为什么在 openCV 中删除 waitKey() 不起作用? [英] Why removing waitKey() in openCV doesn't work?

问题描述

我开始使用带有 Python 3 的 OpenCV，我有以下代码段:

I'm starting out with OpenCV with Python 3 and I have the following snippet:

import cv2
video = cv2.VideoCapture(0)

while True:
    success, captured_frame = video.read()
    cv2.imshow('Video', captured_frame)
    pressed_key = cv2.waitKey(1) & 0xFF

    if pressed_key == ord('q'):
    break

video.release()
cv2.destroyAllWindows()

如果我删除 pressed_key 变量及其条件，程序会运行，但视频窗口是空白的，Windows 会尝试强制退出程序.这是为什么?

If I remove the pressed_key variable along with its condition, the program runs but the Video window is blank and Windows attempts to force quit the program. Why is that?

推荐答案

opencv 在 waitKey 时间执行窗口渲染，因此您至少需要调用 waitKey(1) 来查看一些窗口内容.

opencv performs window rendering during waitKey times, so you will need at least a waitKey(1) call to see some window content.

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