Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-03-07
2006-03-07
Lee, Thomas D. (Department: 2624)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003140
Reexamination Certificate
active
07009731
ABSTRACT:
There is provided an image processing apparatus employing an error diffusion method capable of preventing a pseudo contour attributable to a delayed dot. The image processing apparatus receives an error diffused from a neighboring pixel and corrects a value (an input value of 0 to 1) of a pixel to be processed before it reduces a tone. Then a subtracter calculates an error associated with the tone reduction, which is diffused to a neighboring pixel. Herein, only for an input value of no less than 0.5 an inversion portion multiplies by −1 an error from a neighboring pixel and an error to a neighboring pixel. Thus a dot can be free of delay to prevent a pseudo contour.
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Brinich Stephen
Lee Thomas D.
McDermott & Will & Emery
Minolta Co. , Ltd.
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