DE3686821D1 - Halbtonbildverarbeitungseinrichtung. - Google Patents

Halbtonbildverarbeitungseinrichtung.

Info

Publication number
DE3686821D1
DE3686821D1 DE8686400020T DE3686821T DE3686821D1 DE 3686821 D1 DE3686821 D1 DE 3686821D1 DE 8686400020 T DE8686400020 T DE 8686400020T DE 3686821 T DE3686821 T DE 3686821T DE 3686821 D1 DE3686821 D1 DE 3686821D1
Authority
DE
Germany
Prior art keywords
image processing
processing device
halftone image
halftone
processing
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
Application number
DE8686400020T
Other languages
English (en)
Other versions
DE3686821T2 (de
Inventor
Hisashi Ibaraki
Makoto Kobayashi
Hiroshi Ochi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 JP60002453A external-priority patent/JPS61161870A/ja
Priority claimed from JP60033696A external-priority patent/JPH0666884B2/ja
Priority claimed from JP60079874A external-priority patent/JPS61238176A/ja
Priority claimed from JP60287696A external-priority patent/JPS62147860A/ja
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Application granted granted Critical
Publication of DE3686821D1 publication Critical patent/DE3686821D1/de
Publication of DE3686821T2 publication Critical patent/DE3686821T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N1/40075—Descreening, i.e. converting a halftone signal into a corresponding continuous-tone signal; Rescreening, i.e. combined descreening and halftoning
    • 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
    • H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Analysis (AREA)
DE8686400020T 1985-01-10 1986-01-07 Halbtonbildverarbeitungseinrichtung. Expired - Lifetime DE3686821T2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP60002453A JPS61161870A (ja) 1985-01-10 1985-01-10 網点写真領域識別方式
JP60033696A JPH0666884B2 (ja) 1985-02-23 1985-02-23 網点写真領域識別方法
JP60079874A JPS61238176A (ja) 1985-04-15 1985-04-15 中間調ファクシミリ信号処理方法
JP60287696A JPS62147860A (ja) 1985-12-23 1985-12-23 中間調フアクシミリ信号処理方式

Publications (2)

Publication Number Publication Date
DE3686821D1 true DE3686821D1 (de) 1992-11-05
DE3686821T2 DE3686821T2 (de) 1993-04-01

Family

ID=27453636

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686400020T Expired - Lifetime DE3686821T2 (de) 1985-01-10 1986-01-07 Halbtonbildverarbeitungseinrichtung.

Country Status (3)

