AttributeError:模块'cv2.cv2'没有属性'bgsegm

import numpy as np
import cv2
cap = cv2.VideoCapture('vtest.avi')
fgbg = cv2.bgsegm.createBackgroundSubtractorMOG()
while(1):
    ret, frame = cap.read()
    fgmask = fgbg.apply(frame)
    cv2.imshow('frame',fgmask)
    k = cv2.waitKey(30) & 0xff
    if k == 27:
        break
cap.release()
cv2.destroyAllWindows()

我遇到以下错误:AttributeError:模块'cv2.cv2'没有属性'bgsegm'.

I am getting the following error: AttributeError: module 'cv2.cv2' has no attribute 'bgsegm'.

我在Windows机器上使用带有OpenCV 3.6的Python 3.6. 我尝试使用pip install opencv-contrib-python命令，但在Windows机器上问题仍然相同.此命令有助于在Ubuntu系统上运行，但不能在Windows上运行.我在堆栈上搜索了类似的问题，但无法解决此问题.有人可以帮我吗?谢谢！

I am using Python 3.6 with OpenCV 3.6 on windows machine. I tried using the pip install opencv-contrib-python command but still the problem remains same on my windows machine. This command helped be on Ubuntu system, but not on windows. I searched similar problems on stack but couldn't solve this issue. Can someone help me out on this? Thanks!