Method and system for inter-channel clock frequency selection with periodic halftoning

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United States of America Patent

APP PUB NO 20060274338A1
SERIAL NO

11146195

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Abstract

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At least two different pixel clock frequencies or pixel pitches are used when generating an image. They are used with periodic halftone patterns in a color scanning printing process. By using different clock frequencies for the different color separations, more options for screen geometry are available, and therefore new screen sets with desirable moire behavior are possible. This is especially important on low resolution devices, such as 1200 dpi and below. Here there are a limited number of rational tangent screen geometries that are available and moire canceling or moire averting combinations are scarce. The different pixel clock frequency are used when writing at least two color channels in order to provide otherwise unavailable halftone geometries.

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Patent Owner(s)

Patent OwnerAddress
MONOTYPE IMAGING INC600 UNICORN PARK DRIVE WOBURN MA 01801

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Crounse, Kenneth R Somerville, MA 98 952
Levantovsky, Vladimir North Andover, MA 16 337

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