Mr. Yanlei Liu Profile

Yanlei Liu

at Henan Normal Univ

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Publications (3)

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SPIE Journal Paper | 7 November 2024

Reflection modeling of rough metal surfaces using statistical theory

Shupeng Li, Zilong Liu, Xingchuang Xiong, Yanlei Liu

OE, Vol. 63, Issue 11, 114102, (November 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.11.114102

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Bidirectional reflection distribution function (BRDF) models can accurately capture the reflective properties of target surfaces, thus playing a crucial role in achieving realistic image rendering in the field of computer graphics. The reflection model based on microfacet theory, which relies on a single roughness parameter, inadequately simulates the reflection properties of rough metal surfaces, thereby limiting rendering realism. To address this issue, we propose an improved method that introduces a glossiness parameter into the microfacet theory, thereby constructing the roughness-glossiness-Cook-Torrance (RGCT) reflection model. The glossiness parameter accurately captures the ratio and distribution of specular and diffuse reflections, which is directly related to the glossy properties of metal surfaces, enhancing the accuracy of the model in simulating the interaction between light and rough metal surfaces. We conducted comparative experiments on rough metal surfaces in the near-infrared wavelength bands with incidence angles from 0 to 90 deg. Experimental results demonstrate that compared to the traditional Cook-Torrance (CT) model based on microfacet theory, the RGCT model reduces the root mean square error (RMSE) by 0.0041 and 0.0048 on average, improves the coefficient of determination R2 by 0.0649 and 0.1082 on average, and reduces the relative error by 8.23% and 15.84% in the 1064 and 1550 nm wavelength bands, respectively. This improvement enhances the accuracy of the model in simulating the interaction between light and rough metal surfaces.

SPIE Journal Paper | 31 January 2024

Study on the reflectance characteristics of periodic microstructure surface

Zhihao Yuan, Yanlei Liu, Zhiying Chen, Yufang Liu

OE, Vol. 63, Issue 01, 015103, (January 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.1.015103

KEYWORDS: Reflectivity, Bidirectional reflectance transmission function, Reflection, Scattering, Specular reflections, Diffraction, Aluminum, Optical properties, Optical engineering, Surface properties

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This research focuses primarily on investigating the optical scattering characteristics of a structured aluminum surface with periodic circular hollow cavities. The influence of cavity parameters on the scattering characteristics is examined through numerical computation and experimentation. The numerical computations reveal that the reflectance characteristics are primarily determined by the depth and radius of the cavities, as well as the angle of incidence. The samples with periodic microstructures were fabricated, and their bidirectional reflectance distribution function (BRDF) was measured. The measurement results demonstrate good agreement with the numerical computations, indicating that BRDF accurately describes the spectral scattering of the structured surface. This study highlights the significance of comprehensively investigating the scattering properties of microstructures to better understand their reflection properties and evaluate their optical control effects.

Proceedings Article | 12 January 2018 Paper

Polarized BRDF measurement of the type E235B low carbon structural steel

Yanlei Liu, Kun Yu, Kaihua Zhang, Yufang Liu

Proceedings Volume 10621, 106210S (2018) https://doi.org/10.1117/12.2286212

KEYWORDS: Bidirectional reflectance transmission function

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Bidirectional reflectance distribution function (BRDF) offers complete description of the spectral and spatial characteristics of opaque materials. The polarized BRDF contains more information, especially for the painted objects and target recognition. In this letter, we measured the in plane polarized spectral BRDF for the steel E235B in the wavelength range of 450-600 nm. The reliability of our results is verified by comparing the experimental data of polytetrafluoroethylene with the reference data. The measuring results indicates that the wavelength of incident light has a positive effect on the BRDF near the specular direction, and has a negative influence for other direction. BRDF increases slowly with reflected zenith angle and decreases rapidly with peak occurs at specular direction, which may be attributed to the shadowing effect. In addition, the results presents that the polarization of incident light has a slight influence on the BRDF of the sample.

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