至少输入五个点，得到最小二乘模拟椭圆，最后得到椭圆左右焦点以及主轴与x轴夹角等具体参数-[Xc,Yc,A,B,Phi,P]=ELLIPSEFIT(X,Y) finds the least squares ellipse that best fits the data in X and Y. X and Y must have at least 5 data points. Xc and Yc are the x- and y-axis center of the ellipse re