中文说明：
单目视觉程序，通过对摄像机进行简单标定求出世界坐标犀利图像坐标系转换的必要参数，进而实现对固定平面内物体的位置定位及长度测量。针对该方法的特点，本文选取了4个点为标定点。
English Description：
Monocular vision program, through the simple calibration of the camera, obtains the necessary parameters of the world coordinate sharp image coordinate system transformation, and then realizes the location and length measurement of the object in the fixed plane. According to the characteristics of this method, four points are selected as the calibration points.