Hi Jacob,
The imaq.VideoDevice System object returns a frame at the time the step() is called. There is no buffering of frames that happen in this scenario and it returns the latest frame. In essence, frames can be skipped depending on the speed of execution.
You can use the videoinput() object to perform your task:
vi = videoinput(....);
set(vi, 'FramesPerTrigger', 100)
frame = getdata(vi, N) % where N is number of frames to receive.
The frames received are stored in a buffer and hence call to the next getdata returns the oldest frames (no frames being skipped).
Thanks
Shankar
