检测圆形的失真度，即椭圆的长轴和短轴之比。例如可以应用在圆形器件的检测等方面，内部放了部分实验图片-To detect the distortion of the circular, the ratio of the long axis and short axis of the ellipse. For example, can be applied in the detection of circular devices, etc., the internal part of the exp