Neural reconstruction and rendering strategies have demonstrated state-of-the-art performances due, in part, to their ability to preserve high level shape details. Existing approaches, however, either represent objects as implicit surface functions or neural volumes and still struggle to recover shapes with heterogeneous materials, in particular human skin, hair or clothes. To this aim, we present a new hybrid implicit surface representation to model human shapes. This representation is composed of two surface layers that represent opaque and translucent regions on the clothed human body. We segment different regions automatically using visual cues and learn to reconstruct two signed distance functions (SDFs). We perform surface-based rendering on opaque regions (e.g., body, face, clothes) to preserve high-fidelity surface normals and volume rendering on translucent regions (e.g., hair). Experiments demonstrate that our approach obtains state-of-the-art results on 3D human reconstructions, and also shows competitive performances on other objects.

我们提出了一种新的混合隐式表面表示方法来建模人体形状，该表示方法由两个表面层组成，用于表示穿着衣物的人体的不同区域，我们使用视觉线索自动分割不同区域，并学习重建两个有符号距离函数，我们在不透明区域上执行基于表面的渲染以保留高保真度的表面法线，并在半透明区域上执行体积渲染（例如头发），实验证明我们的方法在3D人体重建上取得了最先进的成果，并在其他物体上展示了有竞争力的表现。

HISR：用于逼真的3D人体重建的混合隐式表面表示