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/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef otbImageToEdgePathFilter_h
#define otbImageToEdgePathFilter_h
#include "otbImageToPathFilter.h"
namespace otb
{
/**
* \class ImageToEdgePathFilter
* \brief This filter compute the closed edge path of a labelled object
* in an image (for example coming from a segmentation filter). Its output
* is a Path.
*
* The input image is first surrounded by a 1 pixel wide border-line using the
* ConstantPadImageFilter in order to deal with stuck-to-the-border
* objects. The padding constant is chosen as regard to the ForegroundValue (label of
* the object) to avoid confusion on foreground and background values.
*
* The edge computation is divided into two steps.
*
* First, a linear search is performed to detect a first pixel belonging to the edge of
* the object.
*
* From that pixel and until the algorithm comes back to this position, the neighborhood
* is iteratively and clock-wise searched to detect the next pixel in the edge.
*
* In case of linear object (in fact open edge), the algorithm will walk the object twice in
* opposite directions, thus producing an edge with a null surface and twice the length of the
* object as perimeter.
*
* This leads to consistent result for geometric descriptors (for instance compacity).
* \sa ImageToPathFilter
*
* \ingroup OTBPath
*/
template <class TInputImage, class TOutputPath>
class ITK_EXPORT ImageToEdgePathFilter
: public ImageToPathFilter<TInputImage, TOutputPath>
{
public:
/** standards typedefs */
typedef ImageToEdgePathFilter Self;
typedef ImageToPathFilter<TInputImage, TOutputPath> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/// Creation through the object factory
itkNewMacro(Self);
/// Runtime information
itkTypeMacro(ImageToEdgePathFilter, ImageToPathFilter);
/// Template parameters typedef
typedef typename Superclass::InputImageType InputImageType;
typedef typename Superclass::InputImagePointerType InputImagePointerType;
typedef typename Superclass::OutputPathType OutputPathType;
typedef typename Superclass::OutputPathPointerType OutputPathPointerType;
typedef typename OutputPathType::ContinuousIndexType ContinuousIndexType;
typedef typename InputImageType::PixelType PixelType;
typedef typename InputImageType::SizeType SizeType;
/** Set and Get foreground value */
itkSetMacro(ForegroundValue, PixelType);
itkGetConstMacro(ForegroundValue, PixelType);
protected:
ImageToEdgePathFilter();
~ImageToEdgePathFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream& os, itk::Indent indent) const ITK_OVERRIDE;
void GenerateOutputInformation() ITK_OVERRIDE {} //does nothing
void GenerateData() ITK_OVERRIDE;
private:
ImageToEdgePathFilter(const Self &); // purposely not implemented
void operator =(const Self&); // purposely not implemented
PixelType m_ForegroundValue;
};
} // end namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbImageToEdgePathFilter.txx"
#endif
#endif
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