The waitKey function in the matplotlib library is used to pause execution of a program until a key press event occurs.

It is typically used in conjunction with the imshow function to display images and wait for user input before continuing.

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Here is an example of how you can use waitKey in a Python program:

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import cv2

import matplotlib.pyplot as plt

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# Load an image

img = cv2.imread('image.jpg')

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# Display the image using matplotlib

plt.imshow(img)

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# Wait for the user to press a key

plt.waitKey(0)

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# Close the window

plt.close()

In this example, the imshow function is used to display the image, and the waitKey function is used to pause execution until the user presses a key.

The waitKey function takes an integer argument that specifies the maximum time to wait in milliseconds. If the argument is set to 0, the function will wait indefinitely until a key is pressed.

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I hope this helps! Let me know if you have any other questions or need further assistance.