Device and method for processing a signal with a subject moving against a colored background
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United States of America Patent
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Jul 13, 1999
Grant Date -
N/A
app pub date -
Nov 25, 1996
filing date -
Nov 23, 1995
priority date (Note) -
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Abstract
A device and method that overlays, onto a new colored background a subject clipped from a source video image having a subject moving against a first colored background. A clipping key KD is calculated which makes it possible to separate the color space representing the image into three regions, a first region defining a volume representing the first colored background, a second region defining a volume representing the subject, and a third region representing a region of transition between the first colored background and the subject. A video image VD representing the subject moving against the new colored background formed according to the formula: VD=KD.times.subject video+(1-KD).times.background video, where 'subject video' and background video respectively represent a video image containing the subject and the video image of the new colored background. The above described device and method are applicable for use in apparatuses such as, for example, video mixers or autonomous devices for clipping and overlaying video images.
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