real-time acquiring and displaying image via camera

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tren
tren el 20 de Dic. de 2022
I am using a USB camera to acquire and display frames with some basic image processing (displaying a line on top).
when i write
preview(vid)
i can get a video preview of almost 10FPS dispalyed as video.
but when i code like:
loop start
start(vid);
trigger(vid);
f=getdata(vid,1);
%insertshape to add line to image
imshow(f)
loop ends
the dispaly rate is very slow almost 1 frame per 1.6 sec.
How can I code to acquire and display images faster from my cam?

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R2018b

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