CA2019683A1 - Commande de processus pour imprimantes electrostatiques - Google Patents
Commande de processus pour imprimantes electrostatiquesInfo
- Publication number
- CA2019683A1 CA2019683A1 CA2019683A CA2019683A CA2019683A1 CA 2019683 A1 CA2019683 A1 CA 2019683A1 CA 2019683 A CA2019683 A CA 2019683A CA 2019683 A CA2019683 A CA 2019683A CA 2019683 A1 CA2019683 A1 CA 2019683A1
- Authority
- CA
- Canada
- Prior art keywords
- process control
- exposing
- gray level
- level image
- image pixels
- 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.)
- Granted
Links
- 238000004886 process control Methods 0.000 title 1
- 108091008695 photoreceptors Proteins 0.000 abstract 1
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
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
- H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
-
- 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
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
- H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]
-
- 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
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Or Security For Electrophotography (AREA)
- Fax Reproducing Arrangements (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Color Electrophotography (AREA)
- Facsimile Heads (AREA)
- Dot-Matrix Printers And Others (AREA)
- Color, Gradation (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Laser Beam Printer (AREA)
- Facsimile Image Signal Circuits (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US387259 | 1989-07-31 | ||
US07/387,259 US4914455A (en) | 1989-07-31 | 1989-07-31 | Process control for electrostatographic printers |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2019683A1 true CA2019683A1 (fr) | 1991-01-31 |
CA2019683C CA2019683C (fr) | 1994-11-01 |
Family
ID=23529130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002019683A Expired - Fee Related CA2019683C (fr) | 1989-07-31 | 1990-06-22 | Commande de processus pour imprimantes electrostatiques |
Country Status (5)
Country | Link |
---|---|
US (1) | US4914455A (fr) |
EP (1) | EP0411844B1 (fr) |
JP (1) | JP2763185B2 (fr) |
CA (1) | CA2019683C (fr) |
DE (1) | DE69028822T2 (fr) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03165176A (ja) * | 1989-11-22 | 1991-07-17 | Ricoh Co Ltd | 画像記録装置 |
US5221971A (en) * | 1990-11-21 | 1993-06-22 | Polaroid Corporation | Area modulation printing apparatus |
US5170261A (en) * | 1990-11-21 | 1992-12-08 | Polaroid Corporation | Printing method |
EP0514504B1 (fr) * | 1990-11-21 | 1997-04-23 | Polaroid Corporation | Procede d'impression |
JP2718570B2 (ja) * | 1990-11-21 | 1998-02-25 | スターリング ドライ イメイジング,インコーポレイテッド | 印刷装置 |
US5341165A (en) * | 1991-01-16 | 1994-08-23 | Canon Kabushiki Kaisha | Scanning controller for color electrophotographic apparatus |
JP3215894B2 (ja) * | 1992-01-23 | 2001-10-09 | コニカ株式会社 | 画像形成装置 |
US6501492B1 (en) * | 1992-11-13 | 2002-12-31 | Canon Kabushiki Kaisha | Image forming apparatus for outputting image in response to digital image signal |
US5864355A (en) * | 1997-03-20 | 1999-01-26 | Lexmark International, Inc. | Image forming apparatus with laser calibration during ramp-up period of an optical device |
US6657742B1 (en) * | 1997-11-24 | 2003-12-02 | Xerox Corporation | System for printing facsimile jobs with a property profile |
JP2006255970A (ja) * | 2005-03-15 | 2006-09-28 | Ricoh Co Ltd | インクジェットプリンタおよび複写装置 |
US7545333B2 (en) * | 2006-03-16 | 2009-06-09 | Agc Automotive Americas R&D | Multiple-layer patch antenna |
US20090196529A1 (en) * | 2008-02-06 | 2009-08-06 | William Su | System and method for content sensitive document processing |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2017431A1 (de) * | 1970-04-11 | 1971-11-04 | Bosch Elektronik Gmbh | Verfahren zur elektrischen Übertragung von Bildvorlagen |
US4196451A (en) * | 1976-05-21 | 1980-04-01 | Xerox Corporation | Electronic halftone generator |
US4149183A (en) * | 1976-05-21 | 1979-04-10 | Xerox Corporation | Electronic halftone generator |
JPS56153881A (en) * | 1980-04-30 | 1981-11-28 | Fuji Photo Film Co Ltd | Half tone picture recording device |
JPS5782057A (en) * | 1980-11-11 | 1982-05-22 | Fuji Photo Film Co Ltd | Density adjusting method in recording of picture |
US4661859A (en) * | 1981-06-03 | 1987-04-28 | Xerox Corporation | Pulse width modulation greyscale system for halftone printer |
JPS59163952A (ja) * | 1983-03-08 | 1984-09-17 | Canon Inc | 画像処理装置 |
DE3438949C2 (de) * | 1983-10-25 | 1994-03-10 | Canon Kk | Druckvorrichtung |
US4641200A (en) * | 1984-02-10 | 1987-02-03 | Konishiroku Photo Industry Co., Ltd. | Image reproducing apparatus with variable AC bias |
JP2691205B2 (ja) * | 1985-04-19 | 1997-12-17 | 株式会社リコー | 光走査装置 |
US4800442A (en) * | 1985-08-15 | 1989-01-24 | Canon Kabushiki Kaisha | Apparatus for generating an image from a digital video signal |
JPH067660B2 (ja) * | 1985-08-29 | 1994-01-26 | キヤノン株式会社 | 光ビ−ム走査装置 |
JPH0683358B2 (ja) * | 1985-10-17 | 1994-10-19 | キヤノン株式会社 | 画像情報処理装置の調整方法 |
US4847695A (en) * | 1986-02-06 | 1989-07-11 | Canon Kabushiki Kaisha | Image processing apparatus in which the minimum and maximum widths of a pulse-width modulated signal can be independently adjusted in accordance with predetermined data signals |
US4782398A (en) * | 1986-02-14 | 1988-11-01 | Canon Kabushiki Kaisha | Image processing apparatus |
JPS62247671A (ja) * | 1986-04-18 | 1987-10-28 | Minolta Camera Co Ltd | レ−ザビ−ムプリンタの濃度調整方法 |
JPS63293567A (ja) * | 1987-05-27 | 1988-11-30 | Canon Inc | レーザービームプリンタ |
-
1989
- 1989-07-31 US US07/387,259 patent/US4914455A/en not_active Expired - Lifetime
-
1990
- 1990-06-22 CA CA002019683A patent/CA2019683C/fr not_active Expired - Fee Related
- 1990-07-24 JP JP2196057A patent/JP2763185B2/ja not_active Expired - Fee Related
- 1990-07-27 EP EP90308288A patent/EP0411844B1/fr not_active Expired - Lifetime
- 1990-07-27 DE DE69028822T patent/DE69028822T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2019683C (fr) | 1994-11-01 |
EP0411844B1 (fr) | 1996-10-09 |
DE69028822T2 (de) | 1997-03-20 |
DE69028822D1 (de) | 1996-11-14 |
JPH0370264A (ja) | 1991-03-26 |
EP0411844A3 (en) | 1992-03-04 |
US4914455A (en) | 1990-04-03 |
EP0411844A2 (fr) | 1991-02-06 |
JP2763185B2 (ja) | 1998-06-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |