cv2画多边形报错Overload resolution failed:＞ - Can‘t parse ‘pts‘. Sequence item with index 0 has a wrong t

报错：

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

代码：

pts = [[1,2],[3,4]]
isClosed, color,thickness = True,(0,255,0),1
cv2.polylines(img, pts, isClosed, color,thickness)

原因：不是没有从浮点转换为整数，而是在此之外，还需要再转为numpy，int32, 加括号
解决：

# 正确的写法
pts = np.array(pts,np.int32)
cv2.polylines(img, [pts], isClosed, color,thickness)

参考1