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David Combs

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2 papers
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2

IROS Conference 2023 Conference Paper

Vision-Based Vineyard Navigation Solution with Automatic Annotation

  • Ertai Liu
  • Josephine Monica
  • Kaitlin M. Gold
  • Lance Cadle-Davidson
  • David Combs
  • Yu Jiang

Autonomous navigation is crucial for achieving the full automation of agricultural research and production management using agricultural robots. In this paper, we present a vision-based autonomous navigation approach for agriculture robots in trellised cropping systems, which stands out for its remarkable performance achieved entirely without human annotation. We propose a novel learning-based method that directly estimates the path traversibility heatmap from an RGB-D image and subsequently converts it into a preferred traversal path. One key advantage of our approach lies in its capability to predict the robot's preferred path directly, allowing us to obtain training labels without manual annotation. Specifically, we propose an automatic annotation pipeline that leverages the robot's path recorded during data collection. Furthermore, we develop a full navigation framework by integrating our path detection model with row switching modules, enabling the robot to smoothly transition between crop rows within the vineyard. We conduct extensive field trials in three different vineyards to validate the performance of our autonomous navigation framework. The results demonstrate that our approach provides a cost-effective, accurate, and robust solution for vineyard navigation.

IROS Conference 2022 Conference Paper

Near Real-Time Vineyard Downy Mildew Detection and Severity Estimation

  • Ertai Liu
  • Kaitlin M. Gold
  • Lance Cadle-Davidson
  • David Combs
  • Yu Jiang

The global grape and wine industry has been considerably impacted by diseases such as downy mildew (DM). Agricultural robots have demonstrated great potential to accurately and rapidly map DM infection for precision applications. Although the robots can autonomously acquire high-resolution images in the vineyard, data processing is mostly performed offline because of network infrastructure and onboard computing power constraints, limiting the use of agricultural robots for field operations. To address this issue, we developed a semantic segmentation model based on the modified DeepLabv3 network for near real time DM segmentation in high resolution images. Compared with state-of-the-art real time semantic segmentation models, the developed one achieved the best efficiency-accuracy balance on the DM dataset using embedded computing devices that can be easily integrated with commercial robotic platforms. DM severity estimation pipeline based on the model also showed a comparable measurement accuracy and statistical power in differentiation of fungicide treatments as the one based on offline semantic segmentation models. This enables the use of robotic perception systems for field operations.

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