Electrophotographic image forming apparatus and image...

Details Electrophotographic image forming apparatus and image... Electrophotographic image forming apparatus and image...

2006-03-07

2006-03-07

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Plotter

C358S001800, C358S003060, C358S003120, C358S003230, C358S001160

Reexamination Certificate

active

07009729

ABSTRACT:
An electrophotographic image forming apparatus uses a halftone spot consisting of multiple dot images formed in pixel areas so as to represent a gray scale and to reproduce an image. It has a halftone processor for generating image reproduction data for each pixel by referring to a transformation table wherein gray level data for the image and correlated image reproduction data are stored. The transformation table includes first look-up tables that each store gray level data and correlated first image reproduction data, including size data for virtual dots, each of which corresponds to one of the dot images, second look-up tables that each store gray level data and correlated second image reproduction data, including size data for virtual dots, each of which corresponds to one of the dot images, and a pattern matrix, elements of which are correlated with multiple pixels in a predetermined area of an image and each indicate one of the first look-up tables and one of the second look-up tables that are to be referred to.

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