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Download MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES User`s guide
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7 Working with Acquired Image Data 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 (T1, T2, and T3). 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 T3, 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. 7-6
