Rotation Averaging and Strong Duality
Paper i proceeding, 2018

In this paper we explore the role of duality principles within the problem of rotation averaging, a fundamental task in a wide range of computer vision applications. In its conventional form, rotation averaging is stated as a minimization over multiple rotation constraints. As these constraints are non-convex, this problem is generally considered challenging to solve globally. We show how to circumvent this difficulty through the use of Lagrangian duality. While such an approach is well-known it is normally not guaranteed to provide a tight relaxation. Based on spectral graph theory, we analytically prove that in many cases there is no duality gap unless the noise levels are severe. This allows us to obtain certifiably global solutions to a class of important non-convex problems in polynomial time.

We also propose an efficient, scalable algorithm that out-performs general purpose numerical solvers and is able to handle the large problem instances commonly occurring in structure from motion settings. The potential of this proposed method is demonstrated on a number of different problems, consisting of both synthetic and real-world data.


Anders Eriksson

Queensland University of Technology (QUT)

Carl Olsson

Lunds universitet

Chalmers, Elektroteknik, Signalbehandling och medicinsk teknik

Fredrik Kahl

Chalmers, Elektroteknik, Signalbehandling och medicinsk teknik

Lunds universitet

Tat-Jun Chin

University of Adelaide

Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition

10636919 (ISSN)

127-135 8578119
978-1-5386-6420-9 (ISBN)

IEEE Conference on Computer Vision and Pattern Recognition
Salt Lake City, UT, USA,


VINNOVA (2017-01942), 2017-06-01 -- 2019-11-30.

Integrering av geometri och semantik i datorseende

Vetenskapsrådet (VR) (2016-04445), 2017-01-01 -- 2020-12-31.

Semantisk kartering & visuell navigering för smarta robotar

Stiftelsen för Strategisk forskning (SSF) (RIT15-0038), 2016-05-01 -- 2021-06-30.



Datorseende och robotik (autonoma system)

Matematisk analys



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