Per-Pixel Lighting Data Analysis

Abstract

This report presents a framework for per-pixel analysis of the qualitative and quantitative aspects of luminous environments. Recognizing the need for better lighting analysis capabilities and appreciating the new measurement abilities developed within the LBNL Lighting Measurement and Simulation Toolbox, "Per-pixel Lighting Data Analysis" project demonstrates several techniques for analyzing luminance distribution patterns, luminance ratios, adaptation luminance and glare assessment. The techniques are the syntheses of the current practices in lighting design and the unique practices that can be done with per-pixel data availability. Demonstrated analysis techniques are applicable to both computer-generated and digitally captured images (physically-based renderings and High Dynamic Range photographs).

Measuring light in field experiments using dummies and objects: A study of concert lighting

“…The spectral response of the meter’s photocell was calibrated to match the CIE relative photopic luminous efficiency, thus ensuring the photometric data extracted from the HDR images were corrected. The average error in luminance was 9.88%, which is similar to the values reported by Inanici and Galvin, 55 Inanici, 56 Moeck 57 and Newsham and Arsenault. 58 A set of binary masks was created to define regions of the visual field assuming binocular vision with left and right monocular fields.…”

“…The spectral response of the meter's photocell was calibrated to match the CIE relative photopic luminous efficiency, thus ensuring the photometric data extracted from the HDR images were corrected. The average error in luminance was 9.88%, which is similar to the values reported by Inanici and Gavin, 55 Inanici, 56 Moeck 57 and Newsham and Arsenault. 58 Standard deviation of the luminance seen through the binocular field ((LLM avg +LRM avg )/2):LB avg A ratio of average luminance seen through the left and right monocular fields to average luminance seen through the binocular field ((LLM std +LRM std )/2):LB std A ratio of the standard deviation of the luminance seen through the left and right monocular fields to the standard deviation of luminance seen through the binocular field LLM avg :LRM avg A ratio of average luminance seen through the left monocular field to that seen through the right monocular field LLM std :LRM std A ratio of the standard deviation of luminance seen through the left monocular field to that seen through the right monocular field For the same reason, Lavg measured at Spot E was 61% to 71% lower in the right peripheral field and Lstd was 80% to 98% lower, particularly when the peripheral wall lighting was included.…”

Effects of interior wood finishes on the lighting ambiance and materiality of architectural spaces

“…They are used to analyse images based on the daylight distribution within the space to evaluate the luminosity and visualize the spatial luminance and illuminance distributions within an architectural ambiance. 28…”

Impact of Indoor Use of Wood on the Quality of Interior Ambiances under Overcast and Clear Skies: Case Study of the Eugene H. Kruger Building, Québec City

“…A HDR photography technique was used to collect luminance data in a large (180° by 180°) field of view (Inanici 2005). The Photolux photoluminance meter consists of a calibrated Canon EOS 50D equipped with an EF lens was used to produce High dynamic range (HDR) images consisting of different luminance ranges.…”

“…This type of images do not produce any subjective response of the eye, as does the chromatic contrast found in color photographs (Demers 2007). False color images were used to analyze the viewpoints based on the daylight distribution within the space to evaluate the luminosity and visualize the spatial luminance and illuminance distributions (Inanici 2005).…”