function germes = super_pixel(img, K, m, n)
    N = size(img, 1) * size(img, 2);
    S = sqrt(N / K);
    X = S/2:S:size(img, 1);
    Y = S/2:S:size(img, 2);
    germes = zeros(length(X) * length(Y), 2);
    c = 1;
    for x = X
        for y = Y
            germes(c,:) = [x y];
            c = c + 1;
        end
    end
    
    c = 1;
    for germe = germes'
        x = germe(1);
        y = germe(2);
        xmin = max(x - n, 1);
        interval_x = xmin:min(x + n, size(img, 1));
        ymin = max(y - n, 1);
        interval_y = ymin:min(y + n, size(img, 2));
        Gmag = imgradient(img(interval_x, interval_y));
        [~,ind_min] = min(Gmag(:));
        [nr, nc] = ind2sub(size(Gmag), ind_min);
        x = xmin + nr - 1;
        y = ymin + nc - 1;
        germes(c,:) = [x y];
        c = c + 1;
    end
end