ros2+d435i深度相机测距
时间: 2025-07-07 16:07:23 浏览: 6
在ROS2中使用Intel RealSense D435i深度相机进行距离测量,可以通过以下步骤实现:
### 1. 安装RealSense ROS2驱动
首先需要确保系统中安装了适用于D435i的ROS2驱动。可以使用官方提供的`realsense-ros`包[^1]:
```bash
cd ~/catkin_ws/src
git clone https://github.com/IntelRealSense/realsense-ros.git
cd ..
colcon build --packages-select realsense2_camera
source install/setup.bash
```
### 2. 启动RealSense相机节点
连接好D435i后,启动ROS2节点以获取传感器数据:
```bash
ros2 launch realsense2_camera rs_launch.py
```
此命令将发布包括深度图像在内的多个话题(topics)。
### 3. 获取深度图像数据
运行以下命令查看可用的话题列表:
```bash
ros2 topic list | grep image
```
找到与深度相关的主题(例如 `/camera/depth/image_rect_raw`),然后使用以下命令订阅该主题并查看数据:
```bash
ros2 topic echo /camera/depth/image_rect_raw
```
### 4. 使用OpenCV或PCL计算距离
通过Python脚本订阅深度图像,并利用像素值计算目标距离[^1]:
```python
import rclpy
from rclpy.node import Node
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import numpy as np
class DepthMeasurement(Node):
def __init__(self):
super().__init__('depth_measurement')
self.subscription = self.create_subscription(
Image,
'/camera/depth/image_rect_raw',
self.listener_callback,
10)
self.bridge = CvBridge()
def listener_callback(self, data):
try:
cv_image = self.bridge.imgmsg_to_cv2(data, desired_encoding='passthrough')
center_pixel_value = cv_image[int(cv_image.shape[0]/2), int(cv_image.shape[1]/2)]
distance = center_pixel_value * 0.001 # Convert mm to m
self.get_logger().info(f'Center pixel distance: {distance} meters')
except Exception as e:
self.get_logger().error(f'Error converting image: {e}')
def main(args=None):
rclpy.init()
depth_measurement = DepthMeasurement()
rclpy.spin(depth_measurement)
rclpy.shutdown()
if __name__ == '__main__':
main()
```
### 5. 可视化深度图像
使用`rqt_image_view`插件实时查看深度图像:
```bash
rqt_image_view /camera/depth/image_rect_raw
```
### 6. 校准相机参数
为了提高测距精度,建议对相机进行校准。可以使用`camera_calibration`工具包进行内参和外参标定[^1]。
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