Development of an Accurate and Repeatable Measurement Method for Speckle in Laser Illuminated Projectors

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 2014, No. 10, pp. 1–12
Abstract: With the emergence of lasers as a replacement for xenon arc lamps in ultra-high brightness digital projection applications, it is desirable to preserve the best possible image. Speckle is one aspect of image quality that has been fundamentally difficult to measure, due the unique physical characteristics of coherent light and the absence of a single focal plane for the speckle image. In this paper, the success criteria for a speckle measurement method are identified, and industry work to date is surveyed. The challenges of measuring low values of speckle are identified as: a large number of variables; system interaction among variables; and noise. The concept of Uniform Field Contrast Ratio (UFCR) is introduced to distinguish between Speckle Contrast Ratio (SCR) and contrast due to non-speckle noise sources that can affect SCR measurement. We expect that ultimately two different measurement methods will be needed: one optimized for low noise, and one optimized for commercial cinema installations.
Publication Date: 2014-10-01
DOI: 10.5594/M001585
Link: https://doi.org/10.5594/M001585
Author(s): Rick PoschCR Media Technologies, Westford, MA, USA rickposch@comcast.net
Pete LudéReaID, Inc. Beverly Hills, CA, USA plude@reald.com
Keyword(s): Measurement, Laser, Projector, Projection
Copyright: © 2014 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 . Xu C.Q. , Photonics Device Group , McMaster University . EXTERNAL
2 . LIPA Speckle Metrology Working Group , Meeting Notes, Jan 13, 2014 . EXTERNAL
3 . http://icdm-sid.org/downloads/idms1.html EXTERNAL
4 . https://www.asti-usa.com/media/pdf/commercial/ICAO_9625_3rd_Edition.pdf EXTERNAL
5 . Posch R. , “A Semantic Framework for Speckle Measurement” , May 6 2014 , presented to LIPA SMWG May 13, 2014 . EXTERNAL
6 . Janssens P. , “Laser projector speckle measurements,” in 29th International Display Research Conference. EURODISPLAY 2009, Proc. SID, 5 – 7 ( 2009 ). EXTERNAL
7 . Schmidt T. “Standardization of Speckle Measurement for Large Screen Laser Illuminated Video Projection Systems” , presented at Society for Information Display, International Symposium , June 2014 , SID Symposium Digest of Technical Papers, 45: 423 – 426 . EXTERNAL
8 . Dean Ken and Dubinovsky Mike , Compound Photonics , email correspondence Sep 11 2014 . EXTERNAL

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Rick Posch and Pete Ludé; Development of an Accurate and Repeatable Measurement Method for Speckle in Laser Illuminated Projectors, SMPTE Meetings and Conferences ( October 2014); SMPTE, 2014. Available at https://doi.org/10.5594/M001585

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Rick Posch and Pete Ludé; Development of an Accurate and Repeatable Measurement Method for Speckle in Laser Illuminated Projectors, SMPTE Meetings and Conferences ( October 2014); SMPTE, 2014. Available at https://doi.org/10.5594/M001585

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<span class="citation">Rick Posch and Pete Ludé; <cite>Development of an Accurate and Repeatable Measurement Method for Speckle in Laser Illuminated Projectors</cite>, SMPTE Meetings and Conferences ( October 2014); SMPTE, 2014. Available at <a href="https://doi.org/10.5594/M001585" target="_blank" rel="noopener">https://doi.org/10.5594/M001585</a></span>

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<li>
Rick Posch and Pete Ludé; <cite id="bib-10-5594-m001585">Development of an Accurate and Repeatable Measurement Method for Speckle in Laser Illuminated Projectors</cite>, SMPTE Meetings and Conferences ( October 2014); SMPTE, 2014
<span class="doi">10.5594/M001585</span>
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