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  • ROS之USB摄像头识别二维码问题解决

    出现错误如下:

    ERROR: cannot launch node of type [ar_track_alvar/individualMarkersNoKinect]: Cann
    ot locate node of type [individualMarkersNoKinect] in package [ar_track_alvar]. Ma
    ke sure file exists in package path and permission is set to executable (chmod +x)

    zztsj@tsj:~$ roslaunch robot_vision ar_track_camera.launch 
    ... logging to /home/zztsj/.ros/log/8c04e9b8-4cca-11eb-9d65-9822efa1466f/roslaunch-tsj-4103.log
    Checking log directory for disk usage. This may take a while.
    Press Ctrl-C to interrupt
    Done checking log file disk usage. Usage is <1GB.
    
    started roslaunch server http://localhost:42405/
    
    SUMMARY
    ========
    
    PARAMETERS
     * /ar_track_alvar/marker_size: 3.0
     * /ar_track_alvar/max_new_marker_error: 0.08
     * /ar_track_alvar/max_track_error: 0.2
     * /ar_track_alvar/output_frame: /usb_cam
     * /rosdistro: melodic
     * /rosversion: 1.14.10
    
    NODES
      /
        ar_track_alvar (ar_track_alvar/individualMarkersNoKinect)
        rviz (rviz/rviz)
        world_to_cam (tf/static_transform_publisher)
    
    ROS_MASTER_URI=http://localhost:11311
    
    process[world_to_cam-1]: started with pid [4118]
    ERROR: cannot launch node of type [ar_track_alvar/individualMarkersNoKinect]: Cannot locate node of type [individualMarkersNoKinect] in package [ar_track_alvar]. Make sure file exists in package path and permission is set to executable (chmod +x)

    出现上面错误的原因是在自己的工作空间中有同名的包

    解决方法

    在工作空间下输入以下指令,找到同名包的位置

    catkin_find --without-underlays --libexec --share ar_track_alvar

    会显示如下

    zztsj@tsj:~$ catkin_find --without-underlays --libexec --share ar_track_alvar
    /home/zztsj/catkin_ws/devel/lib/ar_track_alvar
    /home/zztsj/catkin_ws/devel/share/ar_track_alvar

    会有两个同名的包,然后进入相应的目录下,删除这两个包

    如下:

    zztsj@tsj:~$ cd catkin_ws/devel/lib/
    zztsj@tsj:~/catkin_ws/devel/lib$ rm -rf ar_track_alvar/
    
    zztsj@tsj:~$ cd catkin_ws/devel/share/
    zztsj@tsj:~/catkin_ws/devel/share$ rm -rf ar_track_alvar
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  • 原文地址:https://www.cnblogs.com/tanshengjiang/p/14223360.html
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