if cv2.waitKey(1) & 0xFF == ord('q'): break
时间: 2024-05-21 20:10:57 浏览: 8
== ord('q'):
break
This code is checking if the user has pressed the 'q' key on their keyboard. If the user has pressed 'q', the program will exit the loop and stop running. This is commonly used in OpenCV programs to allow the user to exit the program at any time by pressing a specific key.
相关问题
if cv2.waitKey(1) & 0xFF == ord('q'): break
这行代码是在使用OpenCV库进行图像处理时常见的一种用法。它的作用是等待用户按下键盘上的 'q' 键,如果检测到按下了该键,就会退出程序的循环。
`cv2.waitKey()` 函数是一个键盘绑定函数,它的参数表示等待用户按键的时间(单位为毫秒)。如果设置为0,它将无限期地等待用户按下键盘。返回值是用户按下的键的ASCII码值。
在这行代码中,`cv2.waitKey(1)` 表示等待1毫秒,然后通过 `&` 操作符将返回的键值与 0xFF 进行按位与运算。这是因为在某些平台上,`cv2.waitKey()` 返回的键值可能包含额外的信息,而我们只关心低8位的ASCII码值。
如果返回的键值等于 ASCII码值为 'q' 的键,即用户按下了 'q' 键,就会执行 `break` 语句,从而退出循环,终止程序的运行。
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()
```
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