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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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.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 itkLabelContourImageFilter_h
#define itkLabelContourImageFilter_h
#include "itkInPlaceImageFilter.h"
#include "itkImage.h"
#include "itkConceptChecking.h"
#include <vector>
#include "itkBarrier.h"
namespace itk
{
/**
* \class LabelContourImageFilter
* \brief Labels the pixels on the border of the objects in a labeled image.
*
* LabelContourImageFilter takes a labeled image as input, where the pixels in the
* objects are the pixels with a value different of the BackgroundValue. Only the pixels
* on the contours of the objects are kept. The pixels not on the border are changed
* to BackgroundValue. The labels of the object are the same in the input and in the
* output image.
*
* The connectivity can be changed to minimum or maximum connectivity with
* SetFullyConnected(). Full connectivity produces thicker contours.
*
* https://hdl.handle.net/1926/1352
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
*
* \sa BinaryContourImageFilter
*
* \ingroup ITKImageLabel
*
* \wiki
* \wikiexample{ImageSegmentation/LabelContourImageFilter,Label the contours of connected components}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT LabelContourImageFilter:
public InPlaceImageFilter< TInputImage, TOutputImage >
{
public:
/**
* Standard "Self" & Superclass typedef.
*/
typedef LabelContourImageFilter Self;
typedef InPlaceImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/**
* Method for creation through the object factory.
*/
itkNewMacro(Self);
/**
* Run-time type information (and related methods)
*/
itkTypeMacro(LabelContourImageFilter, InPlaceImageFilter);
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
#ifdef ITK_USE_CONCEPT_CHECKING
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension);
itkConceptMacro( SameDimension,
( Concept::SameDimension< itkGetStaticConstMacro(InputImageDimension),
itkGetStaticConstMacro(OutputImageDimension) > ) );
#endif
/**
* Image typedef support
*/
typedef TInputImage InputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
typedef typename InputImageType::IndexType InputIndexType;
typedef typename InputImageType::SizeType InputSizeType;
typedef typename InputImageType::OffsetType InputOffsetType;
typedef typename InputImageType::PixelType InputImagePixelType;
typedef typename InputImageType::SizeValueType SizeValueType;
typedef typename InputImageType::OffsetValueType OffsetValueType;
typedef typename InputImageType::PixelType InputPixelType;
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::Pointer OutputImagePointer;
typedef typename OutputImageType::RegionType OutputRegionType;
typedef typename OutputImageType::IndexType OutputIndexType;
typedef typename OutputImageType::SizeType OutputSizeType;
typedef typename OutputImageType::OffsetType OutputOffsetType;
typedef typename OutputImageType::PixelType OutputImagePixelType;
/**
* Set/Get whether the connected components are defined strictly by
* face connectivity or by face+edge+vertex connectivity. Default is
* FullyConnectedOff.
* \note For objects that are 1 pixel wide, use FullyConnectedOn.
*/
itkSetMacro(FullyConnected, bool);
itkGetConstReferenceMacro(FullyConnected, bool);
itkBooleanMacro(FullyConnected);
/**
* Set/Get the background value used to identify the objects and mark the
* pixels not on the border of the objects.
*/
itkSetMacro(BackgroundValue, OutputImagePixelType);
itkGetConstMacro(BackgroundValue, OutputImagePixelType);
protected:
LabelContourImageFilter();
virtual ~LabelContourImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/**
* Standard pipeline methods.
*/
void BeforeThreadedGenerateData() ITK_OVERRIDE;
void AfterThreadedGenerateData() ITK_OVERRIDE;
void ThreadedGenerateData(const OutputRegionType & outputRegionForThread,
ThreadIdType threadId) ITK_OVERRIDE;
/** LabelContourImageFilter needs the entire input. Therefore
* it must provide an implementation GenerateInputRequestedRegion().
* \sa ProcessObject::GenerateInputRequestedRegion(). */
void GenerateInputRequestedRegion() ITK_OVERRIDE;
/** LabelContourImageFilter will produce all of the output.
* Therefore it must provide an implementation of
* EnlargeOutputRequestedRegion().
* \sa ProcessObject::EnlargeOutputRequestedRegion() */
void EnlargeOutputRequestedRegion( DataObject * itkNotUsed(output) ) ITK_OVERRIDE;
private:
LabelContourImageFilter(const Self &);
void operator = ( const Self& );
/** types to support the run length encoding of lines */
struct RunLength
{
/** run length information - may be a more type safe way of doing this */
SizeValueType length;
/** Index of the start of the run */
InputIndexType where;
InputImagePixelType label;
};
typedef std::vector< RunLength > LineEncodingType;
typedef typename LineEncodingType::iterator LineEncodingIterator;
typedef typename LineEncodingType::const_iterator LineEncodingConstIterator;
typedef std::vector< OffsetValueType > OffsetVectorType;
typedef typename OffsetVectorType::const_iterator OffsetVectorConstIterator;
// the map storing lines
typedef std::vector< LineEncodingType > LineMapType;
LineMapType m_LineMap;
OutputImagePixelType m_BackgroundValue;
ThreadIdType m_NumberOfThreads;
bool m_FullyConnected;
bool CheckNeighbors(const OutputIndexType & A,
const OutputIndexType & B) const;
void CompareLines(TOutputImage *output, LineEncodingType & current, const LineEncodingType & Neighbour);
void SetupLineOffsets(OffsetVectorType & LineOffsets);
void Wait();
typename Barrier::Pointer m_Barrier;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLabelContourImageFilter.hxx"
#endif
#endif
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