Human View Synthesis using a Single Sparse RGB-D Input

Abstract

Novel view synthesis for humans in motion is a challenging computer vision problem that enables applications such as free-viewpoint video. Existing methods typically use complex setups with multiple input views, 3D supervision, or pre-trained models that do not generalize well to new identities. Aiming to address these limitations, we present a novel view synthesis framework to generate realistic renders from unseen views of any human captured from a single-view sensor with sparse RGB-D, similar to a low-cost depth camera, and without actor-specific models. We propose an architecture to learn dense features in novel views obtained by sphere-based neural rendering, and create complete renders using a global context inpainting model. Additionally, an enhancer network leverages the overall fidelity, even in occluded areas from the original view, producing crisp renders with fine details. We show our method generates high-quality novel views of synthetic and real human actors given a single sparse RGB-D input. It generalizes to unseen identities, new poses and faithfully reconstructs facial expressions. Our approach outperforms prior human view synthesis methods and is robust to different levels of input sparsity.