Papers
Topics
Authors
Recent
Gemini 2.5 Flash
Gemini 2.5 Flash
125 tokens/sec
GPT-4o
53 tokens/sec
Gemini 2.5 Pro Pro
42 tokens/sec
o3 Pro
4 tokens/sec
GPT-4.1 Pro
47 tokens/sec
DeepSeek R1 via Azure Pro
28 tokens/sec
2000 character limit reached

H-NeRF: Neural Radiance Fields for Rendering and Temporal Reconstruction of Humans in Motion (2110.13746v2)

Published 26 Oct 2021 in cs.CV

Abstract: We present neural radiance fields for rendering and temporal (4D) reconstruction of humans in motion (H-NeRF), as captured by a sparse set of cameras or even from a monocular video. Our approach combines ideas from neural scene representation, novel-view synthesis, and implicit statistical geometric human representations, coupled using novel loss functions. Instead of learning a radiance field with a uniform occupancy prior, we constrain it by a structured implicit human body model, represented using signed distance functions. This allows us to robustly fuse information from sparse views and generalize well beyond the poses or views observed in training. Moreover, we apply geometric constraints to co-learn the structure of the observed subject -- including both body and clothing -- and to regularize the radiance field to geometrically plausible solutions. Extensive experiments on multiple datasets demonstrate the robustness and the accuracy of our approach, its generalization capabilities significantly outside a small training set of poses and views, and statistical extrapolation beyond the observed shape.

Citations (171)

Summary

  • The paper presents a novel framework that combines neural radiance fields with an implicit human model to enable realistic free-viewpoint rendering.
  • It co-learns a radiance field and a residual signed distance function to accurately capture complex human geometry, including hair and clothing.
  • Experiments demonstrate significant improvements in 3D reconstruction and novel-view synthesis, highlighting potential for immersive 3D applications.

Overview of H-NeRF: Neural Radiance Fields for Rendering and Temporal Reconstruction of Humans in Motion

The paper presents a sophisticated framework, named H-NeRF, which integrates neural radiance fields (NeRF) with an implicit statistical geometric human model. The central aim is to facilitate realistic free-viewpoint rendering and 4D reconstruction of dynamic human subjects using sparse camera data, or even monocular videos. This work addresses the challenges posed by dynamic scenes, such as limited viewpoints and the changing geometry and appearance of subjects over time.

Methodology and Approach

H-NeRF combines principles from novel-view synthesis and neural scene representation to enhance the coherence and realism of dynamic human modeling. The methodology relies on a structured implicit human body model using signed distance functions (SDFs), with the imGHUM model serving as a robust prior for geometry. By incorporating geometric constraints enabled by imGHUM, the approach achieves regularization of the radiance field, leading to geometrically plausible reconstructions.

The framework involves the co-learning of a radiance field and a residual SDF to model detailed subject geometry, including hair and clothing, which are not represented explicitly by the body model. By conditioning the framework on latent shape and pose codes, the model can render subjects in novel poses and shapes beyond those seen during training. H-NeRF's architecture supports both accurate 3D reconstruction and photo-realistic free-viewpoint rendering, capturing dynamic human motions with a high level of detail and generalization.

Experimental Results

Extensive experiments were conducted to assess the robustness, accuracy, and generalization capabilities of H-NeRF. The quantitative evaluation demonstrated marked improvements over existing methods, both in terms of novel-view synthesis and geometric reconstruction under sparse training conditions. Importantly, the paper shows the model's ability to handle complex human motions and to extrapolate poses and shapes beyond the training data. The imGHUM model's incorporation provides H-NeRF with significant advantages in structuring and regularizing radiance fields, yielding models that generalize well to unseen poses and views.

Implications and Future Directions

The implications of H-NeRF are far-reaching, with significant potential contributions to immersive 3D content applications such as virtual reality, augmented reality, and human performance visualization. The integration of implicit body models into neural rendering frameworks reflects a promising direction for enhancing dynamic scene reconstruction and rendering tasks. The paper suggests that further exploration into the optimization and representation of complex human models in real-time applications will be valuable. Additionally, future research could explore the interaction between neural rendering techniques and statistical human shape and pose models to expand capabilities in complex, real-world scenarios.

Overall, the work positions H-NeRF as a potent tool in the AI research domain, establishing foundations for advanced human modeling techniques through neural networks. Its success indicates potential paths for developing highly adaptive systems capable of informative, realistic simulations of human activity across diverse conditions.