圆及椭圆拟合输入：

图像文件seal1.jpg、seal2.jpg、coin1.jpg

任务：

尝试将上述三个文件中圆或椭圆的外轮廓拟合出来

输出要求：

1. 每个拟合圆或椭圆的中心坐标，半径或长短轴长度；

2. 将主要的中间步骤及最终拟合结果用OpenCV的cvShowImage 显示出来。-Circle and ellipse fitting type: image file seal1.jpg, seal2.jpg, coin1.jpg task: Try the above three documents outline circle or ellipse fitting out of the output requirements: 1. Each circle or ellipse fitting The center coordinates, radius, or length of the shaft length　2. the major intermediate steps and final fitting results are displayed with the OpenCV' s cvShowImage.