Stefan Hrabar

About

Stefan Hrabar is a pioneering robotics researcher whose work spans autonomous unmanned aerial vehicles (UAVs), vision-based navigation, and agricultural robotics. His research has made foundational contributions to how robots perceive and navigate complex real-world environments, with a particular focus on rotorcraft UAVs operating in challenging settings such as urban canyons and open fields. Hrabar's most influential work includes developing novel vision-based navigation techniques that combine optic flow and stereo vision to guide UAVs through constrained urban environments, a contribution that has garnered over 200 citations and helped shape the field of aerial autonomy. His research on 3D path planning and stereo-based obstacle avoidance (167 citations) further advanced safe autonomous flight through unknown, obstacle-rich spaces. He also made early contributions to omnidirectional vision systems for helicopters and sensor network deployment via UAVs. Perhaps his most societally impactful work is the Pheno-Copter project (286 citations), which demonstrated how autonomous robotic helicopters could revolutionize high-throughput agricultural phenotyping — dramatically reducing the cost and time of monitoring large plant breeding trials. Across more than a decade of research, Hrabar's cumulative citations exceed 900, reflecting his lasting influence on both aerial robotics and precision agriculture.

Research Focus

Key Achievements

Top Papers

1. 1
   Pheno-Copter: A Low-Altitude, Autonomous Remote-Sensing Robotic Helicopter for High-Throughput Field-Based Phenotyping

   286 citations · 2014
2. 2
   Combined optic-flow and stereo-based navigation of urban canyons for a UAV

   216 citations · 2005
3. 3
   3D path planning and stereo-based obstacle avoidance for rotorcraft UAVs

   167 citations · 2008
4. 4
   Omnidirectional vision for an autonomous helicopter

   87 citations · 2004
5. 5
   Deployment and Connectivity Repair of a Sensor Net with a Flying Robot

   65 citations · 2006
6. 6
   Vision‐based navigation through urban canyons

   49 citations · 2009
7. 7
   Optimum Camera Angle for Optic Flow-Based Centering Response

   20 citations · 2006
8. 8
   High dynamic range stereo vision for outdoor mobile robotics

   19 citations · 2009
9. 9
   Autonomous deployment and repair of a sensor network using an unmanned aerial vehicle

   15 citations · 2004
10. 10
    Reactive obstacle avoidance for Rotorcraft UAVs

    8 citations · 2011

Key Collaborators

Contact & Links