Two axes vs. Single with [ im , im2 ]

1 次查看(过去 30 天)
Hi I am making a GUI and comparing options of showing the videos inside.
I will be showing them side by side and wanted to try the two opstion mention above.
I would expect them to be running equally fast as I am plotting the same amount of pixels are the same, but the difference is huge.
Ofcourse cat is costing something to run, but when profilling I see a large increase in drawnow.
Is this simply because having two axes enables matlab to start plotting one while starting to read the other? or is there something about having to concat images that just takes longer due to how the code is interperted.
Hope someone has a bit more experience and could confirm my assumption or inform me about the cause, thank you in advance!
Code two axes:
while bVideoRunning
im = cellfun(@readFrame,VideoObjects,'UniformOutput',false);
imconcat = cat(2,im{1},im{2}) % I have also tried imconcat = [im{:}] but it is not faster the same with not using cellfun
set(hImage1, 'CData' ,imconcat);
drawnow
end
Code concat images:
while bVideoRunning
im = readFrame(VideoObjects);
set(hImage1, 'CData' ,im);
im2 = readFrame(VideoObjects2);
set(hImage2, 'CData' ,im2);
drawnow
end
  5 个评论
Johan Svendsen
Johan Svendsen 2021-2-8
Amazing Walter! that worked, so would this indicate that is is because it can start plotting one then the other? or what is the cause of this performance difference?
Walter Roberson
Walter Roberson 2021-2-8
Unfortunately I have no useful speculation about that at the moment.

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