Large-scale, real-time visual–inertial localization revisited
Artikel i vetenskaplig tidskrift, 2020

The overarching goals in image-based localization are scale, robustness, and speed. In recent years, approaches based on local features and sparse 3D point-cloud models have both dominated the benchmarks and seen successful real-world deployment. They enable applications ranging from robot navigation, autonomous driving, virtual and augmented reality to device geo-localization. Recently, end-to-end learned localization approaches have been proposed which show promising results on small-scale datasets. However, the positioning accuracy, scalability, latency, and compute and storage requirements of these approaches remain open challenges. We aim to deploy localization at a global scale where one thus relies on methods using local features and sparse 3D models. Our approach spans from offline model building to real-time client-side pose fusion. The system compresses the appearance and geometry of the scene for efficient model storage and lookup leading to scalability beyond what has been demonstrated previously. It allows for low-latency localization queries and efficient fusion to be run in real-time on mobile platforms by combining server-side localization with real-time visual–inertial-based camera pose tracking. In order to further improve efficiency, we leverage a combination of priors, nearest-neighbor search, geometric match culling, and a cascaded pose candidate refinement step. This combination outperforms previous approaches when working with large-scale models and allows deployment at unprecedented scale. We demonstrate the effectiveness of our approach on a proof-of-concept system localizing 2.5 million images against models from four cities in different regions of the world achieving query latencies in the 200 ms range.

Localization

sensor fusion

visual tracking

Författare

Simon Lynen

Eidgenössische Technische Hochschule Zürich (ETH)

Google Switzerland GmbH

Bernhard Zeisl

Google Switzerland GmbH

Dror Aiger

Google LLC, Africa & Middle East

Michael Bosse

Microsoft Research

Eidgenössische Technische Hochschule Zürich (ETH)

Joel Hesch

Eidgenössische Technische Hochschule Zürich (ETH)

Microsoft Research

Marc Pollefeys

Eidgenössische Technische Hochschule Zürich (ETH)

Microsoft Research

Roland Siegwart

Eidgenössische Technische Hochschule Zürich (ETH)

Torsten Sattler

Chalmers, Elektroteknik, Signalbehandling och medicinsk teknik, Digitala bildsystem och bildanalys

International Journal of Robotics Research

0278-3649 (ISSN)

Vol. In Press

Ämneskategorier

Robotteknik och automation

Datorsystem

Datorseende och robotik (autonoma system)

DOI

10.1177/0278364920931151

Mer information

Senast uppdaterat

2020-08-17