using-aruco_ros.md

description
Using the ArUco ROS package.

ArUco ROS

Calibrate the camera first:

{% content-ref url="camera-calibration.md" %} camera-calibration.md {% endcontent-ref %}

There are three launch files:

double.launch # to detect multiple markers
marker_publisher.launch
single.launch # to detect a single marker​

For single.launch, use the following code:

​<launch>

    <arg name="markerId"        default="582"/>
    <arg name="markerSize"      default="0.034"/>    <!-- in m -->
    <arg name="eye"             default="left"/>
    <arg name="marker_frame"    default="aruco_marker_frame"/>
    <arg name="ref_frame"       default=""/>  <!-- leave empty and the pose will be published wrt param parent_name -->
    <arg name="corner_refinement" default="LINES" /> <!-- NONE, HARRIS, LINES, SUBPIX -->


    <node pkg="aruco_ros" type="single" name="aruco_single">
        <remap from="/camera_info" to="/stereo/$(arg eye)/camera_info" />
        <remap from="/image" to="/stereo/$(arg eye)/image_rect_color" />
        <param name="image_is_rectified" value="True"/>
        <param name="marker_size"        value="$(arg markerSize)"/>
        <param name="marker_id"          value="$(arg markerId)"/>
        <param name="reference_frame"    value="$(arg ref_frame)"/>   <!-- frame in which the marker pose will be refered -->
        <param name="camera_frame"       value="stereo_gazebo_$(arg eye)_camera_optical_frame"/>
        <param name="marker_frame"       value="$(arg marker_frame)" />
        <param name="corner_refinement"  value="$(arg corner_refinement)" />
    </node>

</launch>

camera_info needs your calibration parameters

image needs image from the camera, the topic should probably be \usb_cam\image_raw

-> Download markers from here​.

{% hint style="info" %} Points to note:

1. /camera_info needs to get calibration parameters
2. /image needs image input from the camera, the topic to subscribe to should probably be \usb_cam\image_raw {% endhint %}

-> Launch using roslaunch aruco_ros single.launch