DE69029706D1 - Bilderzeugungsgerät zur Halbtonwiedergabe - Google Patents

Bilderzeugungsgerät zur Halbtonwiedergabe

Info

Publication number
DE69029706D1
DE69029706D1 DE69029706T DE69029706T DE69029706D1 DE 69029706 D1 DE69029706 D1 DE 69029706D1 DE 69029706 T DE69029706 T DE 69029706T DE 69029706 T DE69029706 T DE 69029706T DE 69029706 D1 DE69029706 D1 DE 69029706D1
Authority
DE
Germany
Prior art keywords
imaging device
halftone imaging
halftone
imaging
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 - Fee Related
Application number
DE69029706T
Other languages
English (en)
Other versions
DE69029706T2 (de
Inventor
Hiromichi Yamada
Masaharu Ohkubo
Masaki Ojima
Hiroshi Sasame
Takashi Kawana
Kaoru Seto
Hiroshi Mano
Tetsuo Saito
Atsushi Kashihara
Michio Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP1282017A external-priority patent/JPH03144583A/ja
Priority claimed from JP1313387A external-priority patent/JPH03173661A/ja
Priority claimed from JP2003488A external-priority patent/JP2972254B2/ja
Application filed by Canon Inc filed Critical Canon Inc
Application granted granted Critical
Publication of DE69029706D1 publication Critical patent/DE69029706D1/de
Publication of DE69029706T2 publication Critical patent/DE69029706T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04N1/4055—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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color, Gradation (AREA)
  • Facsimile Image Signal Circuits (AREA)
DE69029706T 1989-10-31 1990-10-30 Bilderzeugungsgerät zur Halbtonwiedergabe Expired - Fee Related DE69029706T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1282017A JPH03144583A (ja) 1989-10-31 1989-10-31 記録装置
JP1313387A JPH03173661A (ja) 1989-12-04 1989-12-04 画像形成装置
JP2003488A JP2972254B2 (ja) 1990-01-12 1990-01-12 画像形成装置

Publications (2)

Publication Number Publication Date
DE69029706D1 true DE69029706D1 (de) 1997-02-27
DE69029706T2 DE69029706T2 (de) 1997-06-05

Family

ID=27275857

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69029706T Expired - Fee Related DE69029706T2 (de) 1989-10-31 1990-10-30 Bilderzeugungsgerät zur Halbtonwiedergabe

Country Status (3)

Country Link
US (2) US5463473A (de)
EP (1) EP0426435B1 (de)
DE (1) DE69029706T2 (de)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69228508T2 (de) * 1991-08-01 1999-08-12 Canon Kk Elektrophotographisches Farbgerät
US5436644A (en) * 1991-09-18 1995-07-25 Konica Corporation Image forming method
US5499361A (en) * 1992-03-12 1996-03-12 Mita Industrial Co., Ltd. Density processing method
US5515180A (en) * 1992-11-24 1996-05-07 Sharp Kabushiki Kaisha Image processing device
JP3274200B2 (ja) * 1992-12-28 2002-04-15 キヤノン株式会社 画像形成方法及び装置
US5854882A (en) * 1994-04-08 1998-12-29 The University Of Rochester Halftone correction systems
JPH07304209A (ja) * 1994-05-11 1995-11-21 Tec Corp 電子写真装置
JP3224480B2 (ja) * 1994-09-30 2001-10-29 キヤノン株式会社 カラー画像処理装置
JP3514398B2 (ja) * 1994-12-07 2004-03-31 株式会社リコー 画像形成装置
JPH09172547A (ja) * 1995-10-19 1997-06-30 Ricoh Co Ltd カラー画像形成装置
JPH10301370A (ja) * 1997-04-28 1998-11-13 Nec Niigata Ltd 電子写真装置
US6191867B1 (en) 1997-11-17 2001-02-20 Eastman Kodak Company Method and device for calibrating an imaging apparatus
JP2000168109A (ja) * 1998-12-11 2000-06-20 Olympus Optical Co Ltd 画像補正装置
JP3532472B2 (ja) * 1999-04-27 2004-05-31 シャープ株式会社 画像形成装置
JP3566145B2 (ja) * 1999-09-03 2004-09-15 シャープ株式会社 画像形成装置
JP3604972B2 (ja) 1999-09-17 2004-12-22 キヤノン株式会社 画像処理方法、装置および記録媒体
WO2001073505A1 (fr) * 2000-03-27 2001-10-04 Citizen Watch Co., Ltd. Obturateur à cristaux liquides
JP2002072609A (ja) * 2000-08-31 2002-03-12 Canon Inc 画像形成装置
JP2003098773A (ja) * 2001-07-16 2003-04-04 Hitachi Koki Co Ltd 印写制御方法
JP2003291325A (ja) * 2002-03-29 2003-10-14 Olympus Optical Co Ltd 画像記録装置
US7034858B2 (en) * 2002-10-30 2006-04-25 Kyocera Mita Corporation LED array exposure device, controlling method thereof, and image forming apparatus using the same
US20040114026A1 (en) * 2002-12-12 2004-06-17 Hirohito Kondo Image forming apparatus
JP4095435B2 (ja) * 2002-12-26 2008-06-04 キヤノン株式会社 画像形成装置及びその制御方法、並びに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
JP4301366B2 (ja) * 2003-11-27 2009-07-22 株式会社リコー 画像形成システム
KR100618323B1 (ko) * 2004-11-24 2006-08-31 삼성전자주식회사 다치화 처리장치 및 방법
JP6036614B2 (ja) * 2012-10-25 2016-11-30 富士ゼロックス株式会社 画像形成装置及びプログラム
US9658562B2 (en) 2015-02-19 2017-05-23 Canon Kabushiki Kaisha Image forming apparatus and optical scanning apparatus for scanning photosensitive member with light spot
EP3471271A1 (de) * 2017-10-16 2019-04-17 Acoustical Beauty Verbesserte konvolutionen von digitalen signalen mit verwendung einer bitanforderungsoptimierung eines digitalen zielsignals
US10528297B2 (en) * 2018-03-09 2020-01-07 Fuji Xerox Co., Ltd. Printing instructing apparatus, management server, printing management apparatus, printer, non-transitory computer readable medium, and printing instruction method for transmitting and receiving information related to printing

