Рет қаралды 12,831
State-of-the-art frame interpolation methods generate intermediate frames by inferring object motions in the image from consecutive key-frames. In the absence of additional information, first-order approximations, i.e. optical flow, must be used, but this choice restricts the types of motions that can be modeled, leading to errors in highly dynamic scenarios. Event cameras are novel sensors that address this limitation by providing auxiliary visual information in the blind-time between frames. They asynchronously measure per-pixel brightness changes and do this with high temporal resolution and low latency. Event-based frame interpolation methods typically adopt a synthesis-based approach, where predicted frame residuals are directly applied to the key-frames. However, while these approaches can capture non-linear motions they suffer from ghosting and perform poorly in low-texture regions with few events. Thus, synthesis-based and flow-based approaches are complementary. In this work, we introduce Time Lens, a novel indicates equal contribution method that leverages the advantages of both. We extensively evaluate our method on three synthetic and two real benchmarks where we show an up to 5.21 dB improvement in terms of PSNR over state-of-the-art frame-based and event-based methods. Finally, we release a new large-scale dataset in highly dynamic scenarios, aimed at pushing the limits of existing methods.
Reference:
Stepan Tulyakov*, Daniel Gehrig*, Stamatios Georgoulis, Julius Erbach, Mathias Gehrig, Yuanyou Li, Davide Scaramuzza.
TimeLens: Event-based Video Frame Interpolation
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), Nashville, 2021
PDF: rpg.ifi.uzh.ch/docs/CVPR21_Geh...
Webpage: rpg.ifi.uzh.ch/timelens
Code and Datasets: github.com/uzh-rpg/rpg_timelens
Slides: rpg.ifi.uzh.ch/timelens/slides...
Our research page on event based vision: rpg.ifi.uzh.ch/research_dvs.html
For event-camera datasets, see here:
rpg.ifi.uzh.ch/davis_data.html
and here: github.com/uzh-rpg/event-base...
For an event camera simulator: rpg.ifi.uzh.ch/esim/index.html
For a survey paper on event cameras, see here:
rpg.ifi.uzh.ch/docs/EventVisio...
Other resources on event cameras (publications, software, drivers, where to buy, etc.):
github.com/uzh-rpg/event-base...
Affiliation:
D. Gehrig, M. Gehrig, and D. Scaramuzza are with the Robotics and Perception Group, Dept. of Informatics, University of Zurich, and Dept. of Neuroinformatics, University of Zurich and ETH Zurich, Switzerland rpg.ifi.uzh.ch/
Stepan Tulyakov, Stamatios Georgoulis, Julius Erbach and Yuanyou Li are with Huawei Zurich Research Center.