Apparatus and method for blending graphics and video surfaces

Details Apparatus and method for blending graphics and video surfaces Apparatus and method for blending graphics and video surfaces

2006-02-21

2006-02-21

Luu, Matthew (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S637000, C345S639000

Reexamination Certificate

active

07002602

ABSTRACT:
A graphics integrated circuit chip is used in a set-top box for controlling a television display. The graphics chip processes analog video input, digital video input, and graphics input. The chip blends graphics and video information by various graphics windows using alpha values for the windows, alpha values per pixel, or both. The chip calculates a composite alpha value based on the window's alpha values and the alpha values per pixel. Blended graphics and video may then be composited using the composite alpha value.

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