Python 如何解决类型错误：预期Ptr<；cv:：UMat>；对于参数'；src'；？

我正试图用face_cascade在视频中突出显示人脸。我的代码：

import cv2
face_cascade = cv2.CascadeClassifier('D:/Anaconda/Lib/site-packages/cv2/data/haarcascade_frontalface_default.xml')
frame2 = cv2.VideoCapture('C:/Users/HomePC/Desktop/video.mp4')
scaling_factor = 0.5
frame2 = cv2.resize(frame2, None, fx=scaling_factor, fy = scaling_factor, interpolation = cv2.INTER_AREA)
face_rects2 = face_cascade.detectMultiScale(frame2, scaleFactor = 1.3, minNeighbors = 6)
for (x,y,w,h) in face_rects2:
    cv2.rectangle(frame2, (x,y), (x+w,y+h), (0,255,0), 3)
cv2.imshow('Input video', frame2)
print('Found {0} faces in Input video!'.format(len(face_rects2)))

但我有一个问题：

runfile('C:/Users/HomePC/Desktop/ArtInt/3lab/lab3.py', wdir='C:/Users/HomePC/Desktop/ArtInt/3lab')
Traceback (most recent call last):

  File "C:\Users\HomePC\Desktop\ArtInt\3lab\lab3.py", line 29, in <module>
    frame2 = cv2.resize(frame2, None, fx=scaling_factor, fy = scaling_factor, interpolation = cv2.INTER_AREA)

TypeError: Expected Ptr<cv::UMat> for argument 'src'

runfile（'C:/Users/HomePC/Desktop/ArtInt/3lab/lab3.py'，wdir='C:/Users/HomePC/Desktop/ArtInt/3lab'）
回溯（最近一次呼叫最后一次）：
文件“C:\Users\HomePC\Desktop\ArtInt\3lab\lab3.py”，第29行，在
frame2=cv2.resize（frame2，无，fx=scaling\u factor，fy=scaling\u factor，插值=cv2.INTER\u区域）
TypeError:参数'src'应为Ptr