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SMPTE Journal ( Volume: 86, Issue: 3, March 1977)
[ACTIVE]

A Chroma-Key System Insensitive to Variations of the Background Illumination

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
86, No. 3, pp. 140–143
Abstract
Conventional chroma-key systems derive the chroma-key switching signal from chrominance-type signals. Because such signals are luminance-dependent, this method involves stringent requirements for stage build-up and background illumination. A novel chroma-key system is described, based on luminance-independent chromaticity criteria. With this system, requirements for scene build-up and background illumination are considerably alleviated, to the great benefit of the studio artist seeking to increase his design freedom. Topics discussed include: formation of the chroma-key switching signal, errors due to the employment of chrominance signals, improvement of chroma-keying by chromaticity-based switching, and prevention of false keying in dark parts of the scene. Data for plotting loci on the CIE x-y chromaticity diagram are derived.
Publication Date
1977-03-01
DOI
10.5594/J13220
ISSN
Print: 0036-1682
Link
https://doi.org/10.5594/J13220
Author(s)
J. DavidseDept. of Electrical Engineering, Delft University of Technology, 4, Mckelweg, Delft-8, the Netherlands
R. P. KoppeDept. of Electrical Engineering, Delft University of Technology, 4, Mckelweg, Delft-8, the Netherlands
Copyright
© 1977 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • 1. Friedmann R. , “Einige Anwendungsbeispiele für das Chroma-Key Verfahren in der Fernsehstudiotechnik,” Rundfunktechnische Mitteilungen , 15 : 214 – 225 , 1971 . EXTERNAL
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J. Davidse and R. P. Koppe; A Chroma-Key System Insensitive to Variations of the Background Illumination, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J13220
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J. Davidse and R. P. Koppe; A Chroma-Key System Insensitive to Variations of the Background Illumination, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J13220

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J. Davidse and R. P. Koppe; A Chroma-Key System Insensitive to Variations of the Background Illumination, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J13220
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<span class="citation">J. Davidse and R. P. Koppe; <cite>A Chroma-Key System Insensitive to Variations of the Background Illumination</cite>, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977. Available at <a href="https://doi.org/10.5594/J13220" target="_blank" rel="noopener">https://doi.org/10.5594/J13220</a></span>

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Preview:
J. Davidse and R. P. Koppe; A Chroma-Key System Insensitive to Variations of the Background Illumination, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977
doi: 10.5594/J13220
url: https://doi.org/10.5594/J13220
Snippet:
<li>
J. Davidse and R. P. Koppe; <cite id="bib-10-5594-j13220">A Chroma-Key System Insensitive to Variations of the Background Illumination</cite>, SMPTE Journal ( Volume: 86, Issue: 3, March 1977); SMPTE, 1977
<span class="doi">10.5594/J13220</span>
</li>

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