User`s guide

5 Acqu iring Image Data

2 Configure properties — Specify the amount of data you want to acquire

as the number of frames per trigger. By default, a video input o bj ect

acquires 10 frames per trigger. For this example, set the value of this

property to

100.

set(vid,'FramesPerTrigger',100)

3 Start the image acquisition object -— Cal l the start function to start

the image acquisition object.

start(vid)

The object executes an immediate trigger and begins acquiring frames of

data. To verify if the video input object is logging data, use the

islogging

function.

islogging(vid)

ans =

The start function returns control to the command line immediately but

the object continues logging the data to the memory buffer. After acquiring

the specified number of frames, the object stops running and l ogging.

4 Check how many frames have been acquired — To verify that the

specified number of frames has been acquired, check the value of the

FramesAcquired property. Note that the object continuously updates the

value o f the

FramesAcquired property as the acquisition pro gresses. If you

view the value of this property several times during an acquisition, you can

see the number of frames acquired increase until logging stops.

vid.FramesAcquired

ans =

100

5 Clean up Always remove image acquisition objects from mem ory, and the

variables that reference them, when you no long er need them.

delete(vid)

clear vid

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