Normal‐Based Bas‐Relief Modelling via Near‐Lighting Photometric Stereo,Computer Graphics Forum

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Normal‐Based Bas‐Relief Modelling via Near‐Lighting Photometric Stereo
Computer Graphics Forum ( IF 2.7 ) Pub Date : 2019-07-05 , DOI: 10.1111/cgf.13754
M. Wei _{1,

2} , Z. Song ₃ , Y. Nie ₃ , J. Wu ₃ , Z. Ji ₄ , Y. Guo ₂ , H. Xie ₅ , J. Wang ₁ , F. L. Wang ₆

Affiliation

We present a near‐lighting photometric stereo (NL‐PS) system to produce digital bas‐reliefs from a physical object (set) directly. Unlike both the 2D image and 3D model‐based modelling methods that require complicated interactions and transformations, the technique using NL‐PS is easy to use with cost‐effective hardware, providing users with a trade‐off between abstract and representation when creating bas‐reliefs. Our algorithm consists of two steps: normal map acquisition and constrained 3D reconstruction. First, we introduce a lighting model, named the quasi‐point lighting model (QPLM), and provide a two‐step calibration solution in our NL‐PS system to generate a dense normal map. Second, we filter the normal map into a detail layer and a structure layer, and formulate detail‐ or structure‐preserving bas‐relief modelling as a constrained surface reconstruction problem of solving a sparse linear system. The main contribution is a WYSIWYG (i.e. what you see is what you get) way of building new solvers that produces multi‐style bas‐reliefs with their geometric structures and/or details preserved. The performance of our approach is experimentally validated via comparisons with the state‐of‐the‐art methods.

中文翻译：

基于法线的浅浮雕建模通过近光光度立体

我们提出了一种近光光度立体 (NL-PS) 系统，可直接从物理对象（集合）生成数字浅浮雕。与需要复杂交互和转换的 2D 图像和基于 3D 模型的建模方法不同，使用 NL-PS 的技术易于与具有成本效益的硬件一起使用，在创建基础时为用户提供抽象和表示之间的权衡。救济。我们的算法包括两个步骤：法线图获取和约束 3D 重建。首先，我们引入了一个称为准点照明模型（QPLM）的照明模型，并在我们的 NL-PS 系统中提供了一个两步校准解决方案来生成密集的法线贴图。其次，我们将法线贴图过滤成细节层和结构层，并将保留细节或结构的浅浮雕建模制定为求解稀疏线性系统的受约束表面重建问题。主要贡献是一种 WYSIWYG（即所见即所得）方式来构建新的解算器，该解算器可以生成保留几何结构和/或细节的多风格浅浮雕。通过与最先进的方法进行比较，我们的方法的性能得到了实验验证。

更新日期：2019-07-05

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