Facsimile and static presentation processing – Natural color facsimile – Image reproduction
Patent
1996-03-04
1999-08-03
Wong, Peter S.
Facsimile and static presentation processing
Natural color facsimile
Image reproduction
358296, 358401, 358444, 347135, 347253, H04N 1407
Patent
active
059332557
ABSTRACT:
In a digital image forming apparatus, when a latent image is formed on a photoconductor by modulating optical intensity of laser beam, the laser beam is emitted in a period of a duty ratio while modulated according to image data, and the image is formed on a sheet of paper. This process is repeated for four colors for a color document. The duty ratio, defined as a ratio of a light-emitting time of a light exposing the photoconductor to a period for exposing a dot, is changed in the same document. For example, the light emission timing pattern is changed between odd and even lines. In another example, the light-emission timings may be changed at least for one of the reproduction colors. The light-emission timing patterns may be provided for each of reproduction colors. The light-emission timing patterns may be changed to have a constant or different screening angle between colors. Image quality of a half-tone image is improved by using such patterns.
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Hada Yoshinobu
Hirata Katsuyuki
Katori Kentaro
Kouzaki Masahiro
Jardieu Derek J.
Minolta Co. , Ltd.
Wong Peter S.
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