Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics

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Publisher: SMPTE
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE Motion Imaging Jour.
Volume: 133, No. 5, pp. 52–59
Abstract: Global Dimming techniques are being employed to boost the power efficiency of digital cinema projectors. Global Dimming of a display's light source leads to power savings and improves the black level in scenes with limited bright features. Depending on the implementation, it can faithfully reproduce any content or trade accuracy for increased power savings. This article simulates the expected power savings of Global Dimming in cinema under various scenarios. Numerical findings suggest an average of ~20% power savings when faithfully reproducing content, which can drastically increase to ~55% if the top 1% of content is clipped or tone mapped. Combining limited tone-mapping with refreshing dimming only at shot intersections is promising, offering significant power savings while maintaining artifact-free rendering. However, implementing this approach faces several workflow and distribution hurdles. Combining Global Dimming and Lightsteering HDR technology, where light can be used much more efficiently, could lead to significant power savings for exhibitors.
Publication Date: 2024-09-01
DOI: 10.5594/JMI.2024/ORAX6147
ISSN: Print: 1545-0279 | Electronic: 2160-2492
Link: https://doi.org/10.5594/JMI.2024/ORAX6147
Author(s): Nusrat Mehajabin
Anders Ballestad
Gerwin Damberg
Ronan Boitard
Keyword(s): Power Consumption, DCinema, Global Dimming
Copyright: © 2024 SMPTE

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Nusrat Mehajabin, Anders Ballestad, Gerwin Damberg, and Ronan Boitard; Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics, MIJ 2024, Volume 133, Number 5 (pp. 52 to 59); SMPTE, 2024. Available at https://doi.org/10.5594/JMI.2024/ORAX6147

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Nusrat Mehajabin, Anders Ballestad, Gerwin Damberg, and Ronan Boitard; Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics, MIJ 2024, Volume 133, Number 5 (pp. 52 to 59); SMPTE, 2024. Available at https://doi.org/10.5594/JMI.2024/ORAX6147

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<span class="citation">Nusrat Mehajabin, Anders Ballestad, Gerwin Damberg, and Ronan Boitard; <cite>Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics</cite>, MIJ 2024, Volume 133, Number 5 (pp. 52 to 59); SMPTE, 2024. Available at <a href="https://doi.org/10.5594/JMI.2024/ORAX6147" target="_blank" rel="noopener">https://doi.org/10.5594/JMI.2024/ORAX6147</a></span>

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Nusrat Mehajabin, Anders Ballestad, Gerwin Damberg, and Ronan Boitard; Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics, MIJ 2024, Volume 133, Number 5 (pp. 52 to 59); SMPTE, 2024
doi: 10.5594/JMI.2024/ORAX6147
url: https://doi.org/10.5594/JMI.2024/ORAX6147

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Nusrat Mehajabin, Anders Ballestad, Gerwin Damberg, and Ronan Boitard; <cite id="bib-10-5594-jmi-2024-orax6147">Reducing Cinema Projectors Power Consumption Using Global Dimming and Image Statistics</cite>, MIJ 2024, Volume 133, Number 5 (pp. 52 to 59); SMPTE, 2024
<span class="doi">10.5594/JMI.2024/ORAX6147</span>
</li>