PatchFeatureEntry.h

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// ****************************************************************************
// This file is part of the Integrating Vision Toolkit (IVT).
//
// The IVT is maintained by the Karlsruhe Institute of Technology (KIT)
// (www.kit.edu) in cooperation with the company Keyetech (www.keyetech.de).
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// ****************************************************************************
// ****************************************************************************
// Filename:  PatchFeatureEntry.h
// Author:    Pedram Azad
// Date:      24.09.2008
// ****************************************************************************


#ifndef _PATCH_FEATURE_ENTRY_H_
#define _PATCH_FEATURE_ENTRY_H_


// ****************************************************************************
// Necessary includes
// ****************************************************************************

#include "Features/FeatureEntry.h"
#include <math.h>



// ****************************************************************************
// CPatchFeatureEntry
// ****************************************************************************

class CPatchFeatureEntry : public CFeatureEntry
{
public:
        // constructor
        CPatchFeatureEntry(const float *pFeature, int nSize, float x, float y, float angle, float scale) : CFeatureEntry(pFeature, nSize, x, y, angle, scale)
        {
        }

        CPatchFeatureEntry() : CFeatureEntry(0, 0.0f, 0.0f, 0.0f, 0.0f, Math3d::zero_vec)
        {
        }

        CPatchFeatureEntry(const CPatchFeatureEntry &featureEntry) : CFeatureEntry(featureEntry)
        {
        }


        // public methods
        bool ExtractFeature(const CByteImage *pImage, int nWindowSize, float x, float y);

        
        // pure virtual methods
        eFeatureType GetType() const
        {
                return tPatch;
        }

        CFeatureEntry* Clone() const
        {
                return new CPatchFeatureEntry(*this);
        }

        float Error(const CDynamicArrayElement *pElement) const
        {
                const CPatchFeatureEntry *pCastedElement = (const CPatchFeatureEntry *) pElement;
                const float *pFeature = pCastedElement->m_pFeature;

                float error = 0.0f;
                for (int i = 0; i < m_nSize; i++)
                        error += (pFeature[i] - m_pFeature[i]) * (pFeature[i] - m_pFeature[i]);
                        
                return error;
        }
        
        // other public methods
        void NormalizeIntensity()
        {
                int i;
                float mean = 0, normalize_factor = 0;
                
                for (i = 0; i < m_nSize; i++)
                        mean += m_pFeature[i];
                mean /= m_nSize;
                
                for (i = 0; i < m_nSize; i++)
                {
                        m_pFeature[i] -= mean;
                        normalize_factor += m_pFeature[i] * m_pFeature[i];
                }
                
                normalize_factor = 1 / sqrtf(normalize_factor);
                
                for (i = 0; i < m_nSize; i++)
                        m_pFeature[i] *= normalize_factor;
        }
};



#endif /* _PATCH_FEATURE_ENTRY_H_ */