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

Metadata

Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
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
Link: https://doi.org/10.5594/J13220
Author(s): J. Davidse, R. P. Koppe

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J13220.json

Reference this Doc

Plain text (ISO 690 compliant)

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. Available at https://doi.org/10.5594/J13220

Snippet:

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

HTML (ISO 690 compliant)

Preview:

Snippet:

<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>

SMPTE's HTML Pub

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>