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I have achieved to set fTau parameter by inheritance;

Declare a custom class

class BackgroundSubtractorMOG2Custom: public BackgroundSubtractorMOG2{ public: void setTau(float val){fTau = val;} };

Then;

BackgroundSubtractorMOG2Custom bgmodel; bgmodel.setTau(0);

I have achieved to set fTau parameter by inheritance;

Declare a custom class

class BackgroundSubtractorMOG2Custom: public BackgroundSubtractorMOG2{
public:
void setTau(float val){fTau = val;}
};
};

BackgroundSubtractorMOG2Custom bgmodel;
bgmodel.setTau(0);
bgmodel.setTau(0);

I have achieved to set fTau parameter by inheritance;

Declare a custom class

class BackgroundSubtractorMOG2Custom: public BackgroundSubtractorMOG2{
public:
    void setTau(float val){fTau = val;}
};

Then;

BackgroundSubtractorMOG2Custom bgmodel;
bgmodel.setTau(0);
bgmodel.setTau(0.35);