How to log image data acquired by imaqtool to disk with repeated triggers.

Question

Yuhan Yang 2021-1-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/718890-how-to-log-image-data-acquired-by-imaqtool-to-disk-with-repeated-triggers

回答： Anshika Chaurasia 2021-1-19

Here's an example code from the documentation, which waits for 100 triggers and acquires 5 frames for each trigger. I wonder how to log the image data into disk during the acquisition? I know we can get all data after the acqusition, such as data = getdata(vid,nFrames). However if the acqusition is long, it may run out of the memory, right? How to log image data into disk during the acquisition with repeated triggers?

% Create video input object. 
vid = videoinput('dcam',1,'Y8_1024x768')
% Set video input object properties for this application.
vid.TriggerRepeat = 100;
vid.FramesPerTrigger = 5;
% Set value of a video source object property.
vid_src = getselectedsource(vid);
vid_src.Tag = 'motion detection setup';
% Create a figure window.
figure; 
% Start acquiring frames.
start(vid)
% Calculate difference image and display it.
while(vid.FramesAvailable >= 2)
    data = getdata(vid,2); 
    diff_im = imabsdiff(data(:,:,:,1),data(:,:,:,2));
    imshow(diff_im);
    drawnow     % update figure window
end
stop(vid)