Learning to Optimize Non-Rigid Tracking

• URL: http://arxiv.org/abs/2003.12230v1
• Date: Fri, 27 Mar 2020 04:40:57 GMT
• Title: Learning to Optimize Non-Rigid Tracking
• Authors: Yang Li, Alja\v{z} Bo\v{z}i\v{c}, Tianwei Zhang, Yanli Ji, Tatsuya Harada, Matthias Nie{\ss}ner
• Abstract summary: We employ learnable optimizations to improve robustness and speed up solver convergence. First, we upgrade the tracking objective by integrating an alignment data term on deep features which are learned end-to-end through CNN. Second, we bridge the gap between the preconditioning technique and learning method by introducing a ConditionNet which is trained to generate a preconditioner.
• Score: 54.94145312763044
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: One of the widespread solutions for non-rigid tracking has a nested-loop structure: with Gauss-Newton to minimize a tracking objective in the outer loop, and Preconditioned Conjugate Gradient (PCG) to solve a sparse linear system in the inner loop. In this paper, we employ learnable optimizations to improve tracking robustness and speed up solver convergence. First, we upgrade the tracking objective by integrating an alignment data term on deep features which are learned end-to-end through CNN. The new tracking objective can capture the global deformation which helps Gauss-Newton to jump over local minimum, leading to robust tracking on large non-rigid motions. Second, we bridge the gap between the preconditioning technique and learning method by introducing a ConditionNet which is trained to generate a preconditioner such that PCG can converge within a small number of steps. Experimental results indicate that the proposed learning method converges faster than the original PCG by a large margin.

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