Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1995-03-28
1998-01-27
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345149, G09G 510
Patent
active
057126577
ABSTRACT:
An adaptive dithering apparatus analyzes an input video signal as a function of available primary shades and produces a select signal whose value is a function of the desired shade represented by the input video signal and of the available primary shades. A combiner combines the input video signal with a selected one of a plurality of dither signals to generate a dithered input video signal. The one dither signal is selected under the control of the select signal. Finally, an adjustor receives the dithered input video signal, the available shade signal, and the select signal and, under the control of the select signal, adjusts the dithered input video signal to have a value equal to one of the available primary shades. Thus, an input video signal may be dithered with a dither signal that is optimized for dithering an input signal that falls into a particular range of desired shades. That is, a different dither signal may be employed for each possible spacing of adjacent available primary shades. As a result, an overall quantizing transfer function can be achieved which is, on average, linear for all values of the input video signal.
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Second Edition Computer Graphics Principles and Practice, James D. Foley, Andries van Dam, Steven K. Feiner and John F. Hughes, Addison-Wesley Publishing Co., copyright 1987, Cornell University, Program of Computer Graphics, (pp. 563-573).
The Art of Digital Video, Second Edition, John Watkinson, copyright 1990, 1994, British Library Cataloguing in Publication Data, Library of Congress Cataloging in Publication Data, (pp. 139-147).
Eglit Alexander Julian
Han Robin Sungsop
Cirrus Logic Inc.
Hjerpe Richard
Hodes Alan S.
Sekimura Gerald T.
Shaw Steven A.
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