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You need to add the positions of non-zero pixels in horizontal (vertical) directions and divide them by the number of columns (rows) to get the center of gravity.

You need to add the positions of non-zero pixels in horizontal (vertical) directions and divide them by the number of columns (rows) nonzero pixels to get the center of gravity.

You need to add the positions of non-zero pixels in horizontal (vertical) directions and divide them by the number of nonzero pixels to get the center of gravity.

xsum = 0;
ysum = 0;
num_nonzero_pxl = 0;
for each pixel (p(x,y))
    if pixel p(x,y) is non-zero {
        xsum += x;
        ysum += y;
        num_nonzero_pxl++;
    }
cgix=xsum/num_nonzero_pxl;
cgiy=ysum/num_nonzero_pxl;