A Bidirectional Scattering Function Reconstruction Method Based on Optimization of Microrelief Heights Distribution

Sokolov, V. G.; Zhdanov, Dmitry; Potemin, Igor S.; Zhdanov, Andrey; Deryabin, N. B.

doi:10.51130/graphicon-2020-2-3-6

Cited by 4 publications

(8 citation statements)

References 12 publications

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“…Another numerical approach is based on height density distribution and described in [28]. There is some similarity of the "Heights" and the "Normals" methods.…”

Section: Figure 6 "Normals" Methods Of Bsdf Reconstructionmentioning

confidence: 99%

Overview of BSDF Reconstruction Methods for Rough Surfaces

Sokolov¹,

Voloboy²,

Potemin³

et al. 2022

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The work provides an overview of methods aimed to the reconstruction of Bidirectional Scattering Distribution Function (BSDF) for rough surfaces. The elements with rough surfaces are permanently present in our life and widely used in modern optical devices, for example, in light guiding plates for display illuminating systems, car dashboards, or luminaires. Light scattering by rough surface is an important component in the visual appearance of many materials including water, glass, skin, etc. The problem of the rough surface visualization is complex and contains many different aspects. Accordingly there are many techniques to provide their realistic rendering. In many lighting simulation and optical design tasks it is sufficient and more effective to replace real geometry of rough surface by a surface optical characteristics expressed via BSDF. So, accurate reconstruction of scattering properties of rough surfaces is a significant factor in visualizations tasks and generation of photorealistic images. In some cases, BSDF can be just measured. However, in many cases direct BSDF measurements are impossible if, for example, it is required to define BSDF inside of the material and neither a measuring device detector nor a light source can be placed inside the material. So this results in the development of many approaches for BSDF reconstruction. It started in the end of the last century with the development of many analytical methods based on microfacet models of rough surface such as the Phong, the Ward reflection, the Cook-Torrance models. Nowadays many direct numerical methods of BSDF reconstruction appear, for example, methods based on normals and heights distribution. As a rule, these methods use ray tracing to calculate BSDF. Sizes of microroughness can be small, sufficient to raise a problem which optics wave or ray is more appropriate here. To answer this and other questions related to BSDF reconstruction, an investigation of well-known and effective reconstruct methods was conducted. This paper also presents the study results for eight real samples with different profile parameters of rough surface. The verification is based on numerical comparison with real measured data and visual comparison of images generated using different reconstructed BSDF. Finally, the general recommendations are presented about what methods and for what applications are more appropriate.

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“…Another numerical approach is based on height density distribution and described in [28]. There is some similarity of the "Heights" and the "Normals" methods.…”

Section: Figure 6 "Normals" Methods Of Bsdf Reconstructionmentioning

confidence: 99%

Overview of BSDF Reconstruction Methods for Rough Surfaces

Sokolov¹,

Voloboy²,

Potemin³

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerical methods. Nowadays with increasing of computer power new methods of BSDF reconstruction have been developed in [1,33,34]. Part of them is pure numerical ones.…”

Section: 2mentioning

confidence: 99%

“…Numerical methods are based on building a geometry model of rough surface and calculation of BSDF by light simulation. The method based on the normal density distribution of rough surfaces is proposed in [1,33] and on the height distribution -in [34]. Here a micro-relief is built with help of normal or height distribution represented by an analytical function which parameters are defined with help of the optimization process.…”

Section: 2mentioning

confidence: 99%

Comparison of BSDF Reconstruction Methods for Rough Surfaces

Sokolov

Potemin

Voloboy³

2022

Proceedings of the 32nd International Conference on Computer Graphics and Vision

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The work is devoted to the problem of reconstruction of a bi-directional scattering distribution functions (BSDF) for rough surfaces. The paper contains short overview of different methods and comparison of their results. The elements with rough surfaces are widely used in modern optical devices, for example, such as light guiding plates for illuminating system of displays, car dashboards, or luminaires. So, accurate and effective reconstruction of scattering properties of rough surfaces is important for visualizations tasks and generation of photorealistic images. Typically scattering properties of rough surface are described with help of BSDF. In some cases, BSDF can be just measured; however in many cases direct measurement is not sufficient. For example, if it is required to define BSDF inside of the material. Such measurement is impossible or too expensive because neither detector of the measuring device nor the light source can be placed inside the material. Therefore, a lot of different approaches to reconstruct BSDF for rough surfaces were developed. The approaches are based on both wave and ray optics and use different analytical and numerical solutions. A great variety of approaches results in the situation when you would like to know what method could be selected as more appropriate for the specific sample. This work investigates a bunch of perspective methods of BSDF reconstruction for surfaces of different roughness. The verification is based on numerical as well as visual comparison with real measured data. Finally, the general conclusions and recommendations are presented about what method and for what applications is more appropriate.

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“…The problem is investigated in the work. There are a lot of approaches as analytical as well numerical to reconstruct BSDF properties of rough surface scattering properties, some overview and description of the different approaches is presented in [9][10][11]. A numerical approach ("Normals" method) is applied.…”

Section: Surface Scattering Modelmentioning

confidence: 99%

“…The base idea of BSDF reconstruction is not new and, for example, it can be examined in [1,9,11] papers, however there are some details in simulation of Volume Scattering which it is preferable to consider with the purpose to accelerate process of BSDF extraction.…”

Section: Scheme Of Bsdf Reconstructionmentioning

confidence: 99%

BSDF Reconstruction of Inks and Paints for Light Guiding Plates

Sokolov

Potemin

Zhdanov

et al. 2021

Proceedings of the 31th International Conference on Computer Graphics and Vision. Volume 2

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The work is devoted to the investigation of the best and reasonable methods to reconstruct the scattering properties of inks and paints widely used in modern electronic devices containing various light guiding plates and fibers. Typically scattering properties for inks have a volume scattering nature however it can be complicated with surface scattering because of the microroughness of ink layers. Both the volume and surface scattering reconstruction are considered in the given paper. Typically scattering properties of inks are described with bidirectional scattering functions (BSDF) and the BSDF is required from the internal side of the material of light-guiding elements. It cannot be measured directly because neither detector of the measuring device nor the light source cannot be placed inside the material. The only way to solve the problem of BSDF extraction for such cases is to build computer models of volume and surface scattering for inks and then with optimization procedures reconstruct parameters for these models which can provide surface scattering close enough to scattering of real samples of inks and paints. Light propagation in ink media is very complex requiring a long calculation time. As a result, the selection of an effective optimization procedure is the key point of the task. Several more typical real samples with printed inks are selected for investigation. The achieved results of BSDF extraction show very good agreement with data obtaining by real measurement. The comparison is based on numerical comparison of light scattering of ink samples as well as its visual appearance.

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A Bidirectional Scattering Function Reconstruction Method Based on Optimization of Microrelief Heights Distribution

Cited by 4 publications

References 12 publications

Overview of BSDF Reconstruction Methods for Rough Surfaces

Overview of BSDF Reconstruction Methods for Rough Surfaces

Comparison of BSDF Reconstruction Methods for Rough Surfaces

BSDF Reconstruction of Inks and Paints for Light Guiding Plates

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