DE68902662D1 - Verarbeitungsgeraet fuer zweipegelsignale zur bilddarstellung. - Google Patents
Verarbeitungsgeraet fuer zweipegelsignale zur bilddarstellung.Info
- Publication number
- DE68902662D1 DE68902662D1 DE8989302732T DE68902662T DE68902662D1 DE 68902662 D1 DE68902662 D1 DE 68902662D1 DE 8989302732 T DE8989302732 T DE 8989302732T DE 68902662 T DE68902662 T DE 68902662T DE 68902662 D1 DE68902662 D1 DE 68902662D1
- Authority
- DE
- Germany
- Prior art keywords
- processing device
- image display
- level signals
- signals
- level
- 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
- H04N1/4052—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
- H04N1/4053—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions with threshold modulated relative to input image data or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63066585A JPH01238373A (ja) | 1988-03-18 | 1988-03-18 | 画像信号処理装置 |
JP63260803A JPH02107062A (ja) | 1988-10-17 | 1988-10-17 | 画信号処理装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE68902662D1 true DE68902662D1 (de) | 1992-10-08 |
DE68902662T2 DE68902662T2 (de) | 1993-01-28 |
Family
ID=26407779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8989302732T Expired - Fee Related DE68902662T2 (de) | 1988-03-18 | 1989-03-20 | Verarbeitungsgeraet fuer zweipegelsignale zur bilddarstellung. |
Country Status (3)
Country | Link |
---|---|
US (1) | US4924322A (de) |
EP (1) | EP0333520B1 (de) |
DE (1) | DE68902662T2 (de) |
Families Citing this family (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4969052A (en) * | 1988-05-11 | 1990-11-06 | Canon Kabushiki Kaisha | Image processing method and apparatus |
US5107346A (en) * | 1988-10-14 | 1992-04-21 | Bowers Imaging Technologies, Inc. | Process for providing digital halftone images with random error diffusion |
US5162925A (en) * | 1988-11-17 | 1992-11-10 | Canon Kabushiki Kaisha | Color image processor capable of performing masking using a reduced number of bits |
US5201013A (en) * | 1989-04-24 | 1993-04-06 | Ezel, Inc. | Dither processing method |
WO1991006172A1 (en) * | 1989-10-16 | 1991-05-02 | Bowers Imaging Technologies, Inc. | Process for providing digital halftone images with random error diffusion |
US5051841A (en) * | 1989-10-16 | 1991-09-24 | Bowers Imaging Technologies, Inc. | Process for providing digital halftone images with random error diffusion |
CA2028092C (en) * | 1989-10-23 | 1996-08-06 | Yuji Tanaka | Binary image processing apparatus |
US5060284A (en) * | 1990-03-23 | 1991-10-22 | Eastman Kodak Company | Adaptive error diffusion thresholding for document images |
US5109282A (en) * | 1990-06-20 | 1992-04-28 | Eye Research Institute Of Retina Foundation | Halftone imaging method and apparatus utilizing pyramidol error convergence |
DE69126250T2 (de) * | 1990-07-20 | 1997-10-09 | Canon Kk | Vorrichtung zur Bildverarbeitung |
US5140432A (en) * | 1990-09-12 | 1992-08-18 | Hewlett-Packard Company | Method and system for printing in one or more color planes with improved control of error diffusion |
US5196942A (en) * | 1990-09-17 | 1993-03-23 | Xerox Corporation | System and method for determining picture element values |
EP0476220A3 (en) * | 1990-09-20 | 1993-01-27 | Toyo Ink Mfg. Co., Ltd. | Color image information processing method |
US5208871A (en) * | 1990-10-19 | 1993-05-04 | Xerox Corporation | Pixel quantization with adaptive error diffusion |
US5172247A (en) * | 1990-10-24 | 1992-12-15 | Eastman Kodak Company | High speed digital error diffusion process for continuous tone image-to-binary image conversion |
US5341228A (en) * | 1990-12-04 | 1994-08-23 | Research Corporation Technologies | Method and apparatus for halftone rendering of a gray scale image using a blue noise mask |
US5475497A (en) * | 1991-02-22 | 1995-12-12 | At&T Ipm Corp. | Two-dimensional display model-based halftoning |
JP2500834B2 (ja) * | 1991-09-05 | 1996-05-29 | ゼロックス コーポレイション | 画素値の量子化方法及び装置 |
US5331430A (en) * | 1991-10-11 | 1994-07-19 | R.R. Donnelley & Sons Company | Electronic high-fidelity screenless conversion system |
US5226096A (en) * | 1991-10-11 | 1993-07-06 | Xerox Corporation | Digital halftoning with selectively applied dot-to-dot error diffusion |
US5268774A (en) * | 1991-11-27 | 1993-12-07 | Xerox Corporation | Halftoning with enhanced dynamic range and edge enhanced error diffusion |
US5243443A (en) * | 1991-12-06 | 1993-09-07 | Xerox Corporation | Halftoning with error feedback and image dependent enhancement |
