how to get two different images from a real time video?

In my project i have to take two images from a live video for edge detection, and i'm using getsnapshot() function but the two images taken are the same without change. Is there different function i can use for the same purpose?

Answer 1

[Vandana Rajan]

Hi,

A demo code is available in MATLAB, 'demoimaq_GetSnapshot.m'. Type 'demoimaq_GetSnapshot.m' in your MATLAB editor. This has examples of how to get multiple frames using the same video object.

Answer 2

[Image Analyst]

If you called it twice, they should be different images. You may not see a difference if nothing in your scene changes, but there should be a difference though it may be only video noise and very slight.