Device and method for determining a key for clipping a subject m

Details Device and method for determining a key for clipping a subject m Device and method for determining a key for clipping a subject m

1996-11-25

1999-05-11

Peng, John K.

Television

Image signal processing circuitry specific to television

Special effects

348586, 348587, 348588, 345118, 345168, 358537, 358538, 358540, 358 22CK, 382284, H04N9/75

Patent

active

059033185

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.

REFERENCES:
patent: 5003491 (1991-03-01), Heckt
patent: 5051828 (1991-09-01), Chaplin
patent: 5117283 (1992-05-01), Kroos
patent: 5202762 (1993-04-01), Fellinger
patent: 5355174 (1994-10-01), Mishima
patent: 5574511 (1996-11-01), Yang
patent: 5657395 (1997-08-01), Hirota
Digital Chroma-Key, by V. G. Devereux, BBC Research Department, UK, Sep. 21-25, 1984, International Broadcasting Convention, pp. 148-152.

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