Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1990-09-18
1993-09-14
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
358 30, 358166, G09G 500
Patent
active
052453278
ABSTRACT:
The present invention provides a contrast enhancing method and circuit for mapping color signals into signals for driving a display which is capable of displaying shades of gray. With the present invention a preliminary translation is first made between a foreground-background color combination and the various shades of gray that can be displayed. The contrast or separation between the foreground level of gray and the background level of gray produced by this preliminary translation is then compared to parameters set by the operator. If the preliminary translation provides the desired degree of separation between the foreground and the background gray levels, no further translation takes place; however, if the desired degree of separation was not achieved by the preliminary translation, the system forces further separation between the foreground and background by taking the following action: (a) if the background was darker than the foreground, the background is made still darker and/or the foreground is made still lighter (b) if the background was lighter than the foreground the background is made still lighter and/or the foreground is made still darker.
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Pleva Robert M.
Randall Martin
Chips and Technologies, Incorporated
Hjerpe Richard
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