New Techniques to Compensate Mis-tracking within Stereoscopic Acquisition Systems

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 2011, No. 6, pp. 1–23
Abstract: When a lens is mounted to a camera there is an inevitable mechanical tolerance associated with the lens optical center, and another associated with the camera optical center. These separate tolerances can be additive or subtractive for a given lens-camera combination (both tolerances entail unpredictable +/− limits). This aberration poses the greatest challenge to the imaging alignment of stereoscopic rigs. Lens operational dynamics add another variable differential in terms of small mis-tracking between angle of view over the focal range of a zoom lens pair, mis-tracking between their optical focus, and mis-tracking between their aperture settings. Many workers in the field of 3D are diligently seeking practical and cost-effective solutions to these disparities. This paper will describe recent developments that entail automatic and dynamic corrections for these differential tolerances. New software in the digital servo systems that operate lens zoom, iris, and focus control allows entry of compensation data that corrects for mis-tracking errors in these three operational functions. Separately, a novel development by 3D rig designer Microfilms of France, utilizes the technology of optical image stabilization built into an HDTV lens to implement automatic real time correction of both the fixed and the dynamic optical miscentering errors between two lenses. A different image stabilization technology - built-into the lenses of integrated HD lens-camcorders (increasingly popular for small handheld 3D rigs) - allows corrections for the fixed optical mis-centering between any two such systems at specific focal length settings.
Publication Date: 2011-06-01
DOI: 10.5594/M001419
Link: https://doi.org/10.5594/M001419
Author(s): Laurence J. ThorpeCanon USA Inc
Hitoshi YoshidaCanon Europe
Nicolas ChauretMicrofilms France
Louis LapeyerMicrofilms France
David FayolletMicrofilms France
Copyright: © 2011 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

[1] Thorpe L. , “Camera Lens Image Stabilization - Part One” Broadcast Engineering , Feb 2011 pages 6 . EXTERNAL
[2] Thorpe L. , “Camera lens Image Stabilization - Part Two” Broadcast Engineering , Mar 2011 pages 110 – 116 . EXTERNAL
[3] Thorpe L. Image Stabilization Film and Digital Times , Oct 2010 , on their website: www.fdtimes.com . EXTERNAL

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Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyer, and David Fayollet; New Techniques to Compensate Mis-tracking within Stereoscopic Acquisition Systems, SMPTE Meetings and Conferences ( June 2011); SMPTE, 2011. Available at https://doi.org/10.5594/M001419

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Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyer, and David Fayollet; New Techniques to Compensate Mis-tracking within Stereoscopic Acquisition Systems, SMPTE Meetings and Conferences ( June 2011); SMPTE, 2011. Available at https://doi.org/10.5594/M001419

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<span class="citation">Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyer, and David Fayollet; <cite>New Techniques to Compensate Mis-tracking within Stereoscopic Acquisition Systems</cite>, SMPTE Meetings and Conferences ( June 2011); SMPTE, 2011. Available at <a href="https://doi.org/10.5594/M001419" target="_blank" rel="noopener">https://doi.org/10.5594/M001419</a></span>

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Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyer, and David Fayollet; <cite id="bib-10-5594-m001419">New Techniques to Compensate Mis-tracking within Stereoscopic Acquisition Systems</cite>, SMPTE Meetings and Conferences ( June 2011); SMPTE, 2011
<span class="doi">10.5594/M001419</span>
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