Image half-tone processor and method thereof

Details Image half-tone processor and method thereof Image half-tone processor and method thereof

2005-05-24

2005-05-24

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003080, C358S003260

Reexamination Certificate

active

06897981

ABSTRACT:
A primary binary image is converted into a weighted multivalued image with pixel values weighted. An upper shift-inverting unit inverts the pixel values, shifts them upward by one dot, and thus converts the primary binary image into an inverted upper-shifted image. A lower shift inverting unit inverts the pixel values, shifts them downward by one dot, and thus converts the primary binary image into an inverted lower-shifted image. A right shift inverting unit inverts the pixel values, shifts them rightward by one dot, and thus converts the primary binary image into an inverted right-shifted image. A left shift inverting unit inverts the pixel values, shifts them leftward by one dot, and thus converts the primary binary image into an inverted left-shifted image. A gradation processing unit subtracts the inverted upper-shifted image, inverted lower-shifted image, inverted right-shifted image and inverted left-shifted image from the weighted multivalued image, thereby synthesizing these pieces of image data. The primary binary image is thus converted into the half-tone image with gradations containing half-tones.

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