本程序通过对图像进行灰度化、去噪和边缘提取，能检测出不垂直的刻度线边缘并能将其旋转校正，从而达到使刻度线标准化的目的-This procedure of gray-scale images, and de-noising and edge detection can not detect the edge of the vertical line of the scale and be able to spin correction, so as to achieve so that the purpose of standardization of calibration line