User`s guide

6 Acquiring Image Data

6-12

Manual Trigger

The following example illustrates how to use a manual trigger:

Create an image acquisition object — This example creates a video input object

for a webcam image acquisition device. To run this example on your system, use the

imaqhwinfo function to get the object constructor for your image acquisition device

and substitute that syntax for the following code.

vid = videoinput('winvideo',1);

Verify that the object has not acquired any frames.

vid.FramesAcquired

ans =

Configure properties — Set the video input object's TriggerType property

to 'Manual'. To set the values of certain trigger properties, including the

TriggerType property, you must use the triggerconfig function. See “Setting

the Values of Trigger Properties” on page 6-6 for more information.

triggerconfig(vid, 'Manual')

This example also sets the value of the FramesPerTrigger property to 5. (The

default is 10 frames per trigger.)

vid.FramesPerTrigger = 5