How do I perform time lapse image acquisition and save individual images?

I want to perform time-lapse image acquisition, saving each acquired frame as a separate image.

Answer 1

[MathWorks Support Team]

Follow a modified form of the approach example is this example:

https://www.mathworks.com/help/imaq/creating-time-lapse-video-using-a-noncontiguous-acquisition.html

Instead of logging to disk, log data to memory. Use the FramesAcquiredFcn callback to save individual frames as images:

​vid = videoinput('winvideo');

%% Do actual time-lapse acquisition
framerate = 17.5296; % Previously calculated according to example

capturetime = 30;
vid.FrameGrabInterval = 10;
vid.FramesPerTrigger = floor(capturetime * framerate / vid.FrameGrabInterval);
vid.FramesAcquiredFcnCount = 1; % Execute callback for each frame
vid.FramesAcquiredFcn = @saveFrame;

start(vid);
wait(vid, Inf);

function saveFrame(vid, event)
    image = getdata(vid, 1);
    imwrite(image, [num2str(vid.FramesAcquired) '.jpg']);
end