itkImageMomentsCalculator.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageMomentsCalculator.h,v $
  Language:  C++
  Date:      $Date: 2004/04/25 23:59:26 $
  Version:   $Revision: 1.37 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm 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 __itkImageMomentsCalculator_h
#define __itkImageMomentsCalculator_h

#include "itkAffineTransform.h"
#include "itkMacro.h"
#include "itkImage.h"

#include "vnl/vnl_vector_fixed.h"
#include "vnl/vnl_matrix_fixed.h"
#include "vnl/vnl_diag_matrix.h"

namespace itk
{

template < class TImage >
class ITK_EXPORT ImageMomentsCalculator : public Object
{
public:
  typedef ImageMomentsCalculator<TImage>   Self;
  typedef Object Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self> ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ImageMomentsCalculator, Object);

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TImage::ImageDimension);

  typedef double                       ScalarType;

  typedef Vector<ScalarType,itkGetStaticConstMacro(ImageDimension)> VectorType;

  typedef Matrix<ScalarType,
                 itkGetStaticConstMacro(ImageDimension),
                 itkGetStaticConstMacro(ImageDimension)>   MatrixType;

  typedef TImage ImageType;

  typedef typename ImageType::Pointer ImagePointer;
  typedef typename ImageType::ConstPointer ImageConstPointer;

  typedef AffineTransform<double,itkGetStaticConstMacro(ImageDimension)> AffineTransformType;
  typedef typename AffineTransformType::Pointer      AffineTransformPointer;

  virtual void SetImage( const ImageType * image )
    {
    if ( m_Image != image )
      {
      m_Image = image;
      this->Modified();
      m_Valid = false;
      }
    }

  void Compute( void );

  ScalarType GetTotalMass() const;

  VectorType GetFirstMoments() const;

  MatrixType GetSecondMoments() const;

  VectorType GetCenterOfGravity() const;

  MatrixType GetCentralMoments() const;

  VectorType GetPrincipalMoments() const;

  MatrixType GetPrincipalAxes() const;

  AffineTransformPointer GetPrincipalAxesToPhysicalAxesTransform(void) const;

  AffineTransformPointer GetPhysicalAxesToPrincipalAxesTransform(void) const;

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

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

  bool m_Valid;                      // Have moments been computed yet?
  ScalarType m_M0;                   // Zeroth moment
  VectorType m_M1;                   // First moments about origin
  MatrixType m_M2;                   // Second moments about origin
  VectorType m_Cg;                   // Center of gravity (physical units)
  MatrixType m_Cm;                   // Second central moments (physical)
  VectorType m_Pm;                   // Principal moments (physical)
  MatrixType m_Pa;                   // Principal axes (physical)

  ImageConstPointer m_Image;

};  // class ImageMomentsCalculator

} // end namespace itk


#ifndef ITK_MANUAL_INSTANTIATION
#include "itkImageMomentsCalculator.txx"
#endif

#endif /* __itkImageMomentsCalculator_h */

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