Cited by 56Advanced Vision and ImagingAdvanced Image Processing TechniquesVideo Surveillance and Tracking Methods

High Speed and High Dynamic Range Video with an Event Camera

Open access
Rebecq, Henri, Ranftl, Rene, Koltun, Vladlen, Scaramuzza, Davide·2021·IEEE Transactions on Pattern Analysis and Machine Intelligence

Abstract

Event cameras are novel sensors that report brightness changes in the form of a stream of asynchronous "events" instead of intensity frames. They offer significant advantages with respect to conventional cameras: high temporal resolution, high dynamic range, and no motion blur. While the stream of events encodes in principle the complete visual signal, the reconstruction of an intensity image from a stream of events is an ill-posed problem in practice. Existing reconstruction approaches are based on hand-crafted priors and strong assumptions about the imaging process as well as the statistics of natural images. In this work we propose to learn to reconstruct intensity images from event streams directly from data instead of relying on any hand-crafted priors. We propose a novel recurrent network to reconstruct videos from a stream of events, and train it on a large amount of simulated event data. During training we propose to use a perceptual loss to encourage reconstructions to follow natural image statistics. We further extend our approach to synthesize color images from color event streams. Our quantitative experiments show that our network surpasses state-of-the-art reconstruction methods by a large margin in terms of image quality ( ), while comfortably running in real-time. We show that the network is able to synthesize high framerate videos ( frames per second) of high-speed phenomena (e.g., a bullet hitting an object) and is able to provide high dynamic range reconstructions in challenging lighting conditions. As an additional contribution, we demonstrate the effectiveness of our reconstructions as an intermediate representation for event data. We show that off-the-shelf computer vision algorithms can be applied to our reconstructions for tasks such as object classification and visual-inertial odometry and that this strategy consistently outperforms algorithms that were specifically designed for event data. We release the reconstruction code, a pre-trained model and the datasets to enable further research.

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Crossref · 10.1109/tpami.2019.2963386

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  • The event-to-image model [8] reconstructs a detailed image that reveals personal identity information.

    “As illustrated in Figure 1(a), event-toimage [8] model reconstruct a detailed image that reveals personal identity information; consequently, this implies that event cameras can no longer be deemed inherently privacypreserving.”

    From Event Anonymization: Privacy-Preserving Person Re-Identification and Pose Estimation in Event-Based Vision (2024) · cites this paper as [8]

    The Introduction (p. 2) says the model reconstructs high-quality images from event data, and §5.2 (p. 8) reports reconstructing an entire scene in a selfie sequence. Our copy does not establish that the reconstructed image reveals personal identity information; that is an additional inference, not a finding the paper reports. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Event cameras can no longer be deemed inherently privacy-preserving.

    “As illustrated in Figure 1(a), event-toimage [8] model reconstruct a detailed image that reveals personal identity information; consequently, this implies that event cameras can no longer be deemed inherently privacypreserving.”

    From Event Anonymization: Privacy-Preserving Person Re-Identification and Pose Estimation in Event-Based Vision (2024) · cites this paper as [8]

    The Evaluation (p. 6) reports detailed image reconstructions, and Section 5.2 (p. 8) describes reconstructing an entire scene from a selfie sequence. The paper does not establish that the images reveal personal identity information or assess whether event cameras are privacy-preserving; those are the citing authors’ inferences. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • E2VID translates a continuous stream of events into a sequence of images.

    “E2VID translates a continuous stream of events into a sequence of images.”

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Research works printed but not linked: 3

  1. [22][22] A. Z. Zhu, L. Yuan, K. Chaney, and K. Daniilidis, 'Unsupervised eventbased optical flow using motion compensation,' in Eur. Conf. Comput. Vis. Workshops (ECCVW) , 2018. -
  2. [25][25] C. Brandli, R. Berner, M. Yang, S.-C. Liu, and T. Delbruck, 'A 240x180 130dB 3us latency global shutter spatiotemporal vision sensor,' IEEE J. Solid-State Circuits , vol. 49, no. 10, pp. 2333-2341, 2014. -
  3. [41][41] B. Son, Y. Suh, S. Kim, H. Jung, J.-S. Kim, C. Shin, K. Park, K. Lee, J. Park, J. Woo, Y. Roh, H. Lee, Y. Wang, I. Ovsiannikov, and H. Ryu, 'A 640x480 dynamic vision sensor with a 9um pixel and 300Meps addressevent representation,' in IEEE Intl. Solid-State Circuits Conf. (ISSCC) , 2017. -

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Authors
Rebecq, H., Ranftl, R., Koltun, V., & Scaramuzza, D.
Affiliations
  • University of Zurich (CH)
  • Intel (United States) (US)
Venue
IEEE Transactions on Pattern Analysis and Machine Intelligence
Published
2021-06-01
Volume
43
Issue
6
Pages
1964-1980
ISSN
  • 0162-8828 (ISSN-L)
  • 2160-9292
  • 1939-3539
OpenAlex
W2952699404
Cited by
50
References
68
Citations by year
2026: 2 · 2025: 8 · 2024: 11 · 2023: 11 · 2022: 3 · 2021: 10 · 2020: 5
FWCI
2.12
Type
journal article
Language
en
Open access
Locations
  • IEEE Transactions on Pattern Analysis and Machine Intelligence (publishedVersion)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
  • Zurich Open Repository and Archive (University of Zurich)
  • TIB Data Manager
Funders
  • Swiss National Center of Competence Research Robotics
  • SNSF-ERC
  • Qualcomm
Topics
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Vision and Imaging
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Image Processing Techniques
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Video Surveillance and Tracking Methods
Keywords
event cameras, video reconstruction, recurrent neural networks, perceptual loss, natural image statistics, high-speed video, high dynamic range imaging, visual-inertial odometry, object classification

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