MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guida Utente Scaricare il pdf (Pagina 222)

7 Working with Acquired Image Data

7-24

InitialTriggerTime Records First Trigger Execution

The trigger timing information is stored in MATLAB clock vector format. The following

example displays the time of the first trigger for the video input object vid. The example

uses the MATLAB datestr function to convert the information into a form that is more

convenient to view.

datestr(vid.InitialTriggerTime)

ans =

02-Mar-2007 13:00:24

Determining When a Frame Was Acquired

The toolbox provides two ways to determine when a particular frame was acquired:

• By the absolute time of the acquisition

• By the elapsed time relative to the execution of the trigger

You can use the getdata function to retrieve both types of timing information.

Getting the Relative Acquisition Time

When you use the getdata function, you can optionally specify two return values.

One return value contains the image data; the other return value contains a vector of

timestamps that measure, in seconds, the time when the frame was acquired relative to

the first trigger.

[data time] = getdata(vid);

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