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Reconstruction of cumulative daylight illumination fields from high dynamic range imaging: Theory, deployment and in-situ validation

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journal contribution
posted on 13.07.2020, 13:51 by John MardaljevicJohn Mardaljevic, Stephen Cannon-Brookes, Nigel Blades, Katy Lithgow
A novel high-dynamic range (HDR) camera-based approach to measure the cumulative daylight dose in historic/conservation spaces has been devised and tested in a real-world setting under normal viewing conditions. The technique derives illuminance from the HDR-acquired luminance at numerous patches of the wall surfaces visible in the HDR image. These patches serve as proxy illuminance meters, thereby allowing the prevailing illumination field across the entire visible wall to be derived using a Kriging algorithm. The technique was validated under both controlled and in-situ conditions over periods of several months and shown to have comparable accuracy to the illuminance logging devices commonly used in historic/conservation settings. The set-up comprising a consumer digital camera and tethered computer proved remarkably resilient and allowed for continuous monitoring periods of six months or more. Application in a real-world setting revealed operational practicalities that would not have been found in a controlled environment.

Funding

National Trust (UK)

History

School

  • Architecture, Building and Civil Engineering

Published in

Lighting Research and Technology

Volume

53

Issue

4

Pages

311-331

Publisher

SAGE Publications

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Sage under the Creative Commons Attribution-NonCommercial 4.0 International Licence (CC BY-NC). Full details of this licence are available at: https://creativecommons.org/licenses/by-nc/4.0/

Acceptance date

03/07/2020

Publication date

2020-08-25

Copyright date

2021

ISSN

1365-7828

Language

en

Depositor

Prof John Mardaljevic . Deposit date: 8 July 2020