Python OpenCV - waitKey() Function

Last Updated : 03 Jan, 2023
Comments
Improve
Suggest changes
Like Article
Like
Report

waitkey() function of Python OpenCV allows users to display a window for given milliseconds or until any key is pressed. It takes time in milliseconds as a parameter and waits for the given time to destroy the window, if 0 is passed in the argument it waits till any key is pressed. 

Examples 1: Display image with a time limit

Using waitKey() method we show the image for 5 seconds before it automatically closes. The code will be as follows:

Python 
# importing cv2 module
import cv2

# read the image
img = cv2.imread("gfg_logo.png")

# showing the image
cv2.imshow('gfg', img)

# waiting using waitKey method
cv2.waitKey(5000)

Output:

Example 2: Display image until key pressed

Now we can see one example of passing 0 as the parameter. This time instead of automatically closing the window would wait till any key is pressed. The code will be:

Python 
# importing cv2 module
import cv2

# read the image
img = cv2.imread("gfg_logo.png")

# showing the image
cv2.imshow('gfg', img)

# waiting using waitKey method
cv2.waitKey(0)

Output:


Next Article
Python OpenCV - startWindowThread() Function

Y
yashgupta0524
Improve
Article Tags :
Practice Tags :

Similar Reads