Error diffusion of subcells in digital halftoning

Details Error diffusion of subcells in digital halftoning Error diffusion of subcells in digital halftoning

1990-05-21

1991-09-17

Shoop, Jr., William M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358457, 358466, H04N 140

Patent

active

050500007

ABSTRACT:
A system for converting gray-level input data into binary output data and efficiently preserve much of the original sharpness information. The input data is divided into halftone cells which correspond to several pixels in the original image information. The halftone cells are further divided into subcells which correspond to a plurality of pixels in the halftone cell. The subcells are thresholded with a matrix of threshold values to determine which binary pixels are to be rendered. Any error between the rendered pixels and the average density value of the subcell input values is propagated to adjacent subcells. The thresholding of the subcell pixels can use a separate threshold value for the individual pixels or can use an average threshold value for the entire subcell.

REFERENCES:
patent: 4196454 (1980-04-01), Warren
patent: 4258393 (1981-03-01), Ejiri et al.
patent: 4578713 (1986-03-01), Tsao et al.
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4733230 (1988-03-01), Kurihara et al.
patent: 4876611 (1989-10-01), Fischer et al.
patent: 4891710 (1990-01-01), Nakazato et al.

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