标题： 偏振BSSRDF动态人脸获取 显示英文标题

标题： Polarimetric BSSRDF Acquisition of Dynamic Faces

摘要： 偏振光反射和散射的获取与建模有助于揭示物体的形状、结构和物理特性，在计算机图形学中变得越来越重要。然而，当前的偏振获取系统仅限于静态和不透明物体。另一方面，人脸提出了特别大的挑战，由于其复杂的结构和反射特性，存在强烈的时空变化的次表面散射，并且具有动态特性。我们提出了一种新的动态人脸偏振获取方法，专注于在各种肤色和面部表情范围内捕捉空间变化的外观和精确几何结构。它包括单层和异质性次表面散射、折射率以及镜面粗糙度和强度等参数，同时揭示基于生物物理的成分，如内层和外层血红蛋白、真黑色素和褐黑色素。我们的方法利用这些成分独特的多光谱吸收特征来量化它们的浓度，从而向我们的模型提供皮肤层内发生的复杂相互作用的信息。据我们所知，我们的工作是首次同时获取偏振和光谱反射信息以及动态人脸的基于生物物理的皮肤参数和几何结构。此外，我们的偏振皮肤模型可以无缝集成到各种渲染流程中。 显示英文摘要

摘要： Acquisition and modeling of polarized light reflection and scattering help reveal the shape, structure, and physical characteristics of an object, which is increasingly important in computer graphics. However, current polarimetric acquisition systems are limited to static and opaque objects. Human faces, on the other hand, present a particularly difficult challenge, given their complex structure and reflectance properties, the strong presence of spatially-varying subsurface scattering, and their dynamic nature. We present a new polarimetric acquisition method for dynamic human faces, which focuses on capturing spatially varying appearance and precise geometry, across a wide spectrum of skin tones and facial expressions. It includes both single and heterogeneous subsurface scattering, index of refraction, and specular roughness and intensity, among other parameters, while revealing biophysically-based components such as inner- and outer-layer hemoglobin, eumelanin and pheomelanin. Our method leverages such components' unique multispectral absorption profiles to quantify their concentrations, which in turn inform our model about the complex interactions occurring within the skin layers. To our knowledge, our work is the first to simultaneously acquire polarimetric and spectral reflectance information alongside biophysically-based skin parameters and geometry of dynamic human faces. Moreover, our polarimetric skin model integrates seamlessly into various rendering pipelines.