Large memory usage for image acquisition app

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Ramu Pradip 2021-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/1463254-large-memory-usage-for-image-acquisition-app

评论： DGM 2021-10-5

I have written an app for acquiring images from a allied vision camera (gige cam interface) and then to plot histogram of an user defined region of interest. The app works fine for 10 mins and then it failed because memory usage increases steadily.

Camera parameters

app.cam = videoinput('gige', 1, 'Mono8');

app.src = getselectedsource(app.cam);

% Setting initial parameters

app.cam.TriggerRepeat = inf;

app.cam.FramesPerTrigger = 1;

app.cam.Timeout = 30;

Main loop

trigger(app.cam);

frame = getdata(app.cam);

image(app.livecam, 'Cdata', frame);

if ~isempty(app.roi)

app.roi = round(app.roi);

rectangle(app.livecam,'Position',app.roi,'EdgeColor','g')

img = frame(app.roi(2): app.roi(2) + app.roi(4), app.roi(1):app.roi(1)+app.roi(3));

updateHistogram(app, img)

end

Each frame is ca. 800 x 400 pixels.

Could anyone help me solve my app's memory issue ?

Thank you.

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Ramu Pradip 2021-10-5

On the contrary to what I read on several threads, found that imshow(frame,'Parent',app.livecam); is less of memory hog than updating just Cdata - image(app.livecam, 'Cdata', frame);

DGM 2021-10-5

I'm not sure of the behavior given what you've shown, but you might want to double-check to make sure that you're not stacking things in that particular axes. That's kind of a classic way to unintentionally eat memory. Just check the 'children' property of the axes to make sure that there aren't a bunch of images stacked up.

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