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Enhance usage guide formatting for multi-camera synchronization verification tool
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## 使用教程
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1. **在 `multi_camera_synced.launch.py` 的基础上做以下修改**
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### **在 `multi_camera_synced.launch.py` 的基础上做以下修改**
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- 增加 `launch_include` 以适配 4 台相机
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---
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2. **参数文件修改**
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### **参数文件修改**
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修改 `config` 目录下的以下两个配置文件:
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---
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3. **启动与验证**
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### **启动与验证**
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- 启动多机同步 launch: `multi_camera_synced.launch.py`
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- 打开新终端运行同步验证节点: `ros2 run orbbec_camera image_sync_example_node`
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---
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4. **参考 launch 文件**
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### **参考 launch 文件**
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```
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import os
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## 必要系统配置
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1. **提升 USB 缓冲区容量**
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### **提升 USB 缓冲区容量**
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```
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echo 512 | sudo tee /sys/module/usbcore/parameters/usbfs_memory_mb
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```
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2. **配置 Fast DDS**
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### **配置 Fast DDS**
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优化 ROS2 节点间通信延迟,可以有效减少图像传输延迟,[配置过程见此章节](../performance/fastdds_tuning.md)。
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