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本节介绍如何在ROS 2环境中同时配置和使用多个Orbbec摄像头。
要确定摄像头连接到哪些USB端口,您可以使用以下bash脚本。该脚本列出了连接到系统的所有Orbbec设备及其USB端口和序列号。
#!/bin/bash
VID="2bc5"
for dev in /sys/bus/usb/devices/*; do
if [ -e "$dev/idVendor" ]; then
vid=$(cat "$dev/idVendor")
if [ "$vid" == "${VID}" ]; then
port=$(basename $dev)
product=$(cat "$dev/product" 2>/dev/null) # 产品名称
serial=$(cat "$dev/serial" 2>/dev/null) # 序列号
echo "发现Orbbec设备 $product,usb端口 $port,序列号 $serial"
fi
fi
done
将此脚本保存为一个文件,并在您的终端中执行,以输出连接的摄像头列表。
您可以通过为每个摄像头指定不同的USB端口来启动多个摄像头。下面是一个使用ROS 2启动系统启动两个摄像头的Python脚本示例。
from launch import LaunchDescription
from launch.actions import DeclareLaunchArgument, IncludeLaunchDescription, GroupAction, ExecuteProcess
from launch.launch_description_sources import PythonLaunchDescriptionSource
from ament_index_python.packages import get_package_share_directory
import os
def generate_launch_description():
package_dir = get_package_share_directory('orbbec_camera')
launch_file_dir = os.path.join(package_dir, 'launch')
launch1_include = IncludeLaunchDescription(
PythonLaunchDescriptionSource(os.path.join(launch_file_dir, 'gemini_330_series.launch.py')),
launch_arguments={'camera_name': 'camera_01', 'usb_port': '2-3.4.4.4.1', 'device_num': '2', 'sync_mode': 'free_run'}.items()
)
launch2_include = IncludeLaunchDescription(
PythonLaunchDescriptionSource(os.path.join(launch_file_dir, 'gemini_330_series.launch.py')),
launch_arguments={'camera_name': 'camera_02', 'usb_port': '2-3.4.4.4.3', 'device_num': '2', 'sync_mode': 'free_run'}.items()
)
ld = LaunchDescription([
GroupAction([launch1_include]),
GroupAction([launch2_include])
])
return ld
要执行多摄像头的启动配置,请使用命令:
ros2 launch orbbec_camera multi_camera.launch.py
使用多个摄像头时,校准它们并为每个摄像头发布静态TF树是必不可少的。以下Python脚本基于您的校准结果配置TF树:
from launch import LaunchDescription
from launch_ros.actions import Node
def generate_launch_description():
ld = LaunchDescription([
Node(
package='tf2_ros',
executable='static_transform_publisher',
name='camera_01_tf',
arguments=['0', '0', '0', '0', '0', '0', 'base_link', 'camera_01_link'],
output='screen'
),
Node(
package='tf2_ros',
executable='static_transform_publisher',
name='camera_02_tf',
arguments=['0', '0', '0', '0', '0', '0', 'base_link', 'camera_02_link'],
output='screen'
)
])
return ld
将此配置保存为 在Orbbec摄像头包的启动目录中。运行它,请使用:
ros2 launch orbbec_camera multi_camera_tf.launch.py