Method of hybrid halftone printing by limiting the number of gra

Details Method of hybrid halftone printing by limiting the number of gra Method of hybrid halftone printing by limiting the number of gra

1992-11-23

1995-04-11

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346108, 347240, H04N 121, G01D 942

Patent

active

054063795

ABSTRACT:
A hybrid halftone cell selection method enables selection of gray levels in halftone printing algorithms to minimize the effects of noise resulting in nonuniformities, such as, for example, halftone banding. The method requires selection of hybrid halftone cells possessing structures wherein the total number of gray pixels are limited. The number of gray pixels having any given intermediate reflectance level in any halftone cell is also limited. The cell selection method thus reduces the number of TRC gray steps to some minimum required number by eliminating the most noise sensitive cells (i.e. those cells having the highest percentage of gray level pixels). The intermediate reflectance values of the gray pixels in the selected cells are then selected to produce uniform gray steps and reduce variability in the TRC.

REFERENCES:
patent: 4868587 (1989-09-01), Loce et al.
patent: 4963900 (1990-10-01), Henderson et al.
patent: 5276535 (1994-01-01), Levien

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