ros2 use camera

1.1 检查摄像头

lsusb

-------------------------------------

显示如下:

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 007: ID 046d:082b Logitech, Inc. Webcam C170
Bus 001 Device 006: ID 0461:4e2a Primax Electronics, Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

1.2 查看图像信息

(1)使用image_view节点查看图像

ros2 run image_view image_view image:=/camera1/image_raw

说明:最后面的附加选项“image:=/image_raw”是把话题列表中的话题以图像形式查看的选项。

(2)用rqt_image_view节点检查

ros2 run rqt_image_view rqt_image_view

 

(3)使用rviz查看

ros2 run rviz2 rviz2

增加image,然后将[Image] → [Image Topic]的值更改为“/image_raw”。

使用apt-get安装的软件包好像只有执行程序,没有launch文件和节点源文件等等,所以采用了自建uvc-camera软件包更该参数。

 

### Realsense T265 Camera Usage and Configuration in ROS2 For using the Realsense T265 camera within a ROS2 environment, it is essential to ensure that all necessary packages are installed correctly. The installation process involves adding specific repositories or installing pre-built binaries depending on the operating system used. To update the package environment after setting up these dependencies, executing `rospack profile` can help refresh the list of available packages although this command pertains more specifically to ROS1 environments[^1]. For ROS2, updating the workspace might involve rebuilding with colcon or sourcing the setup files again. Testing hardware like USB cameras requires ensuring drivers and related software stacks are properly set up. Similarly, for the Intel RealSense T265, one must install the appropriate ROS2 wrapper provided by Intel which includes nodes designed explicitly for interfacing with this device type. Running applications with parameters in ROS2 uses commands such as `ros2 run`, where arguments follow directly after specifying the node name and executable. When launching complex configurations involving multiple components including sensors like the T265, creating dedicated `.launch.py` scripts simplifies management through the use of `ros2 launch`. These Python-based launch files allow defining groups of actions, remappings, and parameter overrides programmatically[^2]. #### Example Launch File Snippet for Starting T265 Node ```python from launch import LaunchDescription import launch_ros.actions def generate_launch_description(): return LaunchDescription([ launch_ros.actions.Node( package='realsense2_camera', namespace='/camera', executable='t265_node', name='t265_node', output='screen' ) ]) ```
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