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again, there should not be any cv::Point's here at all, and your Operator should look like:

struct Operator {
    void operator ()(uchar &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= %d \n",position[0],position[1], pixel);      
    }
};

(also, those typedefs are more misleading than helpful, you're safe to skip them and use explicit types there)

again, there should not be any cv::Point's here at all, and your Operator should look like:

struct Operator {
    void operator ()(uchar &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= %d \n",position[0],position[1], pixel);      
    }
};

or, for a 3 channel bgr image:

struct Operator {
    void operator ()(Vec3b &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= (%d %d %d)\n",position[0],position[1], pixel[0], pixel[1], pixel[2]);      
    }
};

(also, those typedefs are more misleading than helpful, you're safe to skip them and use explicit types there)