Authors: Jory Denny, Evan Greco, Shawna L. Thomas, Nancy M. Amato

Venue: 2014 IEEE International Conference on Robotics and Automation (ICRA)
DOI: 10.1109/ICRA.2014.6906594
Link to Publication

Abstract:
Motion planning is a difficult and widely studied problem in robotics. Current research aims not only to find feasible paths, but to ensure paths have certain properties, e.g., shortest or safest paths. This is difficult for current state-of-the-art sampling-based techniques as they typically focus on simply finding any path. Despite this difficulty, sampling-based techniques have shown great success in planning for a wide range of applications. Among such planners, Rapidly-Exploring Random Trees (RRTs) search the planning space by biasing exploration toward unexplored regions. This paper introduces a novel RRT variant, Medial Axis RRT (MARRT), which biases tree exploration to the medial axis of free space by pushing all configurations from expansion steps towards the medial axis. We prove that this biasing increases the tree's clearance from obstacles. Improving obstacle clearance is useful where path safety is important, e.g., path planning for robots performing tasks in close proximity to the elderly. Finally, we experimentally analyze MARRT, emphasizing its ability to effectively map difficult passages while increasing obstacle clearance, and compare it to contemporary RRT techniques. 

@inproceedings{Denny-mmabrr-2014, 
 author = {J. {Denny} and E. {Greco} and S. {Thomas} and N. M. {Amato}}, 
 booktitle = {2014 IEEE International Conference on Robotics and Automation (ICRA)}, 
 doi = {10.1109/ICRA.2014.6906594}, 
 number = {}, 
 pages = {90-97}, 
 title = {MARRT: Medial Axis biased rapidly-exploring random trees}, 
 volume = {}, 
 year = {2014} 
}