TypeError。在Python中使用mss库时，参数'mat'预期为Ptr<cv::UMat>。

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我试图用mss库截图，用下面的代码来显示，但每次都得到同样的错误。有什么方法可以解决这个错误吗？

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

** 我是在Macos中使用的，不是在windows中。

import cv2 as cv
import numpy as np
import os
from time import time
from mss import mss
os.chdir(os.path.dirname(os.path.abspath(__file__)))
loop_time = time()
with mss() as sct:
    while (True):
        monitor_1 = sct.monitors[1]  # Identify the display to capture
        screenshot = sct.grab(monitor_1)
        cv.imshow('result', screenshot)
        print('FPS {}',format(1 / (time() - loop_time)))
        loop_time = time()
        if cv.waitKey(1) == ord('q'):
            cv.destroyAllWindows()
            break
print('done')


         python


         opencv


         python-mss


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           你必须将 "屏幕截图 "转换为cv::UMat。
          
          import time
import cv2
import mss
import numpy
with mss.mss() as sct:
    # Part of the screen to capture
    monitor = {"top": 40, "left": 0, "width": 800, "height": 640}
    while "Screen capturing":
        last_time = time.time()
        # Get raw pixels from the screen, save it to a Numpy array
        img = numpy.array(sct.grab(monitor))
        # Display the picture
        cv2.imshow("OpenCV/Numpy normal", img)
        # Display the picture in grayscale
        # cv2.imshow('OpenCV/Numpy grayscale',
        #            cv2.cvtColor(img, cv2.COLOR_BGRA2GRAY))
        print("fps: {}".format(1 / (time.time() - last_time)))
        # Press "q" to quit