function [cont]=max_contour(contours)
i=1;
id=1;
max = 0;
while i+contours(2, id) < size(contours, 2)
    contours(2,i);
    if contours(2,i) > max
        max = contours(2,i);
        id = i;
    end
    i=i+1+contours(2,i);
end

cont = zeros(max, 2);
cont(1:end,1) = contours(1, id+1:id+max);
cont(1:end,2) = contours(2, id+1:id+max);

end