提取二值图像的轮廓，根据hu矩求轮廓质心点(Extract the contour of the two value image, and calculate the contour centroid point according to the Hu moment)

数字图像二值化，canny边缘检测并提取轮廓进行椭圆拟合找出质心点(Two values of digital image, Canny edge detection and extraction of contour by ellipse fitting to find the centroid point)