Mixing a graphics signal and a video signal
AssigneeU.S. Philips Corporation
InventorsEvert J. Pol, Marinus Van Splunter
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Abstract
In 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 (CLUT) in which color values (R, G, B) are stored, the number of color values stored for each mixing ratio depends on the mixing ratio so as to obtain an optimum filling of the color look-up table.
Claims7
A method of storing color values and mixing factors in a color look-up table, characterized in that the method comprises the steps:
- determining a number of color values for each of the mixing factors in dependence on the respective mixing factor;
- and
- storing each of the numbers of color values and each respective mixing factor in the color look-up table.
A method of mixing a graphics signal and a video signal in a mixing ratio, said method including the step:
- obtaining the graphics signal and a mixing factor by addressing a color look-up table in which color values and mixing factors are stored,
- characterized in that said color look-up table contains a different number of color values for each mixing factor, wherein the number of color values stored for each mixing factor depends on the respective mixing factor.
A device for mixing a graphics signal and a video signal in a mixing ratio, said device comprising:
- a color look-up table in which color values and mixing factors are stored;
- means for addressing the color look-up table for obtaining the graphics signal and the mixing factor;
- and
- means for mixing the obtained graphics signal with the video signal in the mixing ratio using the obtained mixing factor, characterized in that the color look-up table contains a different number of color values for each mixing factor, wherein the number of color values for each mixing factor depends on the respective mixing factor.
A device for mixing a graphics signal and a video signal in a mixing ratio, said device comprising:
- a color look-up table in which color values and mixing factors are stored;
- means for addressing the color look-up table for obtaining the graphics signal and the mixing factor;
- and
- means for mixing the obtained graphics signal with the video signal in the mixing ratio using the obtained mixing factor, characterized in that the color look-up table contains a different number of color values for each mixing factor, wherein the number of color values for each mixing factor depends on the respective mixing factor,
- wherein the mixing means multiplies the graphic signal by the obtained mixing factor, and wherein the number of color values stored for each mixing factor depends on the third power of the respective mixing factor.
A device for mixing a graphics signal and a video signal in a mixing ratio, said device comprising:
- a color look-up table in which color values and mixing factors are stored;
- means for addressing the color look-up table for obtaining the graphics signal and the mixing factor;
- and
- means for mixing the obtained graphics signal with the video signal in the mixing ratio using the obtained mixing factor, characterized in that the color look-up table contains a different number of color values for each mixing factor, wherein the number of color values for each mixing factor depends on the respective mixing factor,
- wherein the color values include green, red and blue color values, and wherein a number of different green color values is equal to or exceeds a number of different red color values, and the number of different red color values is equal to or exceeds a number of different blue color values.
Dependencies are inferred from the claim text.