itkImagePCAShapeModelEstimator.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImagePCAShapeModelEstimator.h,v $
  Language:  C++
  Date:      $Date: 2009-04-23 03:53:35 $
  Version:   $Revision: 1.8 $

  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 __itkImagePCAShapeModelEstimator_h
#define __itkImagePCAShapeModelEstimator_h

#include <time.h>
#include <math.h>
#include <float.h>

#include "vnl/vnl_vector.h"
#include "vnl/vnl_matrix.h"
#include "vnl/vnl_math.h"
#include "vnl/algo/vnl_matrix_inverse.h"

#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkExceptionObject.h"

#include "itkImageShapeModelEstimatorBase.h"
#include "itkConceptChecking.h"
#include "itkImage.h"
#include <vnl/algo/vnl_generalized_eigensystem.h>
#include <vnl/algo/vnl_symmetric_eigensystem.h>

namespace itk
{

template <class TInputImage, 
          class TOutputImage= Image<double, ::itk::GetImageDimension<TInputImage>::ImageDimension> >
class ITK_EXPORT ImagePCAShapeModelEstimator: 
    public ImageShapeModelEstimatorBase<TInputImage, TOutputImage>
{
public:
  typedef ImagePCAShapeModelEstimator                             Self;
  typedef ImageShapeModelEstimatorBase<TInputImage, TOutputImage> Superclass;
  typedef SmartPointer<Self>                                      Pointer;
  typedef SmartPointer<const Self>                                ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ImagePCAShapeModelEstimator, ImageShapeModelEstimatorBase);

  typedef TInputImage                           InputImageType;
  typedef typename TInputImage::Pointer         InputImagePointer;
  typedef typename TInputImage::ConstPointer    InputImageConstPointer;

  typedef typename TInputImage::PixelType   InputImagePixelType;

  typedef ImageRegionIterator<TInputImage>      InputImageIterator;
  typedef ImageRegionConstIterator<TInputImage> InputImageConstIterator;

  itkStaticConstMacro(InputImageDimension, unsigned int,
                      TInputImage::ImageDimension); 

  typedef TOutputImage                    OutputImageType;
  typedef typename TOutputImage::Pointer  OutputImagePointer;

  typedef ImageRegionIterator<TOutputImage> OutputImageIterator;

  typedef vnl_matrix<double> MatrixOfDoubleType; 

  typedef vnl_matrix<int>    MatrixOfIntegerType;

  typedef vnl_vector<double> VectorOfDoubleType;

  virtual void SetNumberOfPrincipalComponentsRequired( unsigned int n );
  itkGetConstMacro( NumberOfPrincipalComponentsRequired, unsigned int );

  virtual void SetNumberOfTrainingImages( unsigned int n );
  itkGetConstMacro(NumberOfTrainingImages, unsigned int);

  itkGetConstMacro(EigenValues, VectorOfDoubleType);  

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

  virtual void EnlargeOutputRequestedRegion( DataObject * );

  virtual void GenerateInputRequestedRegion();

  void GenerateData();

private:

  ImagePCAShapeModelEstimator(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  typedef std::vector<InputImageConstPointer>    InputImagePointerArray;
  typedef std::vector< InputImageConstIterator > InputImageIteratorArray;

  typedef typename TInputImage::SizeType ImageSizeType;

  typedef typename TInputImage::PixelType InputPixelType;

  virtual void EstimateShapeModels();

  void EstimatePCAShapeModelParameters();

  void CalculateInnerProduct();

  InputImageIteratorArray m_InputImageIteratorArray;

  VectorOfDoubleType    m_Means; 

  MatrixOfDoubleType    m_InnerProduct;

  MatrixOfDoubleType    m_EigenVectors;

  VectorOfDoubleType    m_EigenValues;

  VectorOfDoubleType    m_EigenVectorNormalizedEnergy;

  ImageSizeType         m_InputImageSize;

  unsigned int          m_NumberOfPixels;

  // The number of input images for PCA
  unsigned int          m_NumberOfTrainingImages;

  // The number of output Pricipal Components
  unsigned int          m_NumberOfPrincipalComponentsRequired;
  
}; // class ImagePCAShapeModelEstimator


} // namespace itk

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

#endif

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