• Jul. 2023: Patent granted by the USPTO! [ link ]
• Mai.2023: SSP-Net accepted to Pattern Recognition.
• Mar.2023: One paper accepted to CVPR 2023.
• Feb.2023: One paper accepted to EUROGRAPHICS 2023.

• Computer Vision & Computer Graphics
• Human Pose Estimation and Action Recognition
• 3D Scene Understanding

SSP-Net: Scalable Sequential Pyramid Networks for Real-time 3D Human Pose Regression D. Luvizon, H. Tabia, D. Picard Pattern Recognition, Volume 142, Oct. 2023 Description: In this paper, we propose a highly scalable convolutional neural network (SSP-Net) for real-time 3D human pose regression from a single image. The SSP-Net is trained with refined supervision at multiple scales in a sequential manner. Our network requires a single training procedure and is capable of producing its best predictions at 120 frames per second (FPS), or acceptable predictions at more than 200 FPS when cut at test time. We show that the proposed regression approach is invariant to the size of feature maps, allowing our method to perform multi-resolution intermediate supervisions. [paper] [arXiv]

Scene-aware Egocentric 3D Human Pose Estimation J. Wang, D. Luvizon, W. Xu, L. Liu, K. Sarkar, and C. Theobalt To appear in CVPR 2023. Description: In this work, we propose to estimate egocentric human pose guided by scene constraints. We devise a new egocentric scene depth estimation network from a wide-view egocentric fisheye camera that estimates the depth behind the human with a depth-inpainting network. Our pose estimation model projects 2D image features and estimated scene depth into a common voxel space and regresses the 3D pose with a V2V network. We also generated a synthetic dataset, EgoGTA, and an in-the-wild dataset based on EgoPW, EgoPW-Scene. [paper] [IEEE/CVF] [arXiv] [project page] [code]

Scene-Aware 3D Multi-Human Motion Capture from a Single Camera D. Luvizon, M. Habermann, V. Golyanik, A. Kortylewski and C. Theobalt Eurographics 2023. Description: We introduce the first non-linear optimization-based approach that jointly solves for the absolute 3D position of each human, their articulated pose, their individual shapes as well as the scale of the scene. Given the per-frame 3D estimates of the humans and scene point-cloud, we perform a space-time coherent optimization over the video to ensure temporal, spatial and physical plausibility. We consistently outperform previous methods and we qualitatively demonstrate that our method is robust to in-the-wild conditions including challenging scenes with people of different sizes. [arXiv] [project page] [source code]

HandFlow: Quantifying View-Dependent 3D Ambiguity in Two-Hand Reconstruction with Normalizing Flow J. Wang, D. Luvizon, F. Mueller, F. Bernard, A. Kortylewski, D. Casas, C. Theobalt VMV 2022, Best Paper Honorable Mention Description: This work presents the first probabilistic method to estimate a distribution of plausible two-hand poses given a monocular RGB input. It quantitatively shows that existing deterministic methods are not suited for this ambiguous task. In this work, we demonstrate the quality of our probabilistic reconstruction and show that explicit ambiguity modeling is better-suited for this challenging problem [arXiv] [project page]

Estimating Egocentric 3D Human Pose in the Wild with External Weak Supervision J. Wang, L. Liu, W. Xu, K. Sarkar, D. Luvizon, C. Theobalt CVPR 2022 Description: We present a new egocentric pose estimation method that can be trained with weak external supervision. To facilitate the network training, we propose a novel learning strategy to supervise the egocentric features with high-quality features extracted by a pretrained external-view pose estimation model. We also collected a large-scale in-the-wild egocentric dataset called Egocentric Poses in the Wild (EgoPW) with a head-mounted fisheye camera and an auxiliary external camera, which provides additional observation of the human body from a third-person perspective. [paper] [arXiv] [project page] [data]

Adaptive multiplane image generation from a single internet picture Diogo C. Luvizon, Gustavo Sutter P Carvalho, Andreza A. dos Santos, Jhonatas S. Conceicao, Jose L. Flores-Campana, Luis G.L. Decker, Marcos R. Souza, Helio Pedrini, Antonio Joia, Otavio A.B. Penatti WACV 2021, CVPR 2021 Workshop Learning to Generate 3D Shapes and Scenes Description: In this paper, we address the problem of generating an efficient multiplane image (MPI) from a single high-resolution picture. We present the adaptive-MPI representation, which allows rendering novel views with low computational requirements. To this end, we propose an adaptive slicing algorithm that produces an MPI with variable number of image planes. We also present a new lightweight CNN for depth estimation, which is learned by knowledge distillation from a larger network. Occluded regions in the adaptive-MPI are inpainted also by a lightweight CNN.Our method is capable of producing high-quality predictions with one order of magnitude less parameters, when compared to previous approaches. [paper] [arXiv] [CVPRW'21 link]

• 2021 - current: Postdoctoral Researcher at MPI-INF VCAI
• 2019 - 2021: Research Scientist at Samsung SRBR
• 2011 - 2014: Electronic Engineer at Ensitec Tecnologia

• 2015 - 2019: PhD Student at ETIS / Cergy-Paris Université (France), Individual Grant 233342/2014-1 CNPq
• 2013 - 2015: MSc Degree in Applied Computing & Computer Vision, UTFPR/DAINF (Brazil)
• 2007 - 2011: BSc Degree in Electronics Engineering, UTFPR (Brazil)

Master (ENSEA - France) 2017-2019

UEC-1-IMD Int. images et multimedia

• Action recognition from skeletons, VLAD, and LMNN: slides
• Intro. to Neural Networks and Deep Learning: slides
• Intro. to Generative Adversarial Networks: slides
• IA et Big Data: TP GANs 2018-2019 link