DE69406741D1 - Verfahren zur Herstellung eines frequenzmodulierten Rasterbildes - Google Patents
Verfahren zur Herstellung eines frequenzmodulierten RasterbildesInfo
- Publication number
- DE69406741D1 DE69406741D1 DE69406741T DE69406741T DE69406741D1 DE 69406741 D1 DE69406741 D1 DE 69406741D1 DE 69406741 T DE69406741 T DE 69406741T DE 69406741 T DE69406741 T DE 69406741T DE 69406741 D1 DE69406741 D1 DE 69406741D1
- Authority
- DE
- Germany
- Prior art keywords
- producing
- frequency
- raster image
- modulated raster
- modulated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11625493A | 1993-09-02 | 1993-09-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69406741D1 true DE69406741D1 (de) | 1997-12-18 |
DE69406741T2 DE69406741T2 (de) | 1998-06-18 |
Family
ID=22366109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69406741T Expired - Lifetime DE69406741T2 (de) | 1993-09-02 | 1994-08-16 | Verfahren zur Herstellung eines frequenzmodulierten Rasterbildes |
Country Status (4)
Country | Link |
---|---|
US (1) | US6278802B1 (de) |
EP (1) | EP0642258B1 (de) |
JP (1) | JPH0785272A (de) |
DE (1) | DE69406741T2 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0642259B1 (de) * | 1993-09-03 | 1999-12-29 | Agfa-Gevaert N.V. | Verfahren zur Herstellung eines frequenzmodulierten Halbtonrasters |
US5689623A (en) * | 1995-03-27 | 1997-11-18 | Optronics International Corporation | Spread spectrum digital screening |
EP0805585A1 (de) * | 1996-04-25 | 1997-11-05 | Schablonentechnik Kufstein Aktiengesellschaft | Verfahren zur Herstellung einer Grautonschablone |
SE9602696L (sv) * | 1996-07-01 | 1998-01-02 | Forskarpatent I Linkoeping Ab | Snabbt rastreringsförfarande |
US6690837B1 (en) | 1998-11-03 | 2004-02-10 | Agfa-Gevaert | Screening method for overlapping sub-images |
US6906825B1 (en) * | 1999-06-14 | 2005-06-14 | Toshiba Tec Kabushiki Kaisha | Image processor and color image processor |
US7072072B1 (en) * | 2000-05-02 | 2006-07-04 | Xerox Corporation | Color rendering optimized for text and line art |
US6710778B2 (en) * | 2001-02-12 | 2004-03-23 | Lexmark International, Inc. | Method for halftoning using a difference weighting function |
US7139101B2 (en) * | 2002-10-31 | 2006-11-21 | Xerox Corporation | Anisotropic stochastic screen |
US7444027B2 (en) * | 2002-11-12 | 2008-10-28 | Hewlett-Packard Development Company, L.P. | Methods, devices, and systems for creating and compressing multi-level halftones |
US7830569B2 (en) * | 2006-03-31 | 2010-11-09 | Eastman Kodak Company | Multilevel halftone screen and sets thereof |
US7626730B2 (en) * | 2006-03-31 | 2009-12-01 | Eastman Kodak Company | Method of making a multilevel halftone screen |
WO2017222564A1 (en) | 2016-06-24 | 2017-12-28 | Hewlett-Packard Development Company, L.P. | Introducing visual noise in a flat tint area of a printed image |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4004079A (en) * | 1975-11-14 | 1977-01-18 | Optronics International, Inc. | Method and apparatus for dual resolution photographic reproduction of line and continuous tone graphic materials |
JPS57120937A (en) * | 1981-01-21 | 1982-07-28 | Dainippon Screen Mfg Co Ltd | Formation of halftone plate image |
ATE14164T1 (de) * | 1981-09-12 | 1985-07-15 | Hell Rudolf Dr Ing Gmbh | Verfahren zur herstellung von druckformen mittels unregelmaessig verteilter druckpunkte. |
US4507685A (en) * | 1982-06-25 | 1985-03-26 | Canon Kabushiki Kaisha | Image recording device |
US4736254A (en) * | 1984-11-22 | 1988-04-05 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for generating pseudo-halftone dots by comparing gray scale values of an original with dither threshold values stored in cells of a matrix array divided into imaginary matrices of elemental areas each containing one cell |
US5105280A (en) * | 1989-01-12 | 1992-04-14 | Minolta Camera Kabushiki Kaisha | Image forming device which can form an image by printing a plurality of pixel unit areas which are composed of multiple sub pixels |
US5041920A (en) * | 1989-11-15 | 1991-08-20 | Xerox Corporation | Image halftone generation by static RAM look-up table |
JP3154240B2 (ja) * | 1990-02-07 | 2001-04-09 | ネクスプレス ソルーションズ エル エル シー | 相関最小視覚変調パターンによるディジタル中間調調色 |
US5111310A (en) * | 1990-12-04 | 1992-05-05 | Research Technologies Corporation, Inc. | Method and apparatus for halftone rendering of a gray scale image using a blue noise mask |
US5438431A (en) * | 1992-05-21 | 1995-08-01 | Ostromoukhov; Victor B. | Method and apparatus for generating digital halftone images using a rotated dispersed dither matrix |
US5291311A (en) * | 1992-06-29 | 1994-03-01 | Eastman Kodak Company | Apparatus and method for generating multi-level output values for pixels in a halftone cell |
-
1994
- 1994-08-16 EP EP94202329A patent/EP0642258B1/de not_active Expired - Lifetime
- 1994-08-16 DE DE69406741T patent/DE69406741T2/de not_active Expired - Lifetime
- 1994-09-01 JP JP6234434A patent/JPH0785272A/ja active Pending
-
1997
- 1997-10-15 US US08/950,468 patent/US6278802B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US6278802B1 (en) | 2001-08-21 |
EP0642258A3 (de) | 1995-06-07 |
DE69406741T2 (de) | 1998-06-18 |
EP0642258B1 (de) | 1997-11-12 |
JPH0785272A (ja) | 1995-03-31 |
EP0642258A2 (de) | 1995-03-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: AGFA GRAPHICS N.V., MORTSEL, BE |