Opencv报错1：Can‘t parse ‘center‘. Sequence item with index 0 has a wrong type

Opencv报错1：Can‘t parse ‘center‘. Sequence item with index 0 has a wrong type

问题描述：在利用opencv中霍夫圆检测方法来检测图像中圆形物体时，代码如下：

# 1 读取图像，并转换为灰度图
planets = cv.imread("./xingqiu.png")
gay_img = cv.cvtColor(planets, cv.COLOR_BGRA2GRAY)
# 2 进行中值模糊，去噪点
img = cv.medianBlur(gay_img, 7)
# 3 霍夫圆检测
circles = cv.HoughCircles(img, cv.HOUGH_GRADIENT, 1, 200, param1=100, param2=30, minRadius=0, maxRadius=100)
# 4 将检测结果绘制在图像上
for i in circles[0, :]:  # 遍历矩阵每一行的数据
    cv.circle(planets, (i[0], i[1]), i[2], (0, 255, 0), 2)
    cv.circle(planets, (i[0], i[1]), 2, (0, 0, 255), 3)

错误描述：

cv2.error: OpenCV(4.5.4-dev) :-1: error: (-5:Bad argument) in function 'circle'
> Overload resolution failed:
>  - Can't parse 'center'. Sequence item with index 0 has a wrong type
>  - Can't parse 'center'. Sequence item with index 0 has a wrong type

错误原因：cv.circle()函数中的圆心坐标不能是浮点数的类型, 要转换成整数才行，于是就使用int()强制类型转换，之后代码成功运行。如下所示：

cv.circle(planets, (int(i[0]), int(i[1])), int(i[2]), (0, 255, 0), 2)
cv.circle(planets, (int(i[0]), int(i[1])), 2, (0, 0, 255), 3)