Print system printing data while storing under compressed state, and printer for use therein
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United States of America Patent
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Jan 20, 2009
Grant Date -
Mar 9, 2006
app pub date -
Dec 15, 2003
filing date -
Dec 16, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a printing process with a print head having multiple dot formation elements for creating dots, an overlap printing technique that uses at least two dot formation elements for formation of each raster line requires a large memory capacity for storage of dot data. In a printing system of the invention, an image processing device takes charge of a former part of image processing and outputs intermediate data in a state requiring expansion into multiple pixels to a printing device. The printing device expands intermediate data including a target pixel, for which a dot on-off state is to be specified, and specifies the dot on-off state in the target pixel based on the intermediate data. Every time the dot on-off state is specified in each target pixel, intermediate data including the target pixel is expanded. This arrangement does not require the printing device to have a large storage capacity for the image processing. The printing device and the image processing device can thus effectively share the series of image processing, even when the printing device has a small storage capacity and low processing power.
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