Robust global translation averaging with feature tracks
Hainan Cui, Shuhan Shen, Zhanyi Hu · 2016
How to average translations is the single most difficult task in global structure-from-motion (SfM) to fully tap its potentials in terms of reconstruction efficiency and accuracy since usually only noisy translation directions can be factored out from essential matrices due to the inevitable matching outliers. To tackle this problem, this work proposes a two-step strategy. Firstly, a “2-point method” is introduced to refine the epipolar geometry by which a more accurate track set is generated. Then, translation lengths are computed by solving a convex L1 optimization according to the adjacent triangles induced by the selected tracks and translations. Extensive experiments show that our method performs similarly or better than the state-of-art SfM approaches in terms of the reconstruction accuracy, completeness and efficiency.