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LoRD: Local 4D Implicit Representation for High-Fidelity Dynamic Human Modeling

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Computer Vision – ECCV 2022 (ECCV 2022)

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Abstract

Recent progress in 4D implicit representation focuses on globally controlling the shape and motion with low dimensional latent vectors, which is prone to missing surface details and accumulating tracking error. While many deep local representations have shown promising results for 3D shape modeling, their 4D counterpart does not exist yet. In this paper, we fill this blank by proposing a novel Local 4D implicit Representation for Dynamic clothed human, named LoRD, which has the merits of both 4D human modeling and local representation, and enables high-fidelity reconstruction with detailed surface deformations, such as clothing wrinkles. Particularly, our key insight is to encourage the network to learn the latent codes of local part-level representation, capable of explaining the local geometry and temporal deformations. To make the inference at test-time, we first estimate the inner body skeleton motion to track local parts at each time step, and then optimize the latent codes for each part via auto-decoding based on different types of observed data. Extensive experiments demonstrate that the proposed method has strong capability for representing 4D human, and outperforms state-of-the-art methods on practical applications, including 4D reconstruction from sparse points, non-rigid depth fusion, both qualitatively and quantitatively.

B. Jiang, X. Ren and X. Xue are with School of Computer Science, Fudan University. Yanwei Fu is with School of Data Science, Fudan University.

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Acknowledgement

This work was supported by Shanghai Municipal Science and Technology Major Projects (No.2018SHZDZX01, and 2021SHZDZX0103).

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Authors and Affiliations

  1. Fudan University, Shanghai, China

    Boyan Jiang, Xinlin Ren, Xiangyang Xue & Yanwei Fu

  2. Google, California, USA

    Mingsong Dou & Yinda Zhang

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  1. Boyan Jiang
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  2. Xinlin Ren
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  4. Xiangyang Xue
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Correspondence to Yanwei Fu .

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Editors and Affiliations

  1. Tel Aviv University, Tel Aviv, Israel

    Shai Avidan

  2. University College London, London, UK

    Gabriel Brostow

  3. Google AI, Accra, Ghana

    Moustapha Cissé

  4. University of Catania, Catania, Italy

    Giovanni Maria Farinella

  5. Facebook (United States), Menlo Park, CA, USA

    Tal Hassner

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Jiang, B., Ren, X., Dou, M., Xue, X., Fu, Y., Zhang, Y. (2022). LoRD: Local 4D Implicit Representation for High-Fidelity Dynamic Human Modeling. In: Avidan, S., Brostow, G., Cissé, M., Farinella, G.M., Hassner, T. (eds) Computer Vision – ECCV 2022. ECCV 2022. Lecture Notes in Computer Science, vol 13686. Springer, Cham. https://doi.org/10.1007/978-3-031-19809-0_18

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