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308326A (en) * 1979-03-28 1981-12-29 Wirth John L Halftone contact screen and photographic method of making the screen
US4547812A (en) * 1980-06-20 1985-10-15 Information International, Inc. Method and apparatus for forming high resolution halftone images
GB2103449B (en) * 1981-06-29 1985-05-30 Nippon Telegraph & Telephone Method and apparatus for gray level signal processing
JPS58208739A (ja) * 1982-05-31 1983-12-05 Canon Inc 画像形成装置
JPS59205876A (ja) * 1983-05-10 1984-11-21 Canon Inc カラー画像処理装置
US4680646A (en) * 1983-09-05 1987-07-14 Canon Kabushiki Kaisha Image forming device for reproducing a half-tone image
JPS60260072A (ja) * 1984-06-06 1985-12-23 Canon Inc 電子写真の制御方法
US4709250A (en) * 1985-02-19 1987-11-24 Canon Kabushiki Kaisha Image forming apparatus
US4816863A (en) * 1986-11-25 1989-03-28 E. I. Du Pont De Nemours And Company Exposure control system for continuous tone electrophotographic film
JP2607490B2 (ja) * 1986-12-09 1997-05-07 キヤノン株式会社 画像形成装置の画質制御方法
US4989039A (en) * 1987-01-19 1991-01-29 Canon Kabushiki Kaisha Image forming apparatus responsive to environmental conditions
US4873428A (en) * 1987-03-03 1989-10-10 Canon Kabushiki Kaisha Image processing apparatus using conversion means
JPS648488A (en) * 1987-06-30 1989-01-12 Sharp Kk Image signal binarizing device
JP3004991B2 (ja) * 1988-04-18 2000-01-31 キヤノン株式会社 画像処理装置
US4914459A (en) * 1988-04-18 1990-04-03 Ricoh Company, Ltd. Image forming apparatus
JPH0286369A (ja) * 1988-09-22 1990-03-27 Toshiba Corp 画像処理装置
JPH0813552B2 (ja) * 1989-02-17 1996-02-14 松下電器産業株式会社 階調プリンタ
US5313308A (en) * 1989-08-31 1994-05-17 Canon Kabushiki Kaisha Image forming apparatus which changes its tone reproducing property in accordance with ambient conditions
GB2244350B (en) * 1990-04-27 1994-08-10 Ricoh Kk Image forming method and apparatus for the same
JP3021538B2 (ja) * 1990-05-02 2000-03-15 ミノルタ株式会社 デジタル画像形成装置
JP2893861B2 (ja) * 1990-05-15 1999-05-24 ミノルタ株式会社 画像形成装置
JPH04204461A (ja) * 1990-11-29 1992-07-24 Minolta Camera Co Ltd 画像濃度制御装置
US5305057A (en) * 1991-07-05 1994-04-19 Minolta Camera Kabushiki Kaisha Image forming apparatus having correction means for modifying image density signals according to a gradation correction table
JP3116485B2 (ja) * 1991-12-16 2000-12-11 ミノルタ株式会社 デジタル画像形成装置

Also Published As

Publication number Publication date
US5565995A (en) 1996-10-15
EP0426435B1 (de) 1997-01-15
DE69029706T2 (de) 1997-06-05
US5463473A (en) 1995-10-31
EP0426435A2 (de) 1991-05-08
EP0426435A3 (en) 1992-10-28

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee