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 header file --------------------

class Blending
{
public:
    Blending(void)
    {
        alpha = beta = key = defaultvalue = 0;
    }

    static void Blend(int, void*);
    int Blended();
    //int imageinput();
     double alpha, beta;
     int  key;
     int defaultvalue;
};

cpp and main file----------

int maximumvalue = 100;
    int defaultvalue = 50;

    void Blending::Blend(int, void*)
    {

        Blending blean;
        blean.alpha = (double)blean.defaultvalue / 100;
        addWeighted(img, blean.alpha,img2, 1.0 - blean.alpha, 0, des);
        imshow("Blendimage", des);
    }

int main()
{

            Blending::Blend(defaultvalue, 0);
            createTrackbar("Blend", "Blendimage", &defaultvalue,maximumvalue,Blending::Blend);

        waitKey(0);
}

when i run the code everything works well but the images in the windows does not blend, any help