Halftone dot formation method, halftone dot formation...

Details Halftone dot formation method, halftone dot formation... Halftone dot formation method, halftone dot formation...

2004-10-27

2008-11-25

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003130

Reexamination Certificate

active

07457004

ABSTRACT:
Halftone cells each serving as a unit for formation of a dot are arranged in irregular shapes at random and divided into two groups. The halftone cells (720) in the first group are fewer than the halftone cells (730) in the second group and dispersed, and the area of each of the halftone cells (720) in the first group is set larger than that in the second group. The dot growth speed of the halftone cells (720) in the first group is higher than that of the halftone cells (730) in the second group. This allows formation of fine halftone dots consisting of the halftone cells in the first and second groups, and it is possible to reduce banding appearing in a main scan direction during recording of the halftone dots, with low-frequency components in spatial frequency of the halftone dots caused by the halftone cells (720) in the first group.

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IRI, “Separate Volume of ‘Bit’”, Computational Geometry and Geographic Information Technology, Kyoritsu Shuppan Co., Ltd. Sep. 10, 1986, pp. 163 to 168.

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