Apparatus and method for blending graphics and video surfaces
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United States of America Patent
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Feb 21, 2006
Grant Date -
Jul 8, 2004
app pub date -
Nov 13, 2003
filing date -
Nov 9, 1998
priority date (Note) -
In Force
status (Latency Note)
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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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