Fast measurement of chromatic BSDF and its application to LED lighting

Yeh Wei Yu; Wei Hsin Chen; Tsung Hsun Yang; Xuan Hao Lee; Ching Cherng Sun

doi:10.1117/12.2532856

Fast measurement of chromatic BSDF and its application to LED lighting

Yeh Wei Yu, Wei Hsin Chen, Tsung Hsun Yang, Xuan Hao Lee, Ching Cherng Sun

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Bidirectional scattering distribution function (BSDF) represents the scattered light distribution in forward and backward directions. BSDF is an important function in precise lighting design, because surface scattering is difficult to determine and including it in simulations. However, to measure a whole field BSDF is time consuming, as it can take as long as a day. In this paper, we propose and demonstrate a new way to measure BSDF. We utilize a screen that is illuminated by the scattered light, and a camera that captures the image on the screen. A complex calibration between the grey level of the camera and intensity is performed to make sure the measurement is valid. Through continuously imaging the screen for various scattered light distributions, an image fusion is performed to present the final BSDF. We call this instrument as screen image synthesis (SIS) BSDF meter. In this paper, two generations of SIS BSDF meter was developed, and is shown in details.

Original language	English
Title of host publication	Current Developments in Lens Design and Optical Engineering XX
Editors	R. Barry Johnson, Virendra N. Mahajan, Simon Thibault
Publisher	SPIE
ISBN (Electronic)	9781510629011
DOIs	https://doi.org/10.1117/12.2532856
State	Published - 2019
Event	Current Developments in Lens Design and Optical Engineering XX 2019 - San Diego, United States Duration: 12 Aug 2019 → …

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11104
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Current Developments in Lens Design and Optical Engineering XX 2019
Country/Territory	United States
City	San Diego
Period	12/08/19 → …

Keywords

BSDF
Intensity distribution
SIS
Screen image synthesis

Access to Document

10.1117/12.2532856

Sub-Project One : Study of Simulation Model for Strong Volume Hologram with Complex Wavefront(3/3)
Sun, C.-C. (PI)
1/08/21 → 31/10/22
Project: Research
"Naked-Eyes 3d Vedio without Display" Implemented by Volume Holographic Optical Element(3/3)
Yu, Y.-W. (PI)
1/08/21 → 31/10/22
Project: Research
Leds-Based Standard Illuminant(2/2)
Yang, T.-H. (PI)
1/08/20 → 31/07/21
Project: Research

Cite this

Yu, Y. W., Chen, W. H., Yang, T. H., Lee, X. H., & Sun, C. C. (2019). Fast measurement of chromatic BSDF and its application to LED lighting. In R. B. Johnson, V. N. Mahajan, & S. Thibault (Eds.), Current Developments in Lens Design and Optical Engineering XX Article 111040I (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11104). SPIE. https://doi.org/10.1117/12.2532856

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title = "Fast measurement of chromatic BSDF and its application to LED lighting",

abstract = "Bidirectional scattering distribution function (BSDF) represents the scattered light distribution in forward and backward directions. BSDF is an important function in precise lighting design, because surface scattering is difficult to determine and including it in simulations. However, to measure a whole field BSDF is time consuming, as it can take as long as a day. In this paper, we propose and demonstrate a new way to measure BSDF. We utilize a screen that is illuminated by the scattered light, and a camera that captures the image on the screen. A complex calibration between the grey level of the camera and intensity is performed to make sure the measurement is valid. Through continuously imaging the screen for various scattered light distributions, an image fusion is performed to present the final BSDF. We call this instrument as screen image synthesis (SIS) BSDF meter. In this paper, two generations of SIS BSDF meter was developed, and is shown in details.",

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author = "Yu, {Yeh Wei} and Chen, {Wei Hsin} and Yang, {Tsung Hsun} and Lee, {Xuan Hao} and Sun, {Ching Cherng}",

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series = "Proceedings of SPIE - The International Society for Optical Engineering",

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Yu, YW, Chen, WH, Yang, TH, Lee, XH & Sun, CC 2019, Fast measurement of chromatic BSDF and its application to LED lighting. in RB Johnson, VN Mahajan & S Thibault (eds), Current Developments in Lens Design and Optical Engineering XX., 111040I, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11104, SPIE, Current Developments in Lens Design and Optical Engineering XX 2019, San Diego, United States, 12/08/19. https://doi.org/10.1117/12.2532856

Fast measurement of chromatic BSDF and its application to LED lighting. / Yu, Yeh Wei; Chen, Wei Hsin; Yang, Tsung Hsun et al.
Current Developments in Lens Design and Optical Engineering XX. ed. / R. Barry Johnson; Virendra N. Mahajan; Simon Thibault. SPIE, 2019. 111040I (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11104).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Sun, Ching Cherng

PY - 2019

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Fast measurement of chromatic BSDF and its application to LED lighting

Abstract

Publication series

Conference

Keywords

Access to Document

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Projects

Sub-Project One : Study of Simulation Model for Strong Volume Hologram with Complex Wavefront(3/3)

&quot;Naked-Eyes 3d Vedio without Display&quot; Implemented by Volume Holographic Optical Element(3/3)

Leds-Based Standard Illuminant(2/2)

Cite this

"Naked-Eyes 3d Vedio without Display" Implemented by Volume Holographic Optical Element(3/3)