Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-09-28
1995-10-31
Bayerl, Raymond J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358456, H04N 140, H04N 152
Patent
active
054637201
ABSTRACT:
A technique, including apparatus and accompanying methods, for use in a tile oriented digital screener for suppressing screener induced image artifacts through use of "blue noise" based selection among a number of different halftone dot fonts. Specifically, in producing a screened halftone dot pattern for any density value, a two-dimensional seamless matrix of blue noise correlated uniformly distributed integer values is used to select one of a number of different halftone dot fonts that will be produced for any halftone density value. The amount of blue noise in the matrix is specifically tailored, both in amplitude and frequency response, to substantially suppress all low frequency image artifacts and place resulting screening errors at sufficiently high spatial frequencies so as to render these errors essentially invisible to a human observer. Across identical density values, these fonts illustratively contain symmetric edge variations, and substantially constant dot area and dot center locations. Through use of this technique, any noticeable increase in image granularity is also advantageously avoided.
REFERENCES:
patent: 4185304 (1980-01-01), Holladay
patent: 4267573 (1981-05-01), Chaikin et al.
patent: 4283765 (1981-08-01), Rieger
patent: 4393453 (1983-07-01), Nakano
patent: 4394693 (1983-07-01), Shirley
patent: 4413286 (1983-11-01), Boston
patent: 4437121 (1984-03-01), Taylor et al.
patent: 4449150 (1984-05-01), Kato
patent: 4468688 (1984-08-01), Gabriel et al.
patent: 4468755 (1984-08-01), Iida
patent: 4477802 (1984-10-01), Walter et al.
patent: 4545069 (1985-10-01), Kermisch
patent: 4554638 (1985-11-01), Iida
patent: 4602346 (1986-07-01), Kawakami et al.
patent: 4610026 (1986-09-01), Tabata et al.
patent: 4611349 (1986-09-01), Hou
patent: 4631751 (1986-12-01), Anderson et al.
patent: 4636783 (1987-01-01), Omachi
patent: 4637057 (1987-01-01), Kermisch
patent: 4656664 (1987-04-01), Anderson et al.
patent: 4686580 (1987-08-01), Kato et al.
patent: 4703515 (1987-10-01), Baroody
patent: 4706205 (1987-11-01), Akai et al.
patent: 4712140 (1987-12-01), Mintzer et al.
patent: 4716533 (1987-12-01), Ohmori
patent: 4727430 (1988-02-01), Miwa et al.
patent: 4745576 (1988-05-01), Hasegawa et al.
patent: 4752822 (1988-06-01), Kawamura
patent: 4769640 (1988-09-01), Sato
patent: 4783838 (1988-11-01), Matsunawa
patent: 4790025 (1988-12-01), Inoue et al.
patent: 4790028 (1988-12-01), Ramage
patent: 4809345 (1989-02-01), Tabata et al.
patent: 4829452 (1989-05-01), Kang et al.
patent: 4885786 (1989-12-01), Anderson et al.
patent: 4903147 (1990-02-01), Kanno et al.
patent: 4916545 (1990-04-01), Granger
patent: 4918622 (1990-04-01), Granger et al.
patent: 4959730 (1990-09-01), Tai et al.
patent: 4977458 (1990-12-01), Granger et al.
patent: 4985779 (1991-01-01), Gall
patent: 4987498 (1991-01-01), Shimazaki
patent: 5006938 (1991-04-01), Mita
patent: 5053887 (1991-10-01), Thompson
patent: 5111310 (1992-05-01), Parker et al.
patent: 5313309 (1994-05-01), Tai et al.
patent: 5341228 (1994-08-01), Parker et al.
Proceedings Of The IEEE, vol. 76, No. 1, Jan., 1988, New York, (US); pp. 56-79; R. A. Ulichney "Dithering with Blue Noise"*.
Bayerl Raymond J.
Legree Tracy M.
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