Method and apparatus for combining video images on a pixel basis
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United States of America Patent
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Jul 2, 1996
Issued Date -
N/A
app pub date -
Aug 8, 1994
filing date -
Jul 22, 1992
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Abstract
A method and apparatus for raster-scanned video graphics systems where clocked digital video words from a plurality of sources are combined so that, at each video clock time, a word is chosen from one of the ports to light the current pixel on a display. There is an input port for each video source and a gate associated with each input port for passing or inhibiting a binary word. A decision at each video clock time chooses a word from one of the ports and passes it to an output port which leads to a video display or palette device. This decision is based on the data content of the current digital video words at the input ports.
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