通过对图像中值滤波处理，二值化，边缘查询，找出图像中源所有的边缘像素点，然后利用最小二乘法对这些边缘点进行找圆，计算出圆的坐标和半径。(By means of median filtering, binarization and edge query, all edge pixels in the image source are found, and then the least square method is used to fi