A Factorized Multi-scale Appearance Model

现代3D计算机图形软件包被用来合成令人信服的虚拟世界的照片真实感图像，用于各种应用，包括建筑可视化、广告、互动游戏和故事片制作的视觉效果。这些软件工具的核心是渲染引擎，负责根据反射和能量守恒的物理定律模拟光的行为。在执行这些模拟之前，数字艺术家为3D场景中的每个(虚拟)对象赋予物理属性；这些属性最终描述对象的外观。例如，导致塑料外观的属性与导致金属外观或哑光外观的属性显著不同。对现实世界对象的外观进行建模是具有挑战性的，因为精细的细节(即划痕和其他小规模缺陷)会影响对象基于观看距离而感知的反射率。本提案中概述的研究项目将设计出这样一个多尺度外观的数学模型，以及有效评估此类模型的软件算法，用于逼真的图像合成。

Modern 3D computer graphics software packages are used to synthesize convincing photorealistic images ofvirtual worlds for use in a variety of applications, including architectural visualization, advertisement,interactive gaming, and visual effects for feature film productions.At the core of these software tools lies a rendering engine, responsible for simulating the behaviour of lightaccording to the physical laws of reflection and energy conservation. Prior to the execution of thesesimulations, digital artists attribute physical properties to each (virtual) object in a 3d scene; these propertiesultimately describe the way an object will appear. For example, the properties that lead to a plastic appearanceare significantly different than those that lead to a metallic appearance, or a matte appearance.Modeling the appearance of real-world objects is challenging, since fine-scale details (i.e., scratches and othersmall-scale imperfections) can impact the perceived reflectance of an object based on the distance that it isbeing viewed from.The research project outlined in this proposal will devise a mathematical model of such multi-scale appearance,and software algorithms to efficiently evaluate such a model, for use in realistic image synthesis.