if cv2.waitKey(1) & 0xFF == ord('q'): break 的代码解释

The `cv2.waitKey()` function is used in OpenCV to wait for a key event for a specified amount of time. The argument passed to this function is the time in milliseconds to wait for a key event.

If `cv2.waitKey(1)` is called, it waits for 1 millisecond for a key event. This function is often used in conjunction with `cv2.imshow()` to display images in a window and wait for user input.

In many cases, `cv2.waitKey()` is used in a loop to continuously display images and wait for user input until a specific key is pressed. For example, the following code waits for the 'q' key to be pressed before exiting:

while True:
    cv2.imshow('image', img)
    if cv2.waitKey(1) == ord('q'):
        break
cv2.destroyAllWindows()