Method and system for forming multi-level halftone images from a

Details Method and system for forming multi-level halftone images from a Method and system for forming multi-level halftone images from a

1995-01-26

1998-04-21

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, 358534, 358523, H04N 140, H04N 146

Patent

active

057424055

ABSTRACT:
A method for forming a multi-level halftone image from an input digital image having a plurality of pixels so that visibility of halftone patterns is minimized; comprises the steps of transforming input pixel values which represent the tone level of each pixel into modified pixel values which are approximately linear with perceived lightness; applying a multi-level halftoning process to the modified pixel values to produce halftone pixel values having a reduced number of tone levels which are uniformly distributed with respect to the modified pixel values; and transforming the halftone pixel values into output pixel values for permitting an output device to display the digital image so that visibility of halftone patterns is minimized.

REFERENCES:
patent: 4920501 (1990-04-01), Sullivan et al.
patent: 4962542 (1990-10-01), Klees
patent: 5077615 (1991-12-01), Tsuji
patent: 5107346 (1992-04-01), Bowers et al.
patent: 5109282 (1992-04-01), Peli
patent: 5111310 (1992-05-01), Parker et al.
patent: 5150429 (1992-09-01), Miller et al.
patent: 5210623 (1993-05-01), Weldy
patent: 5214517 (1993-05-01), Sullivan et al.
patent: 5243443 (1993-09-01), Eschbach
patent: 5267054 (1993-11-01), Chang et al.
patent: 5289294 (1994-02-01), Fujisawa
patent: 5291311 (1994-03-01), Miller
patent: 5307426 (1994-04-01), Kanno et al.
patent: 5323247 (1994-06-01), Parker et al.
patent: 5339171 (1994-08-01), Fujisawa et al.
patent: 5341228 (1994-08-01), Parker et al.
patent: 5359430 (1994-10-01), Zhang
R. S. Gentile, E. Walowit and J. P. Allebach, "Quantization and Multilevel Halftoning of Color Images for Near Original Image Quality", J. Opt. Soc. Am. A 7, 1019-1026 (1990).
"Digital Halftoning", R. Ulichney, MIT Press, Cambridge, MA 1987.

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