itkImageMomentsCalculator.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageMomentsCalculator.h,v $
  Language:  C++
  Date:      $Date: 2003/02/12 18:45:33 $
  Version:   $Revision: 1.33 $

  Copyright (c) 2002 Insight 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 ImageMomentsCalculator
{
public:
  typedef ImageMomentsCalculator<TImage>   Self;

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

  void ComputeMoments( const ImageType * image );

  ScalarType GetTotalMass();

  VectorType GetFirstMoments();

  MatrixType GetSecondMoments();

  VectorType GetCenterOfGravity();

  MatrixType GetCentralMoments();

  VectorType GetPrincipalMoments();

  MatrixType GetPrincipalAxes();

  AffineTransformPointer GetPrincipalAxesToPhysicalAxesTransform(void) const;

  AffineTransformPointer GetPhysicalAxesToPrincipalAxesTransform(void) const;

  ImageMomentsCalculator();            // Create w/o summing moments

  ImageMomentsCalculator( const ImageType * image); // Create and sum image moments

  ~ImageMomentsCalculator();

private:
  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)

};  // class ImageMomentsCalculator

} // end namespace itk


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

#endif /* __itkImageMomentsCalculator_h */

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