ISO 2971:2013规定了一种非接触光学测量方法，用于测定标称圆形或椭圆形截面为凸曲线的杆状物体的平均直径、最小直径和最大直径以及椭圆度（或圆度）。该方法尤其适用于香烟和过滤棒。

ISO 2971:2013 specifies a non contact, optical method of gauging for determination of the mean, minimum and maximum diameters and the ovality (or roundness) of rod-shaped objects with a nominally circular or oval cross section that is convex curvilinear. The method is applicable, in particular, to cigarettes and filter rods.