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Time Lens++: Event-based Frame Interpolation with Parametric Non-linear Flow and Multi-scale Fusion

Publication date:

  • 2022

Authors:

Stepan Tulyakov
Alfredo Bochicchio
Daniel Gehrig
Stamatios Georgoulis
Yuanyou Li
Davide Scaramuzza

Abstract

Recently, video frame interpolation using a combination of frame- and event-based cameras has surpassed traditional image-based methods both in terms of performance and memory efficiency. However, current methods still suffer from (i) brittle image-level fusion of complementary interpolation results, that fails in the presence of artifacts in the fused image, (ii) potentially temporally inconsistent and inefficient motion estimation procedures, that run for every inserted frame and (iii) low contrast regions that do not trigger events, and thus cause events-only motion estimation to generate artifacts. Moreover, previous methods were only tested on datasets consisting of planar and far-away scenes, which do not capture the full complexity of the real world. In this work, we address the above problems by introducing multi-scale feature-level fusion and computing one-shot non-linear inter-frame motion—which can be efficiently sampled for image warping—from events and images. We also collect the first large-scale events and frames dataset consisting of more than 100 challenging scenes with depth variations, captured with a new experimental setup based on a beamsplitter. We show that our method improves the reconstruction quality by up to 0.2 dB in terms of PSNR and by up to 15% in LPIPS score. Code and dataset will be released upon acceptance.

Reference
Published in: Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR),
 Pages 17755-17764
Read the paper
Version: Published
Access: Open Acccess
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