04484187 is referenced by 128 patents and cites 9 patents.

Apparatus and method are disclosed for selecting colors for presentation in a display device such as a CRT. The apparatus includes a pair of video memories that store picture element (pixel) data for presentation at the same location of the display device. A color map, or video look-up table, stores digitally encoded colors that are provided at its output in response to a digital input address. The digital input address is partioned into several portions. Pixel data from the first video memory supplies one portion of the digital input address while pixel data from the second video memory supplies another. Neither video memory has priority in selecting the color presented on the video display although the color map is programmable to give effective priority to either one.

The digital address is further partioned into a third portion to thereby define the color map as a plurality of segments. A data processor selects which segment of the color map is to be addressed by the video memories thereby changing priority and/or color palettes without alteration of the pixel data or the need to reprogram a segment of the color map.

Title
Video overlay system having interactive color addressing
Application Number
6/392001
Publication Number
4484187
Application Date
June 25, 1982
Publication Date
November 20, 1984
Inventor
William S Stoddard
Indianapolis
IN, US
James W Brown
Indianapolis
IN, US
Agent
M A Morra
Assignee
AT&T Bell Laboratories
NJ, US
IPC
G09G 1/28
G09G 1/02
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