显示没有waitKey的图像 [英] Displaying image without waitKey

问题描述

此 Python 代码以全屏方式显示图像:

This Python code displayed an image in full screen:

blank_image = cv2.imread('blank.jpg')
cv2.namedWindow("bw", cv2.WND_PROP_FULLSCREEN)          
cv2.setWindowProperty("bw", cv2.WND_PROP_FULLSCREEN, cv2.cv.CV_WINDOW_FULLSCREEN)
cv2.imshow("bw", blank_image)
cv2.waitKey(0)

问题是代码将在没有键盘的 Linux 机器上运行.调用waitKey就意味着要等到按键事件发生才会进行UI处理，因此矛盾.

The problem is the code is going to run on a Linux machine without keyboard. Calling waitKey means the UI processing will not be done until a key event occurs, and thus the contradiction.

那除了waitKey还有什么办法吗?

Is there any way beside the waitKey, then?

推荐答案

只是为了澄清:来自 docs 你可以看到

Just to clarify: from the docs you can see that

Python: cv2.waitKey([delay]) → retval

Python: cv2.waitKey([delay]) → retval

函数waitKey无限等待一个按键事件(当delay <= 0 ) 或延迟毫秒，当它为正时.

The function waitKey waits for a key event infinitely (when delay <= 0 ) or for delay milliseconds, when it is positive.

如果您使用 delay = 0，那么您的程序将无限等待关键事件，从而阻止执行.正如@Miki 所说，您可以使用 delay = 1，这样 waitKey 就不会阻塞.

If you use the delay = 0, then your program waits for a key event infinitely, blocking the execution. As @Miki said, you can use delay = 1, so that waitKey won't block.

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