使用mss和openCV捕获监听

Question

我正在尝试在openCV窗口中不断循环屏幕截图。

我需要的屏幕截图是快速的，我在Mac上，否则我会使用windowsGui应用程序接口。

我收到一个错误：

    Traceback (most recent call last):
  File "main.py", line 13, in <module>
    with mss as sct:
AttributeError: __enter__

当前代码：

import cv2 as cv
import numpy as np
from time import time
from PIL import ImageGrab
from mss import mss

loop_time = time()

with mss() as sct:
    monitor = {"top": 40, "left": 0, "width": 800, "height": 640}

    while(True):
        with mss as sct:

            screenshot = np.array(sct.grab(monitor))
            screenshot = cv.cvtColor(screenshot, cv.COLOR_RGB2BGR)

            cv.imshow('Computer Vision', screenshot)

            print('FPS {}'.format(1 / (time() - loop_time)))
            loop_time = time()

            if cv.waitKey(1) == ord('q'):
                cv.destroyAllWindows()
                break


print('Done.')

Answer 1

我找出了问题所在，抛出错误是因为我有两个with语句..

所以正确的代码应该是：

    loop_time = time()

with mss() as sct:
    monitor = {"top": 40, "left": 0, "width": 800, "height": 640}

    while(True):

        screenshot = np.array(sct.grab(monitor))
        screenshot = cv.cvtColor(screenshot, cv.COLOR_RGB2BGR)

        cv.imshow('Computer Vision', screenshot)

        print('FPS {}'.format(1 / (time() - loop_time)))
        loop_time = time()

        if cv.waitKey(1) == ord('q'):
            cv.destroyAllWindows()
            break


print('Done.')