Clustered dot and line multilevel halftoning for electrographic

Details Clustered dot and line multilevel halftoning for electrographic Clustered dot and line multilevel halftoning for electrographic

1997-02-13

1999-08-31

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358459, H04N 140

Patent

active

059464534

ABSTRACT:
A method is disclosed for rendering monochrome or colored continuous tone images by a system having restricted continuous tone rendering capabilities, such as electrographic printers capable of printing more than two density levels on each addressable micro dot. A method for preferred halftone dot growth is described, starting from isolated dots arranged along base lines and auxiliary lines, evolving to high density lines along the base lines and approximating full continuous tone rendition for high density regions. Preferred arrangements for the orientation, spacing and absolute location of the base lines and auxiliary lines are disclosed and a method to generate preferred arrangements. A moire free combination of three halftone images is described for the reproduction of color images. A method to select a restricted set of energy levels to obtain linear reflectance response is disclosed. Halftone cells are arranged in supercells to improve the density resolution of the system.

REFERENCES:
patent: 5055923 (1991-10-01), Kitagawa et al.
patent: 5337167 (1994-08-01), Hiratsuka et al.
patent: 5341226 (1994-08-01), Shiau
patent: 5371612 (1994-12-01), Sakamoto
patent: 5381241 (1995-01-01), Kawanaka et al.

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