ROS2 Useing camera

   image_view usb_cam 

1、USB_CAM

    USB_CAM:并非传统意义上的Linux驱动,而是一个ROS(Robot Operating System,机器人操作系统)驱动。它是一个应用程序,通过V4L2接口设置摄像头并获取数据,然后利用ROS接口发布主题(Topic),供其他节点使用,V4L2是Linux内核提供给应用程序访问音视频驱动的统一接口,用于采集图片、视频和音频数据。
    USB_CAM主要用于ROS环境中,作为连接USB摄像头和ROS系统的桥梁。它负责从摄像头捕获图像或视频数据,并转换为ROS系统可以理解的格式(如sensor_msgs::Image),然后发布到ROS主题上,供其他ROS节点订阅和使用。
    在ROS中使用摄像头的前提是,摄像头在Linux系统下是可识别的,通常来说UVC协议的USB摄像头都可以正常使用,大部分笔记本电脑自带的摄像头都是UVC协议的,所以也可以直接使用。

 

1、安装usb_cam包

    pip install pydantic==1.10.14
     
    sudo apt install ros-humble-usb-cam
     
    # 测试打开相机

### 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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