Hi Frederik,
As per my understanding, you are trying to capture images from two cameras simultaneously and save them to a folder, but the process is too slow.
After analysing the performance of the code, the bottleneck seems to be the “getsnapshot” function. Each call to the function is taking approximately 2 seconds.
To optimise this process, it would be more efficient to record a video rather than taking individual photos. This way, one can easily extract frames at desired intervals, ensuring that the necessary images are captured.
For comparison, time taken to click 10 images by a single camera is around 24.76 seconds. By capturing frames from a video, 10 frames can be captured in ~9 seconds.
Please refer to the below code snippet to record a video using a camera and access its frames:
% Set up the video input object
v = videoinput("winvideo", 1, "YUY2_1280x720"); % modify property based on your camera
% Set the properties for the video object
% Set frames per trigger to 5 seconds worth of frames
% Assuming the default frame rate is 20 frames per second
fps = 20; % Default frames per second, change if different
duration = 5; % Duration of recording in seconds
framesPerTrigger = duration * fps;
set(v, 'FramesPerTrigger', framesPerTrigger);
% Set the trigger repeat to 0 to only run acquisition once
set(v, 'TriggerRepeat', 0);
% Set the returned color space to RGB
set(v, 'ReturnedColorSpace', 'rgb');
tic; % Start timer for this iteration
% Start the video acquisition
start(v);
% Wait until the acquisition is finished
wait(v, duration + 5);
% Retrieve the frames and timestamps
[frames, timestamps] = getdata(v, v.FramesAvailable);
% Stop the video object
stop(v);
elapsedTime = toc; % End timer for this iteration
fprintf('Time taken for iteration: %.6f seconds\n', elapsedTime);
% Extract and display a frame
for i = 1:2*duration
% Calculate the frame index
frameIndex = i * fps/2;
% Extract the frame
frame = frames(:,:,:,frameIndex);
% the frame can be saved after preprocessing
% Display the frame
imshow(frame);
title(sprintf('Captured frame %d', i));
% Pause for a moment to display the frame
pause(1);
end
% Clean up by deleting the video object
delete(v);
Please refer to the following documentation of ‘videoinput’ for more information:
Hope this helps!
