
* Functor intended to work with 3x3 neighborhood and scalar label image
* The generated boundary is 1-pixel wide, so it is not symmetric.
* Output value is 1 on the boundaries and 0 in the background
*
* \ingroup OTBLabelling
*/
template <class TInput, class TOutput>
class LabelToBoundaryFunctor
{
public:
LabelToBoundaryFunctor()
{
}
virtual ~LabelToBoundaryFunctor()
{
}
TOutput operator()(const TInput& input)
{
unsigned char output = 1;
if (input.GetCenterPixel() == input.GetPixel(5) && input.GetCenterPixel() == input.GetPixel(7) && input.GetCenterPixel() == input.GetPixel(8))
{
output = 0;
}
return static_cast<TOutput>(output);
}
}; // end of class
} // end of Functor namespace
/**
* \class LabelToBoundaryImageFilter
*
* \brief Filter to extract boundaries of a label image
*
* Filter intended to work with a scalar label image.
* The generated boundary is 1-pixel wide, so it is not symmetric.
* Output value is 1 on the boundaries and 0 in the background
*
* \ingroup OTBLabelling
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT LabelToBoundaryImageFilter
: public UnaryFunctorNeighborhoodImageFilter<
TInputImage, TOutputImage, Functor::LabelToBoundaryFunctor<typename itk::ConstNeighborhoodIterator<TInputImage>, typename TOutputImage::PixelType>>
{
public:
typedef LabelToBoundaryImageFilter Self;
typedef UnaryFunctorNeighborhoodImageFilter<
TInputImage, TOutputImage, Functor::LabelToBoundaryFunctor<typename itk::ConstNeighborhoodIterator<TInputImage>, typename TOutputImage::PixelType>>
Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
itkNewMacro(Self);
itkTypeMacro(LabelToBoundaryImageFilter, UnaryFunctorNeighborhoodImageFilter);
protected:
LabelToBoundaryImageFilter()
{
this->SetRadius(1);
}
~LabelToBoundaryImageFilter() override
{
}
private:
LabelToBoundaryImageFilter(const Self&); // Not implemented
void operator=(const Self&); // Not implemented
}; // end of class
} // end of otb namespace
#endif
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