New Techniques to Compensate for Mistracking within Stereoscopic Acquisition Systems

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE Mot. Imag. J
Volume: 121, No. 7, pp. 34–47
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 additive and subtractive 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 mistracking between angle of view over the focal range of a zoom lens pair, mistracking between their optical focus, and mistracking between their aperture settings. Many workers in the field of three-dimensional (3D) technology are diligently seeking practical and cost-effective solutions to these disparities. This paper describes 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 mistracking errors in these three operational functions. Separately, a novel development by 3D rig designer Microfilms of France uses the technology of optical image stabilization built into a high-definition (HD) television lens to implement automatic realtime 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 miscentering between any two such systems at specific focal length settings.
Publication Date: 2012-10-01
DOI: 10.5594/j18232XY
ISSN: Print: 1545-0279
Link: https://doi.org/10.5594/j18232XY
Author(s): Laurence J. Thorpe
bio
Laurence J. Thorpe joined the Broadcast and Communications Division of Canon U.S.A., Inc., in 2004 as national marketing executive. Before that, he worked at Sony Electronics, where he spent more than 20 years in HDTV development. Thorpe also worked for RCA's Broadcast Division from 1966 to 1982, where he developed a range of color television cameras and telecine products. He holds ten patents from this period. From 1961 to 1966, Thorpe worked in the Designs Dept. of the BBC in London, England, where he participated in the development of a range of color television studio products. — Thorpe graduated from the College of Technology in Dublin, Ireland, in 1961, with a degree in electrical engineering. He received his Chartered Engineer (C. Eng.) and MIEE distinction in 1965 from the Institution of Electrical Engineers in London, England.
Hitoshi Yoshida
bio
Following his formal education, Hitoshi Yoshida joined Canon Inc., where he spent several years in the production department of the optical factory. He started his North American career in July 1990 as a service support specialist for five years and then transferred to Canon Canada, as manager of the BCTV division. Following nine years in Toronto, Yoshida returned to Japan in 2004. After one year, he returned to the U.S. in April 2005. He was assigned as manager, service and support in the BCTV Division until 2011 and later transferred to London where he presently manages the European Service & Technical Support operation.
Nicolas Chauret
Louis Lapeyre
David Fayollet
Copyright: © 2012 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Thorpe L. , “Camera Lens Image Stabilization: Part 1,” Broadcast Engineering , p. 6 , Feb. 2011 . EXTERNAL
2. Thorpe L. , “Camera Lens Image Stabilization: Part 2,” Broadcast Engineering , pp. 110 – 116 , Mar. 2011 . EXTERNAL
3. Thorpe L. , “Image Stabilization,” Film and Digital Times , www.fdtimes.com . EXTERNAL

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Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyre, and David Fayollet; New Techniques to Compensate for Mistracking within Stereoscopic Acquisition Systems, SMPTE Motion Imaging Journal ( Volume: 121, Issue: 7, 2012); SMPTE, 2012. Available at https://doi.org/10.5594/j18232XY

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Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyre, and David Fayollet; New Techniques to Compensate for Mistracking within Stereoscopic Acquisition Systems, SMPTE Motion Imaging Journal ( Volume: 121, Issue: 7, 2012); SMPTE, 2012. Available at https://doi.org/10.5594/j18232XY

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<span class="citation">Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyre, and David Fayollet; <cite>New Techniques to Compensate for Mistracking within Stereoscopic Acquisition Systems</cite>, SMPTE Motion Imaging Journal ( Volume: 121, Issue: 7, 2012); SMPTE, 2012. Available at <a href="https://doi.org/10.5594/j18232XY" target="_blank" rel="noopener">https://doi.org/10.5594/j18232XY</a></span>

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<li>
Laurence J. Thorpe, Hitoshi Yoshida, Nicolas Chauret, Louis Lapeyre, and David Fayollet; <cite id="bib-10-5594-j18232xy">New Techniques to Compensate for Mistracking within Stereoscopic Acquisition Systems</cite>, SMPTE Motion Imaging Journal ( Volume: 121, Issue: 7, 2012); SMPTE, 2012
<span class="doi">10.5594/j18232XY</span>
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