• 中国计算机学会会刊
  • 中国科技核心期刊
  • 中文核心期刊

计算机工程与科学

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基于姿态阈值滤波的单目视觉农业机械定位方法

黄沛琛1,2,罗锡文1,2,张智刚1,2,刘兆朋1,2   

  1. (1.华南农业大学工程学院,广东 广州 510642;
    2.华南农业大学南方农业机械与装备关键技术教育部重点实验室,广东 广州 510642)

     
  • 收稿日期:2015-11-26 修回日期:2016-04-22 出版日期:2018-01-25 发布日期:2018-01-25
  • 基金资助:

    “十二五” 国家科技支撑计划(2011BAD20B06)

Monocular vision agricultural machine
localization based on pose threshold filter
 

HUANG Pei-chen1,2,LUO Xi-wen 1,2,ZHANG Zhi-gang 1,2,LIU Zhao-peng 1,2   

  1. (1.College of Engineering,South China Agricultural University,Guangzhou 510642;
    2.Key Laboratory of Key Technology on Agricultural Machine and Equipment,
    Ministry of Education,South China Agricultural University,Guangzhou 510642,China)
  • Received:2015-11-26 Revised:2016-04-22 Online:2018-01-25 Published:2018-01-25

摘要:

精确定位是农业机械实现自动导航的重要前提,提出了一种基于单目摄像机的导航定位算法。算法通过对捕获的每帧图像进行特征点检测与跟踪,基于3D-2D特征点配对方法,还原了车辆行驶过程中的姿态信息。同时,假设车辆前方小区域近似平坦,摄像机离地高度近似固定不变,算法实时求解车辆位移的绝对尺度因子,配合姿态阈值滤波器,对所求姿态信息进行在线修正。实验选择在三种不同的场景进行,以RTK-GPS定位数据作为对比,三种场景的平均相对位置偏差分别为5.459 9%、8.373 1%、6.443 94%,三种不同场景的航向角变化平均值分别为7.717 7°、5.738 9°、3.438 3°。结果表明算法可实现农业机械的自动定位,在短距离范围内具有一定的可靠性。

关键词: 定位, 机器视觉, 农业机械, 阈值滤波

Abstract:

Precise localization is an important premise of autonomous navigation for agricultural vehicles. We propose a localization algorithm based on monocular camera. After features are detected and tracked through multiple frames, vehicle poses are estimated based on 3D-2D correspondences. Furthermore, the translation absolute scale is calculated based on the assumption that the ground patches are locally flat and the camera is moving at a known and fixed height over the ground. Finally, the poses are refined by the pose threshold filter. Compared with the RTK-GPS data, the average relative position errors of the three different experimental terrains are 5.459 9%, 8.373 1% and 6.443 94%, and the average heading errors are 7.717 7°, 5.738 9° and 3.438 3°. The results show that the algorithm is feasible for agricultural vehicles localization.
 

Key words: localization, machine vision, agricultural machine, threshold filter