Computer graphics processing and selective visual display system – Display peripheral interface input device
Reexamination Certificate
1997-11-25
2001-08-07
Mengistu, Amare (Department: 2673)
Computer graphics processing and selective visual display system
Display peripheral interface input device
C345S182000
Reexamination Certificate
active
06271826
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for mixing a graphics signal and a video signal, and to a multimedia apparatus comprising such a device.
SUMMARY OF THE INVENTION
It is, inter alia, an object of the invention to provide a graphics/video signal mixing in which an optimum efficiency of hardware elements is achieved. To this end, a first aspect of the invention provides a method of storing color values and a mixing factor into a color look-up table, characterized in that the number of color values stored for each mixing factor depends on the mixing factor. A second aspect of the invention defines a method of mixing a graphics signal and a video signal in a ratio alpha:(1-alpha), where the graphics signal is obtained by addressing a color look-up table in which color values are stored, characterized in that the number of color values stored for each mixing ratio depends on the mixing ratio. A third aspect of the invention defines a device for mixing a graphics signal and a video signal in a ratio alpha:(1-alpha), where the graphics signal is obtained by addressing a color look-up table in which color values are stored, characterized in that the number of color values stored for each mixing ratio depends on the mixing ratio. A fourth aspect of the invention defines a multimedia apparatus comprising a graphics and video signal mixing device as described above, and a display coupled to an output of said mixing device. Advantageous embodiments are defined in the dependent claims.
A primary aspect of the invention provides a method of mixing a graphics signal and a video signal in a ratio alpha:(1-alpha), where the graphics signal is obtained by addressing a color look-up table in which color values are stored, in which the number of color values stored for each mixing ratio depends on the mixing ratio to obtain an optimum filling of the color look-up table. The term “color values” not only covers red, green and blue color values, but also values which represent colors by means of a luminance value and chrominance values.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
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Pol Evert J.
Van Splunter Marinus
Goodman Edward W.
Mengistu Amare
U.S. Philips Corporation
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