Generating a composite video signal

Generating a composite video signal

A composite video signal VO is formed from a foreground signal FG and a background signal BG in accordance with the luminance self-key. A key signal k is derived from the luminance foreground signal in dependence upon clipping levels YU, YO. To avoid a quadratic dependence of the luminance signal du...

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1. Verfasser: RAINER GEHRMANN
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Sprache:eng
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ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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creator RAINER GEHRMANN
description A composite video signal VO is formed from a foreground signal FG and a background signal BG in accordance with the luminance self-key. A key signal k is derived from the luminance foreground signal in dependence upon clipping levels YU, YO. To avoid a quadratic dependence of the luminance signal during product formation of the key signal k with the foreground signal FG (referred to as "double multiplication"), the linear key signal k should be replaced by a control signal h which is hyperbolically formed in such a way that the unwanted quadratic dependence is eliminated, h being defined by h=1-(1-k)*YU/YFG, where YFG is the foreground luminance and YU is a lower clipping level and VO is defined as VO=h*FG+(1-k)*BG.
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To avoid a quadratic dependence of the luminance signal during product formation of the key signal k with the foreground signal FG (referred to as "double multiplication"), the linear key signal k should be replaced by a control signal h which is hyperbolically formed in such a way that the unwanted quadratic dependence is eliminated, h being defined by h=1-(1-k)*YU/YFG, where YFG is the foreground luminance and YU is a lower clipping level and VO is defined as VO=h*FG+(1-k)*BG.</description><edition>6</edition><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><creationdate>1996</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19960327&amp;DB=EPODOC&amp;CC=GB&amp;NR=2293515A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19960327&amp;DB=EPODOC&amp;CC=GB&amp;NR=2293515A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>RAINER GEHRMANN</creatorcontrib><title>Generating a composite video signal</title><description>A composite video signal VO is formed from a foreground signal FG and a background signal BG in accordance with the luminance self-key. 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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
title Generating a composite video signal
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