MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Podręcznik Użytkownika Pobierz pdf (Strona 204)

100

101

7 Working with Acquired Image Data

7-6

delete(vid)

clear vid

Viewing Frames in the Memory Buffer

To view sample frames from the memory buffer without removing them, use the

peekdata function.

The peekdata function always returns the most recently acquired frames in the

memory buffer. For example, if you request three frames, peekdata returns the most

recently acquired frame in the buffer at the time of the request and the two frames that

immediately precede it.

The following figure illustrates this process. The command peekdata(vid,3) is called

at three different times (T

, T

, and T

). The shaded frames indicate the frames returned

by peekdata at each call. (peekdata returns frames without removing them from the

memory buffer.)

Note in the figure that, at T

, only two frames have become available since the last call

to peekdata. In this case, peekdata returns only the two frames, with a warning that it

returned less data than was requested.

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