Multi-pass 4:2:0 subpicture blending

Details Multi-pass 4:2:0 subpicture blending Multi-pass 4:2:0 subpicture blending

2000-01-07

2008-08-19

Good-Johnson, Motilewa (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S629000

Reexamination Certificate

active

07414632

ABSTRACT:
A circuit for blending video signals and subpicture signals is provided. The circuit includes a palette to output at least one subpicture value based on a palette index. The circuit also includes an alpha-blend unit coupled to the subpicture palette to blend a set of luminance values of a video signal with a set of luminance values of a subpicture signal in one pass and to blend a set of chrominance values of a video signal with a set of chrominance values of the subpicture signal in a separate pass, the luminance and chrominance values are provided to the alpha-blend unit in a planar format. The video signals may be provided and blended in a YUV 4:2:0 format. In addition, a single dual-purpose palette can be used for both texturing and alpha-blending.

REFERENCES:
patent: 5642137 (1997-06-01), Kitazumi
patent: 5651104 (1997-07-01), Cosman
patent: 5734802 (1998-03-01), Maltz et al.
patent: 5852444 (1998-12-01), Lippincott
patent: 5896136 (1999-04-01), Augustine et al.
patent: 6208350 (2001-03-01), Herrera
patent: 6678006 (2004-01-01), Velez et al.
patent: 9923831 (1999-05-01), None

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