MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Podręcznik Użytkownika Pobierz pdf (Strona 411)

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getdata

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information about the corresponding frame in data. The metadata structure contains

these fields:

Metadata Field Description

'AbsTime' Absolute time the frame was acquired, expressed as a time

vector

'FrameNumber' Number identifying the nth frame since the start command

was issued

'RelativeFrame' Number identifying the nth frame relative to the start of a

trigger

'TriggerIndex' Number of the trigger in which this frame was acquired

In addition to the fields in the above table, some adaptors may choose to add other

adaptor-specific metadata as well.

getdata is a blocking function that returns execution control to the MATLAB workspace

after the requested number of frames becomes available within the time period

specified by the object's Timeout property. The object's FramesAvailable property is

automatically reduced by the number of frames returned by getdata. If the requested

number of frames is greater than the frames to be acquired, getdata returns an error.

It is possible to issue a Ctrl+C while getdata is blocking. This does not stop the

acquisition but does return control to MATLAB.

Examples

Construct a video input object associated with a Matrox device at ID 1.

obj = videoinput('matrox', 1);

Initiate an acquisition and access the logged data.

start(obj);

data = getdata(obj);

Display each image frame acquired.

imaqmontage(data);

Remove the video input object from memory.

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