itkRecursiveGaussianImageFilter.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 __itkRecursiveGaussianImageFilter_h
#define __itkRecursiveGaussianImageFilter_h

#include "itkRecursiveSeparableImageFilter.h"

namespace itk
{
template< typename TInputImage, typename TOutputImage = TInputImage >
class ITK_EXPORT RecursiveGaussianImageFilter:
  public RecursiveSeparableImageFilter< TInputImage, TOutputImage >
{
public:
  typedef RecursiveGaussianImageFilter                               Self;
  typedef RecursiveSeparableImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                                       Pointer;
  typedef SmartPointer< const Self >                                 ConstPointer;

  typedef typename Superclass::RealType       RealType;
  typedef typename Superclass::ScalarRealType ScalarRealType;

  itkNewMacro(Self);

  itkTypeMacro(RecursiveGaussianImageFilter, RecursiveSeparableImageFilter);

  itkGetConstMacro(Sigma, ScalarRealType);
  itkSetMacro(Sigma, ScalarRealType);

  typedef  enum { ZeroOrder, FirstOrder, SecondOrder } OrderEnumType;

  typedef TOutputImage OutputImageType;

  itkSetMacro(NormalizeAcrossScale, bool);
  itkGetConstMacro(NormalizeAcrossScale, bool);

  itkSetMacro(Order, OrderEnumType);
  itkGetConstMacro(Order, OrderEnumType);

  void SetZeroOrder();

  void SetFirstOrder();

  void SetSecondOrder();

protected:
  RecursiveGaussianImageFilter();
  virtual ~RecursiveGaussianImageFilter() {}
  void PrintSelf(std::ostream & os, Indent indent) const;

  virtual void SetUp(ScalarRealType spacing);

  /* See superclass for doxygen. This method adds the additional check
   * that sigma is greater than zero. */
  virtual void VerifyPreconditions();

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

  void ComputeNCoefficients(ScalarRealType sigmad,
                            ScalarRealType A1, ScalarRealType B1, ScalarRealType W1, ScalarRealType L1,
                            ScalarRealType A2, ScalarRealType B2, ScalarRealType W2, ScalarRealType L2,
                            ScalarRealType & N0, ScalarRealType & N1,
                            ScalarRealType & N2, ScalarRealType & N3,
                            ScalarRealType & SN, ScalarRealType & DN, ScalarRealType & EN);

  void ComputeDCoefficients(ScalarRealType sigmad,
                            ScalarRealType W1, ScalarRealType L1, ScalarRealType W2, ScalarRealType L2,
                            ScalarRealType & SD, ScalarRealType & DD, ScalarRealType & ED);

  void ComputeRemainingCoefficients(bool symmetric);

  ScalarRealType m_Sigma;

  bool m_NormalizeAcrossScale;

  OrderEnumType m_Order;
};
} // end namespace itk

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

#endif