Image processing apparatus for converting image data by unit...

Details Image processing apparatus for converting image data by unit... Image processing apparatus for converting image data by unit...

2004-08-06

2008-08-19

Tran, Douglas Q (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003050, C358S003020

Reexamination Certificate

active

07414756

ABSTRACT:
The image processing apparatus or the printing device of the present invention forms units by grouping adjacent multiple-pixels and converts the image data to the dot data representing dot on/off state for each of pixels.The apparatus stores the dot data in a condition enabling identification of the dot on/off state for at least one of pixels within the previously converted units. When the apparatus converts the image data to the dot data by a unit,The apparatus serially specifies a interested pixel, within a unit to be converted to the dot data, for determination of dot on/off state. Then the apparatus determines the dot on/off state for the interested pixel, according to a characteristic that controls the proportion of a number of dots formed at the predetermined location of the unit against a number of all dots into a predetermined range. It prevents cyclical patterns from becoming visible and degrading image quality.

REFERENCES:
patent: 6870641 (2005-03-01), Kakutani
patent: 2000-050066 (2000-02-01), None
patent: 2002-185789 (2002-06-01), None
patent: 2005-081770 (2005-03-01), None
Abstract of Japanese Patent Publication No. 2002-185789, Pub. Date: Jun. 28, 2002, Patent Abstracts of Japan.
Abstract of Japanese Patent Publication No. 2000-050066, Pub. Date: Feb. 18, 2000, Patent Abstracts of Japan.
Abstract of Japanese Patent Publication No. 2005-081770 Pub. Date: Mar. 31, 2005, Patent Abstracts of Japan.

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