3D geometric attenuation factor for discrete Gaussian microsurfaces

IF 3.5 2区 工程技术 Q2 OPTICS Optics and Lasers in Engineering Pub Date : 2024-10-29 DOI:10.1016/j.optlaseng.2024.108656
Qi Hu , Jiahao Yang , Jin Duan , Youfei Hao , Huateng Ding , Xinming Zhang , Wenbo Zhu , Weijie Fu
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Abstract

The geometric attenuation factor plays an important role in the construction of polarized bidirectional reflection distribution function (pBRDF) model, but the traditional geometric attenuation factor theory neglects the influence of microsurface height on the shadowing and masking effects of light. Therefore, we present a geometric attenuation factor related to the height of the discrete Gaussian microsurface based on microfacet theory. We correspond each sampled point on the microsurface to an element in the attenuation matrix, and assign values to the elements of the attenuation matrix by determining whether the sampling points are illuminated or observable. Finally, we can get the numerical solution of the geometric attenuation factor of the 3D discrete Gaussian microsurface by calculating the attenuation matrix. The results show that the presented geometric attenuation factor is reasonable and effective, and can be better applied to pBRDF model to improve the accuracy of pBRDF model.
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离散高斯微表面的三维几何衰减系数
几何衰减系数在偏振双向反射分布函数(pBRDF)模型的构建中起着重要作用,但传统的几何衰减系数理论忽略了微表面高度对光的阴影和掩蔽效应的影响。因此,我们根据微面理论提出了与离散高斯微面高度相关的几何衰减系数。我们将微表面上的每个采样点与衰减矩阵中的一个元素对应起来,并通过确定采样点是否被照亮或可观测,为衰减矩阵的元素赋值。最后,我们可以通过计算衰减矩阵得到三维离散高斯微表面几何衰减系数的数值解。结果表明,所提出的几何衰减系数合理有效,可以更好地应用于 pBRDF 模型,提高 pBRDF 模型的精度。
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来源期刊
Optics and Lasers in Engineering
Optics and Lasers in Engineering 工程技术-光学
CiteScore
8.90
自引率
8.70%
发文量
384
审稿时长
42 days
期刊介绍: Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques
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