Implementing International Standards for Light Quantification with luox
"Discover luox, an open-source web platform that implements international standards for quantifying light sources and exposures. Learn how it influences human perception, physiology, and behavior, and explore its easy-to-use calculations related to light. Find out how luox follows CIE guidance and addresses challenges in precision." (297 characters)
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Presentation Transcript
luox: An open-source, open-access web platform implementing international standards for the quantification of light Somang Nam, Ph.D., Jennifer A. Veitch, Ph.D., & Manuel Spitschan, Ph.D. FOSDEM Lightning talks, 2022-02-06
Background: Quantities that describe light sources and exposures Light influences human perception, physiology, and behaviour Vision, including colour perception and image interpretation Circadian, neuroendocrine and sleep physiology International consensus documents define quantities, units, and characterizations for light sources and exposures calculated from spectral data CIE S 026:/E:2018 defines the quantification of light exposures for retinal photoreceptors CIE 015:2018 and CIE 224:2017 define parameters related to colour 2
Background: Reporting of light quantities No guidelines for measuring and reporting the stimulus conditions in chronobiology/sleep research studies until recently There are many parameters to calculate Calculations can seem non-trivial to beginners Goal: develop an easy-to-use, open-access web platform for calculations related to light 3
luox Lightweight platform for calculations based on spectral information Open source (GPLv3) No data stored anywhere ES6, React, and webpack Formatting: Prettier, ESLint - Airbnb style guide https://luox.app/ https://github.com/luox-app/luox 4
luox Calculations follow guidance from the International Commission on Illumination (CIE) CIE reports and standard formula were translated into JS functions using math.js Example: Colour Fidelity Index, Rf(CIE 224:2017) 44 formula 6
Demo luox_ Home - Google Chrome 2022-01-19 15-42-45_Trim.mp4 7
Current challenge Precision Displays floating point precision up to four decimals for all quantities Downloaded .csv file carries higher precision Users demand higher precision accuracy, but JS is limited to using the IEEE 754 standard Temporary mitigation: displaying intermediate calculations for power users 8
Status and future work The CIE has validated luox calculations related to CIE S026:2018 and CIE 1931 (x,y) chromaticity, as a black box check. Checks will be conducted on new code for additional CIE parameters before they are launched on the site. Additional features may be added. Documentation on Wellcome Open Journal: https://doi.org/10.12688/wellcomeopenres.16595.2. 9
THANK YOU somang.nam@nrc-cnrc.gc.ca jennifer.veitch@nrc-cnrc.gc.ca manuel.spitschan@tum.de
