SAD.h

#ifndef MTF_SAD_H
#define MTF_SAD_H

#include "AppearanceModel.h"

_MTF_BEGIN_NAMESPACE

struct SADDist : AMDist{
    typedef bool is_kdtree_distance;
    typedef double ElementType;
    typedef double ResultType;
    SADDist(const string &_name) : AMDist(_name){}
    double operator()(const double* a, const double* b,
        size_t size, double worst_dist = -1) const override;
    double accum_dist(const double& a, const double& b, int) const{
        return fabs(a - b);
    }
};

class SAD : public AppearanceModel{

public:
    typedef AMParams ParamType;
    typedef SADDist DistType;

    SAD(const AMParams *am_params = nullptr,
        const int _n_channels = 1);
    void initializeSimilarity() override;

    double getLikelihood() const override;
    //-----------------------------------------------------------------------------------//
    //-------------------------------update functions------------------------------------//
    //-----------------------------------------------------------------------------------//
    void updateSimilarity(bool prereq_only = true) override;
    
    const DistType* getDistFunc() override{
        return new DistType(name);
    }
    void updateDistFeat(double* feat_addr) override{
        for(size_t pix = 0; pix < feat_size; ++pix) {
            *feat_addr++ = It(pix);
        }
    }
    void initializeDistFeat() override{}
    void updateDistFeat() override{}
    const double* getDistFeat() override{ return It.data(); }
    unsigned int getDistFeatSize() override{ return feat_size; }

protected:
    double likelihood_alpha;
    unsigned int feat_size;
};

_MTF_END_NAMESPACE

#endif