EDIT: I SOLVED THE PROBLEM: SEE COMMENTS FOR MORE INFO

I am currently using Ubuntu Linux 20.04 Host version on the virtual box and am currently stuck at the final step of calibrating my two seperate cameras (Logitech B910 HD) as a stereocamera setup with the ROS Noetic distribution.

Once Ros has been installed, I created a catkin workspace in the terminal and installed the image_pipeline package with the following commands:

• cd ~/catkin_ws/src
• git clone https://github.com/ros-perception/image_pipeline.git
• git clone https://github.com/ros-visualization/rqt_reconfigure.git
• cd ~/catkin_ws
• catkin_make

Next up, I'm setting up everything for the camera_calibration package and my cameras to be available in the terminal under the catkin workspace, like so:

• sudo apt install python3-rosdep2 -y
• rosdep install camera_calibration -y
• rosmake camera_calibration
• sudo apt install ros-noetic-usb-cam -y

In a new terminal with the same workspace directory I open my launch file for the cameras to be available (Launch file should be visible at the bottom of this post):

• roslaunch src/imagepipeline/cameracalibration/src/launch/stereousbcam.launch

For the calibration window to start I firstly need to setup a rosbash and then the rosrun comman in the first terminal:

• sudo apt install ros-noetic-rosbash
• rosrun cameracalibration cameracalibrator.py --pattern chessboard --size 12x8 --square 0.03 right:=/stereo/right/imageraw left:=/stereo/left/imageraw rightcamera:=/stereo/right left_camera:=/stereo/left --no-service-check --approximate=0.1

I can see that my cameras are active and the Display window for the camera calibration starts but I get this flickering video image. I believe it has something to do with the framerate or driver connectivity, however, I searched through the web like crazy and cross-referenced lots and still have not found a single thing. Hopefully someone can help me out here.

ATTACHEMENT:

LAUNCH FILE

<launch>

<arg name="video_device_right" default="/dev/video0" />
<arg name="video_device_left" default="/dev/video2" />
<arg name="image_width" default="640" />
<arg name="image_height" default="480" />
<arg name="right_image_namespace" default="stereo" />
<arg name="left_image_namespace" default="stereo" />
<arg name="right_image_node" default="right" />
<arg name="left_image_node" default="left" />
<arg name="image_topic_name_right" default="image_raw" />
<arg name="camera_info_topic_name_right" default="camera_info" />
<arg name="image_topic_name_left" default="image_raw" />
<arg name="camera_info_topic_name_left" default="camera_info" />
<arg name="left_camera_name" default="left" />
<arg name="right_camera_name" default="right" />
<arg name="left_camera_frame_id" default="left_camera" />
<arg name="right_camera_frame_id" default="right_camera" />
<arg name="framerate" default="30" />
<arg name="camera_info" default="false" />
<arg name="camera_info_path" default="stereo_camera_info" />

<node ns="$(arg right_image_namespace)" name="$(arg right_image_node)" pkg="usb_cam" type="usb_cam_node" output="screen" >
    <param name="video_device" value="$(arg video_device_right)" />
    <param name="image_width" value="$(arg image_width)" />
    <param name="image_height" value="$(arg image_height)"/>
    <param name="pixel_format" value="yuyv" />
    <param name="io_method" value="mmap"/>
    <remap from="/usb_cam/image_raw" to="$(arg image_topic_name_right)" />
    <param name="framerate" value="$(arg framerate)"/> 
    <!-- if camera_info is available, we will use it-->
    <param name="camera_frame_id" value="$(arg right_camera_frame_id)" if="$(arg camera_info)" /> 
    <param name="camera_info_url" value="file://${ROS_HOME}/$(arg camera_info_path)/right.yaml" if="$(arg camera_info)"/>

        <param name="camera_name" value="narrow_stereo/$(arg right_camera_name)" if="$(arg camera_info)"/> 
    <remap from="/usb_cam/camera_info" to="$(arg camera_info_topic_name_right)" if="$(arg camera_info)"/>
</node>
 <node ns="$(arg left_image_namespace)" name="$(arg left_image_node)" pkg="usb_cam" type="usb_cam_node" output="screen" >
    <param name="video_device" value="$(arg video_device_left)" />
    <param name="image_width" value="$(arg image_width)" />
    <param name="image_height" value="$(arg image_height)"/>
    <param name="pixel_format" value="yuyv" />
    <param name="io_method" value="mmap"/>
    <param name="framerate" value="$(arg framerate)"/> 
    <remap from="/usb_cam/image_raw" to="$(arg image_topic_name_left)"/>
    <!-- if camera_info is available, we will use it-->
    <param name="camera_frame_id" value="$(arg left_camera_frame_id)" if="$(arg camera_info)"/> 
    <param name="camera_name" value="narrow_stereo/$(arg left_camera_name)" if="$(arg camera_info)"/> 
    <param name="camera_info_url" value="file://${ROS_HOME}/$(arg camera_info_path)/left.yaml" if="$(arg camera_info)"/> 
    <remap from="/usb_cam/camera_info" to="$(arg camera_info_topic_name_left)" if="$(arg camera_info)"/>
</node>
</launch>