How to use waitKey in python

This article mainly explains "how to use waitKey in python". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn how to use waitKey in python.

Description

1. Used to wait button. When the user presses the button, the sentence is executed and the return value is obtained.

2. The syntax is

Retval=cv2.waitKey ([delay])

Retval: indicates the return value; Delay: the time when the key was triggered, in ms.

Example

Import cv2lena=cv2.imread ("D:\ pmjcv\ lena.bmp") cv2.namedWindow ("lesson") cv2.imshow ("lesson", lena) key=cv2.waitKey () Python is mainly used for what Python is mainly used for:

1. Web development

2. Data science research

3. Web crawler

4. Embedded application development

5. Game development

6. Desktop application development.

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