function minimum = get_min_reverse_raster(img, i, j)
    if i==size(img, 1) || j==size(img, 2)
        bottomright = intmax;
    else
        bottomright = img(i+1, j+1);
    end
    if i==size(img, 1)
        bottom = intmax;
    else
        bottom = img(i+1, j);
    end
    if j==size(img, 2)
        right = intmax;
    else
        right = img(i, j+1);
    end
    if j==1 || i==size(img, 1)
        bottomleft = intmax;
    else
        bottomleft = img(i+1, j-1);
    end
    minimum = min([bottomright, bottom, right, bottomleft]);
end