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Nathan Hughes

6 accepted papers

2024

Clio: Real-Time Task-Driven Open-Set 3D Scene Graphs

RA-L 2024

Modern tools for class-agnostic image segmentation (e.g., SegmentAnything) and open-set semantic understanding (e.g., CLIP) provide unprecedented opportunities for robot perception and mapping. While traditional closed-set metric-semantic maps were restricted to tens or hundreds of semantic classes,

Cited by 94SourcecodeScholar
2024

Indoor and Outdoor 3D Scene Graph Generation Via Language-Enabled Spatial Ontologies

RA-L 2024

This paper proposes an approach to build 3D scene graphs in arbitrary indoor and outdoor environments. Such extension is challenging; the hierarchy of concepts that describe an outdoor environment is more complex than for indoors, and manually defining such hierarchy is time-consuming and does not s

Cited by 46SourceScholar
2023

Hydra-Multi: Collaborative Online Construction of 3D Scene Graphs with Multi-Robot Teams

IROS 2023poster

3D scene graphs have recently emerged as an expressive high-level map representation that describes a 3D environment as a layered graph where nodes represent spatial concepts at multiple levels of abstraction (e.g., objects, rooms, buildings) and edges represent relations between concepts (e.g., inc…

Cited by 23SourceScholar
2022

Hierarchical Representations and Explicit Memory: Learning Effective Navigation Policies on 3D Scene Graphs using Graph Neural Networks

ICRA 2022poster

Representations are crucial for a robot to learn effective navigation policies. Recent work has shown that mid-level perceptual abstractions, such as depth estimates or 2D semantic segmentation, lead to more effective policies when provided as observations in place of raw sensor data (e.g., RGB imag…

Cited by 88SourcecodeScholar
2022

Hydra: A Real-time Spatial Perception System for 3D Scene Graph Construction and Optimization

RSS 2022poster

3D scene graphs have recently emerged as a powerful high-level representation of 3D environments. A 3D scene graph models the environment as a layered graph where nodes represent spatial concepts at multiple levels of abstraction (from low-level geometry to high-level semantics including objects, pl…

2021

Dynamic Grasping with a "Soft" Drone: From Theory to Practice

IROS 2021poster

Rigid grippers used in existing aerial manipulators require precise positioning to achieve successful grasps and transmit large contact forces that may destabilize the drone. This limits the speed during grasping and prevents "dynamic grasping", where the drone attempts to grasp an object while movi…

Cited by 91SourceScholar