NICE_VisLearning/math/ftransform/PCA.h

/** 
 * @file PCA.h
 * @brief extract fourier domain value
 * @author Michael Koch
 * @date 5/27/2008

 */
#ifndef PCAINCLUDE
#define PCAINCLUDE

#include "vislearning/math/ftransform/FTransform.h"


namespace OBJREC {

/** extract PCA features */
class PCA: public FTransform
{

     protected:
          NICE::Vector mean;

          NICE::Matrix basis;
		      NICE::Matrix normbasis;
		  
          NICE::Matrix normalization;
          uint targetDimension; 
          uint maxiteration;
          double mindelta; 

          void calculateMean ( const NICE::Matrix &features, NICE::Vector & mean );
 
     public:
       
          PCA (uint dim,uint maxiteration=100,double mindelta=1e-4);
          PCA (void);

          NICE::Matrix getBasis();
     
          NICE::Vector getMean();       
          void restore (std::istream & is, int format = 0);
          void store (std::ostream & os, int format = 0) const;
          void clear ();
          
          /**
           * get Basis Vectors of PCA
           * @param features Input Features
           * @param dimension Dimension size / number of principal components 
          * @return Basis Vectors 
          */
          void calculateBasis(const NICE::Matrix &features,const uint targetDimension);
          void calculateBasis(const NICE::Matrix &features,const uint targetDimension,const bool adaptive,const double targetRatio=1.0);
		  
		  /**
		   * returns the dimension of the transformed features
		   * @return feature dim
		   */
		  int getTargetDim();
          
          /**
           * get Features in PCA Space
           * @param data input data
           * @param normalize normalisation switch
           * @return Features as Vector
           */

          NICE::Vector getFeatureVector(const NICE::Vector &data,const bool normalize=true);
          
       
          
          ~PCA();

   private:
 
          void init (uint dim=10,uint maxiteration=100,double mindelta=1e-4);
        
};


} // namespace

#endif