calculating new values for the x axis

I am trying to implement the 2 convolution.

I am trying to calculate new x and y values for the a copy pf theoutput in opencv and then after the math calculations I copy the image into the original output image. When I compile and look at the new output picture no changes have been made Am I calculating the new values for the x and y axis correctly?

Could someone help me out ? Thank you in advance.

convolution(const Mat &input, Mat &output, const Mat &kernel) {

    Mat copy_of_input  = (Mat_<float>(3,3));
    int border = 1;
    Mat copy_out;
    copyMakeBorder(input, copy_of_input, border, border,border,border, BORDER_REPLICATE);

    for(int x=0; x < copy_of_input.rows; ++x)              
    {
        for(int y=0; y < copy_of_input.cols; ++y)          
        {
            for(int kx=0; kx < kernel.rows; ++kx)     
            {  
                for(int ky=0; ky < kernel.cols; ++ky) 
                { 
                    x = copy_of_input.at<int>(x,y)*(y+ky-((kernel.rows-1)/2))*kernel.at<float>(ky,kx);  
                    //new x value for copy_of_input

                    y =  copy_of_input.at<int>(x,y)*(x+kx-((kernel.cols-1)/2))*kernel.at<float>(ky,kx);
                    //new y value for copy_of_input                
                }
            }
        }
    }
    copy_of_input.copyTo(output);
}