利用霍夫变换进行椭圆检测，无需模板，不同的图片只需要更改个别参数-Ellipse detection using Hough transform, without templates, a different picture only need to change individual parameters

图形检测，hough变换检测直线、圆、椭圆。-Pattern detection, hough transform to detect straight line, circle, ellipse.

基于椭圆的几何性质确定椭圆的两个参数，再结合hough确定另外三个参数，实现椭圆的检测-Based on the geometric properties of the ellipse to determine the two parameters of the ellipse, and then combined with Hough to determine the other three parameters, to achieve the detection of ellipse