Title

Non-smooth M-estimator for maximum consensus estimation

Document Type

Conference Proceeding

Publisher

BMVA Press

School

School of Science

Funders

Australian Research Council

Grant Number

ARC Number : FT170100072, ARC Number : FT140101229, ARC Number : DP160103490

Comments

Originally published as: Le, H., Eriksson, A., Milford, M., Do, T. T., Chin, T. J., & Suter, D. (2018). Non-smooth M-estimator for maximum consensus estimation supplementary material. In British Machine Vision Conference 2018. Newcastle, United Kingdom: Northumbria University. Original publication available here

Abstract

This paper revisits the application of M-estimators for a spectrum of robust estimation problems in computer vision, particularly with the maximum consensus criterion. Current practice makes use of smooth robust loss functions, e.g. Huber loss, which enables M-estimators to be tackled by such well-known optimization techniques as Iteratively Re-weighted Least Square (IRLS). When consensus maximization is used as loss function for M-estimators, however, the optimization problem becomes non-smooth. Our paper proposes an approach to resolve this issue. Based on the Alternating Direction Method of Multiplier (ADMM) technique, we develop a deterministic algorithm that is provably convergent, which enables the maximum consensus problem to be solved in the context of M-estimator. We further show that our algorithm outperforms other differentiable robust loss functions that are currently used by many practitioners. Notably, the proposed method allows the sub-problems to be solved efficiently in parallel, thus entails it to be implemented in distributed settings.

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