itkGradientImageFilter.h

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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 __itkGradientImageFilter_h
#define __itkGradientImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkCovariantVector.h"

namespace itk
{
template< class TInputImage, class TOperatorValueType = float, class TOutputValueType = float >
class ITK_EXPORT GradientImageFilter:
  public ImageToImageFilter< TInputImage,
                             Image< CovariantVector< TOutputValueType,
                                                     ::itk::GetImageDimension< TInputImage >::ImageDimension >,
                                    ::itk::GetImageDimension< TInputImage >::ImageDimension > >
{
public:
  itkStaticConstMacro(InputImageDimension, unsigned int,
                      TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef GradientImageFilter Self;

  typedef TInputImage                      InputImageType;
  typedef typename InputImageType::Pointer InputImagePointer;
  typedef Image< CovariantVector<
                   TOutputValueType, itkGetStaticConstMacro(OutputImageDimension) >,
                 itkGetStaticConstMacro(OutputImageDimension) >
  OutputImageType;
  typedef typename OutputImageType::Pointer OutputImagePointer;

  typedef ImageToImageFilter< InputImageType, OutputImageType > Superclass;
  typedef SmartPointer< Self >                                  Pointer;
  typedef SmartPointer< const Self >                            ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(GradientImageFilter, ImageToImageFilter);

  typedef typename InputImageType::PixelType InputPixelType;
  typedef TOperatorValueType                 OperatorValueType;
  typedef TOutputValueType                   OutputValueType;
  typedef CovariantVector<
    OutputValueType, itkGetStaticConstMacro(OutputImageDimension) >
  OutputPixelType;
  typedef typename OutputImageType::RegionType OutputImageRegionType;

  virtual void GenerateInputRequestedRegion()
  throw( InvalidRequestedRegionError );

  void SetUseImageSpacingOn()
  { this->SetUseImageSpacing(true); }

  void SetUseImageSpacingOff()
  { this->SetUseImageSpacing(false); }

  itkSetMacro(UseImageSpacing, bool);
  itkGetConstMacro(UseImageSpacing, bool);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< InputPixelType, OutputValueType > ) );
  itkConceptMacro( OutputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< OutputValueType > ) );

#endif

  itkSetMacro(UseImageDirection, bool);
  itkGetConstMacro(UseImageDirection, bool);
  itkBooleanMacro(UseImageDirection);
protected:
  GradientImageFilter();
  virtual ~GradientImageFilter();
  void PrintSelf(std::ostream & os, Indent indent) const;

  void ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
                            ThreadIdType threadId);

private:
  GradientImageFilter(const Self &); //purposely not implemented
  void operator=(const Self &);      //purposely not implemented

  bool m_UseImageSpacing;

  // flag to take or not the image direction into account
  // when computing the derivatives.
  bool m_UseImageDirection;
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGradientImageFilter.hxx"
#endif

#endif