MATLAB IMAGE ACQUISITION TOOLBOX 3 Guía de usuario descargar pdf (Pagina 142)

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5 Acqu iring Image Data

Contents of Memor y Buffer Before and After Removing Frames

6 Clean up — Always rem ove image acquisition objects from mem ory, and

the variables that re ference them, when you n o longer need them.

delete(vid)

clear vid

Delaying Data Logging A fter a Trigger

In some image acquisition setups, you might not want to lo g the first few

frames returned from your camera or other imaging device. For example,

some cameras require a short warmup time when activated. The quality of

the first few images returned by these cameras might be too dark to be u seful

foryourapplication.

To account for this characteristic of your setup, you can specify that the

toolbox skip a specified number of frames after a trigg er executes. You use

the

TriggerFrameDelay property to specify the number of frames y ou want to

skip before logging begins.

Fo r examp le, t o specify a delay of five f r ames before data logging begins after a

trigger executes, you would set the value of the

TriggerFrameDelay property

to 5. The number of frames captured is d efined by the

FramesPerTrigger

property and is unaffected by the de lay.

set(vid,'TriggerFrameDelay',5);

This figure illustrates this scenario.

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