Method of producing tint dots with pairs of holladay halftones

Details Method of producing tint dots with pairs of holladay halftones Method of producing tint dots with pairs of holladay halftones

1997-03-07

1998-04-28

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358465, H04N 140

Patent

active

057452504

ABSTRACT:
A halftone generator for generating tint dots that are more circular than typical Holladay dots. Two threshold arrays are used, one that is pixel-centered and one that is interstice-centered. For each signal input level, the one that will produce a more circular dot will be selected by a look-up table driven by the image signal input. A single array version can also be used. The stored array has pixel-centered thresholds at one end and interstice-centered thresholds at the other. The circuit can either choose an array output or an inverted array output to generate either pixel-centered or interstice-centered light and dark coverage.

REFERENCES:
patent: 4185304 (1980-01-01), Holladay
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4903123 (1990-02-01), Kawamura et al.
patent: 5598204 (1997-01-01), Harrington
patent: 5649073 (1997-07-01), Knox et al.

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