Country Link
US (1) US4722008A (de)
EP (1) EP0187724B1 (de)
DE (1) DE3686821T2 (de)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853792A (en) * 1987-02-04 1989-08-01 Sharp Kabushiki Kaisha Image signal binary encoder
JP2702928B2 (ja) * 1987-06-19 1998-01-26 株式会社日立製作所 画像入力装置
JP2615625B2 (ja) * 1987-06-24 1997-06-04 富士ゼロックス株式会社 画像処理装置
JPH01295570A (ja) * 1988-05-23 1989-11-29 Mitsubishi Electric Corp 画像処理装置
US5131053A (en) * 1988-08-10 1992-07-14 Caere Corporation Optical character recognition method and apparatus
US4920501A (en) * 1988-10-19 1990-04-24 Eastman Kodak Company Digital halftoning with minimum visual modulation patterns
US5113267A (en) * 1989-11-09 1992-05-12 Lee Aldric K Apparatus for and method of reconstructing a document
US5131049A (en) * 1989-12-08 1992-07-14 Xerox Corporation Identification, characterization, and segmentation of halftone or stippled regions of binary images by growing a seed to a clipping mask
JPH07106646B2 (ja) * 1989-12-25 1995-11-15 富士ゼロックス株式会社 画像処理装置
US5214517A (en) * 1990-02-07 1993-05-25 Eastman Kodak Company Digital halftoning with correlated minimum visual modulation patterns
US5193122A (en) * 1990-12-03 1993-03-09 Xerox Corporation High speed halftone detection technique
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
EP0566581B1 (de) * 1991-01-10 1997-01-29 Wang Laboratories, Inc. Verfahren zur transformierung eines ditherbildes
US5339170A (en) * 1991-12-31 1994-08-16 Xerox Corporation Image processing system and method employing hybrid filtering to provide improved reconstruction of continuous tone images from halftone screen-structured images
JP3200931B2 (ja) * 1992-03-23 2001-08-20 ミノルタ株式会社 網点画像の領域判別回路
US5243444A (en) * 1992-03-25 1993-09-07 Xerox Corporation Image processing system and method with improved reconstruction of continuous tone images from halftone images including those without a screen structure
US5515180A (en) * 1992-11-24 1996-05-07 Sharp Kabushiki Kaisha Image processing device
US5483355A (en) * 1994-03-11 1996-01-09 Hewlett-Packard Co. Pixel correctional and smoothing method
JP3207690B2 (ja) * 1994-10-27 2001-09-10 シャープ株式会社 画像処理装置
US5649026A (en) * 1994-11-21 1997-07-15 Opex Corporation Apparatus for detecting marks on documents
KR0181032B1 (ko) * 1995-03-20 1999-05-01 배순훈 인터리빙을 이용한 물체 기반 부호화방법 및 장치
JP3436828B2 (ja) * 1995-05-08 2003-08-18 株式会社リコー 画像処理装置
JP3540128B2 (ja) * 1997-07-11 2004-07-07 シャープ株式会社 画像処理回路
JP3512604B2 (ja) * 1997-09-11 2004-03-31 シャープ株式会社 画像処理装置、および、そのプログラムを記録した記録媒体
US6707572B1 (en) * 1997-09-12 2004-03-16 Tesseron, Ltd. Filtering method to reduce pixel density
US6160913A (en) * 1998-03-25 2000-12-12 Eastman Kodak Company Method and apparatus for digital halftone dots detection and removal in business documents
US6185335B1 (en) 1998-07-07 2001-02-06 Electronics For Imaging, Inc. Method and apparatus for image classification and halftone detection
JP3678941B2 (ja) 1999-05-28 2005-08-03 シャープ株式会社 画像処理装置及びそれを備えた画像形成装置
WO2001050236A1 (en) * 2000-01-03 2001-07-12 Array Ab Publ. Printing device and method
CN1184796C (zh) * 2001-07-26 2005-01-12 佳能株式会社 图象处理方法和设备以及图象处理系统
JP2003348342A (ja) * 2002-02-28 2003-12-05 Ricoh Co Ltd 画像処理装置及び画像形成装置
JP4169522B2 (ja) * 2002-03-22 2008-10-22 株式会社リコー 画像処理装置、画像処理プログラム及びこのプログラムを記憶する記憶媒体
JP4053345B2 (ja) * 2002-04-25 2008-02-27 シャープ株式会社 画像処理方法および画像処理装置、それを備える画像形成装置ならびにプログラムおよび記録媒体
US20050281463A1 (en) * 2004-04-22 2005-12-22 Samsung Electronics Co., Ltd. Method and apparatus for processing binary image
JP4555212B2 (ja) * 2005-11-10 2010-09-29 株式会社沖データ 透かし情報埋め込み装置，透かし情報埋め込み方法，およびコンピュータプログラム
US7702154B2 (en) * 2006-01-13 2010-04-20 Adobe Systems, Incorporated Method and apparatus indentifying halftone regions within a digital image
US7750330B2 (en) * 2007-01-11 2010-07-06 Canon Kabushiki Kaisha Device and method for identifying recording medium and image forming apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254438A (en) * 1978-12-13 1981-03-03 Kokusai Denshin Denwa Kabushiki Kaisha Coding method for facsimile signal
US4554593A (en) * 1981-01-02 1985-11-19 International Business Machines Corporation Universal thresholder/discriminator
US4577235A (en) * 1984-08-20 1986-03-18 The Mead Corporation Text/continuous tone image decision processor

Also Published As

Publication number Publication date
EP0187724A3 (en) 1989-05-31
DE3686821T2 (de) 1993-04-01
US4722008A (en) 1988-01-26
EP0187724A2 (de) 1986-07-16
EP0187724B1 (de) 1992-09-30

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Legal Events

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8364 No opposition during term of opposition