US5260807A (en) * | 1992-06-05 | 1993-11-09 | Eastman Kodak Company | Method and apparatus for imbedding controlled structure for gray scale rendering |
US5337160A (en) * | 1992-07-01 | 1994-08-09 | Hewlett-Packard | Error diffusion processor and method for converting a grey scale pixel image to a binary value pixel image |
US5335089A (en) * | 1992-07-29 | 1994-08-02 | R. R. Donnelley & Sons Company | Electronic high-fidelity screenless conversion system and method using a separable filter |
US5374997A (en) * | 1992-07-31 | 1994-12-20 | Xerox Corporation | High addressability error diffusion with minimum mark size |
US5321525A (en) * | 1992-12-14 | 1994-06-14 | Xerox Corporation | Clustered halftoning with dot-to-dot error diffusion |
US5452403A (en) * | 1992-12-23 | 1995-09-19 | Eastman Kodak Company | Process for selecting output levels for multi-level halftone in the presence of an unstable display device |
US5325211A (en) * | 1993-01-04 | 1994-06-28 | Xerox Corporation | Error diffusion with output and input based feedback |
JP3171993B2 (ja) * | 1993-05-24 | 2001-06-04 | キヤノン株式会社 | 画像処理方法及び装置 |
US5521989A (en) * | 1993-08-05 | 1996-05-28 | Xerox Corporation | Balanced error diffusion system |
US5353127A (en) * | 1993-12-15 | 1994-10-04 | Xerox Corporation | Method for quantization gray level pixel data with extended distribution set |
US5467201A (en) * | 1994-05-31 | 1995-11-14 | Xerox Corporation | Iterative error diffusion system |
US6427030B1 (en) | 1994-08-03 | 2002-07-30 | Xerox Corporation | Method and system for image conversion utilizing dynamic error diffusion |
US5535019A (en) * | 1994-09-15 | 1996-07-09 | Xerox Corporation | Error diffusion halftoning with homogeneous response in high/low intensity image regions |
US5493416A (en) * | 1994-10-31 | 1996-02-20 | Xerox Corporation | Method combining error diffusion and traditional halftoning with arbitrary screen orientation |
JPH08204971A (ja) * | 1994-10-31 | 1996-08-09 | Xerox Corp | 予測符号化と誤差拡散を用いた画像圧縮方法 |
US5543935A (en) * | 1994-11-18 | 1996-08-06 | Xerox Corporation | Halftoning method using space filling curves |
US5710836A (en) * | 1994-12-01 | 1998-01-20 | Xerox Corporation | System and apparatus for tonal reproduction adjustment in an error diffusion process |
US6307647B1 (en) * | 1995-05-05 | 2001-10-23 | Lexmark International, Inc. | Digital halftoning with error diffusion |
US5809177A (en) * | 1996-06-06 | 1998-09-15 | Xerox Corporation | Hybrid error diffusion pattern shifting reduction using programmable threshold perturbation |
US6678073B1 (en) | 2000-02-08 | 2004-01-13 | Oak Technology, Inc. | Error diffusion method and apparatus |
JP2003116015A (ja) * | 2001-10-04 | 2003-04-18 | Canon Inc | 画像処理装置及び方法及びコンピュータプログラム及びコンピュータ可読記憶媒体 |
US7518754B2 (en) * | 2005-08-18 | 2009-04-14 | Lexmark International, Inc. | Apparatus and method for error diffusion with dither |
US7826096B2 (en) | 2005-09-16 | 2010-11-02 | Fujifilm Corporation | Image processing method and image recording apparatus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4554593A (en) * | 1981-01-02 | 1985-11-19 | International Business Machines Corporation | Universal thresholder/discriminator |
JPS60253368A (ja) * | 1983-11-10 | 1985-12-14 | Dainippon Screen Mfg Co Ltd | 複製画像記録表示等に於けるjag除去方法 |
US4599656A (en) * | 1984-02-21 | 1986-07-08 | International Business Machines Corporation | Processing of gray scale image pels to facilitate data compression |
US4593325A (en) * | 1984-08-20 | 1986-06-03 | The Mead Corporation | Adaptive threshold document duplication |
US4890167A (en) * | 1986-10-17 | 1989-12-26 | Matsushita Electric Industrial Co., Ltd. | Apparatus for processing image signal |
JPH03141526A (ja) * | 1989-10-26 | 1991-06-17 | Matsushita Electric Works Ltd | 遅れスイッチ |
-
1989
- 1989-03-17 US US07/324,780 patent/US4924322A/en not_active Expired - Lifetime
- 1989-03-20 EP EP89302732A patent/EP0333520B1/de not_active Expired
- 1989-03-20 DE DE8989302732T patent/DE68902662T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0333520B1 (de) | 1992-09-02 |
EP0333520A3 (en) | 1989-12-13 |
EP0333520A2 (de) | 1989-09-20 |
DE68902662T2 (de) | 1993-01-28 |
US4924322A (en) | 1990-05-08 |
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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) | ||
8339 | Ceased/non-payment of the annual fee |