Device and method for determining a key for clipping a subject moving against a colored background
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United States of America Patent
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May 11, 1999
Grant Date -
N/A
app pub date -
Nov 25, 1996
filing date -
Nov 23, 1995
priority date (Note) -
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Abstract
The invention relates to a method for determining a key KD for clipping a subject moving against a colored background, the said key making it possible to separate the color space into three regions, a first region defining a volume representing the colored background, a second region defining a volume representing the subject and a third region defining a transition region between the colored background and the subject, where the device and method defines the volume representing the colored background in the form of a cone of aperture angle .alpha. whose axis of symmetry (W) passes through the achromic and zero-luminance point of the color space and a point representing the color of the colored background. The invention also relates to any type of electronic apparatus implementing the abovementioned device and method, such as video mixers or autonomous devices for clipping and overlaying video images.
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