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Help with ROS image acquisition and processing

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Cullen Wilcox
Cullen Wilcox on 19 Jan 2018
Commented: kasra azizi on 20 May 2021
Hi there, I am currently working on a project involving a Bebop 2, ROS, and Matlab.
Here is the dilemma. The goal for this project is to interact with the Bebop using Matlab.
I am having an issue while acquiring images from the bebop. I find this quite peculiar. This is a more or less situation but basically the longer I run the code the longer the delay in the image is.
my code is pretty simple,
cam = rossubscriber('/bebop/image_raw');
tic;
while toc < 500
databad = receive(cam);
data = readImage(databad);
imshow(data)
end
For what ever reason, the lag time in the image goes from .5 seconds to almost 5 seconds over the course of a few seconds.
If anyone can help that would be awesome!

Answers (2)

Andres Drago
Andres Drago on 13 Nov 2018
Could you solve the delay problem? I'm working with the BB2 + ROS + Matlab and i have a delay of 5~7 seconds.

Srijith Vijay
Srijith Vijay on 19 Aug 2019
Did you try having a 'drawnow' after the 'imshow' command?
Something like:
...
...
imshow(data);
drawnow; % To refresh the image window with new image, instantaneously
..

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