DE69740128D1 - Unterscheidung zwischen Text/Linien und Halbtonrasterung zur Verbesserung der Bildelementauflösung - Google Patents

Unterscheidung zwischen Text/Linien und Halbtonrasterung zur Verbesserung der Bildelementauflösung

Info

Publication number
DE69740128D1
DE69740128D1 DE69740128T DE69740128T DE69740128D1 DE 69740128 D1 DE69740128 D1 DE 69740128D1 DE 69740128 T DE69740128 T DE 69740128T DE 69740128 T DE69740128 T DE 69740128T DE 69740128 D1 DE69740128 D1 DE 69740128D1
Authority
DE
Germany
Prior art keywords
halftoning
distinction
text
lines
pixel resolution
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
DE69740128T
Other languages
English (en)
Inventor
James G Bearss
Eugene A Roylance
Terry M Nelson
Arlin R Jones
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Application granted granted Critical
Publication of DE69740128D1 publication Critical patent/DE69740128D1/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
    • H04N1/40062—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 Processing (AREA)
  • Record Information Processing For Printing (AREA)
  • Color, Gradation (AREA)
DE69740128T 1997-01-24 1997-09-10 Unterscheidung zwischen Text/Linien und Halbtonrasterung zur Verbesserung der Bildelementauflösung Expired - Lifetime DE69740128D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/788,768 US5987221A (en) 1997-01-24 1997-01-24 Encoded orphan pixels for discriminating halftone data from text and line art data

Publications (1)

Publication Number Publication Date
DE69740128D1 true DE69740128D1 (de) 2011-04-07

Family

ID=25145498

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69740128T Expired - Lifetime DE69740128D1 (de) 1997-01-24 1997-09-10 Unterscheidung zwischen Text/Linien und Halbtonrasterung zur Verbesserung der Bildelementauflösung

Country Status (4)

Country Link
US (1) US5987221A (de)
EP (1) EP0855830B1 (de)
JP (2) JP3822975B2 (de)
DE (1) DE69740128D1 (de)

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DE19635761A1 (de) * 1996-09-03 1998-03-05 Giesecke & Devrient Gmbh Dokument mit moirE-erzeugender Rasterstruktur
JP3755854B2 (ja) * 1997-04-07 2006-03-15 理想科学工業株式会社 画像処理装置および二次元線特徴量算出装置
JP3891654B2 (ja) 1997-08-20 2007-03-14 株式会社東芝 画像形成装置
US6160913A (en) * 1998-03-25 2000-12-12 Eastman Kodak Company Method and apparatus for digital halftone dots detection and removal in business documents
US6173281B1 (en) * 1998-05-22 2001-01-09 International Business Machines Corporation Method and computer program product for processing and combining data sets including bitmaps
US6128408A (en) * 1998-09-23 2000-10-03 Xerox Corporation Method for augmenting sum-of-laplacians in light and dark areas of halftone field to maintain reliable segmentation
US6137907A (en) * 1998-09-23 2000-10-24 Xerox Corporation Method and apparatus for pixel-level override of halftone detection within classification blocks to reduce rectangular artifacts
US6289122B1 (en) * 1999-04-15 2001-09-11 Electronics For Imaging, Inc. Intelligent detection of text on a page
US6628330B1 (en) 1999-09-01 2003-09-30 Neomagic Corp. Color interpolator and horizontal/vertical edge enhancer using two line buffer and alternating even/odd filters for digital camera
US6642962B1 (en) * 1999-09-01 2003-11-04 Neomagic Corp. Merged pipeline for color interpolation and edge enhancement of digital images
JP3392798B2 (ja) * 2000-02-22 2003-03-31 理想科学工業株式会社 画像属性判別方法および装置
US6775410B1 (en) * 2000-05-25 2004-08-10 Xerox Corporation Image processing method for sharpening corners of text and line art
US6785416B1 (en) * 2000-10-17 2004-08-31 Oak Technology, Inc. System and method for the processing of scanned image data using a pixel window
US6778700B2 (en) * 2001-03-14 2004-08-17 Electronics For Imaging, Inc. Method and apparatus for text detection
US7106462B2 (en) * 2001-04-02 2006-09-12 Hewlett-Packard Development Company, L.P. Systems and methods for analyzing a print job
US7167185B1 (en) 2002-03-22 2007-01-23 Kla- Tencor Technologies Corporation Visualization of photomask databases
US7046863B2 (en) * 2002-03-25 2006-05-16 Sharp Laboratories Of America, Inc. Optimizing the advantages of multi-level rendering
US20040205662A1 (en) * 2002-05-30 2004-10-14 Brad Anderson Image preservation and reconstruction
US6914700B2 (en) 2003-04-17 2005-07-05 Lexmark International, Inc. Method for reducing migrating residual error in error diffusion halftoning
US7422310B2 (en) * 2003-04-25 2008-09-09 Hewlett-Packard Development Company, L.P. Methods and apparatus for selecting image enhancement techniques
US7933446B2 (en) * 2004-01-28 2011-04-26 Transpacific Optics Llc Method and apparatus for automatically detecting image and character data
KR100611981B1 (ko) 2004-05-01 2006-08-11 삼성전자주식회사 이미지의 하프토닝 방법 및 장치
JP2006033797A (ja) * 2004-06-17 2006-02-02 Ricoh Co Ltd 画像処理装置及び画像処理方法
US8406523B1 (en) 2005-12-07 2013-03-26 Mcafee, Inc. System, method and computer program product for detecting unwanted data using a rendered format
US8189237B2 (en) 2006-12-19 2012-05-29 Xerox Corporation Distributing a SRE codes in halftone pixels pattern in supercell
US8599439B2 (en) 2007-12-21 2013-12-03 Csr Imaging Us, Lp Laser color copy image processing independent of classifications
US8180152B1 (en) 2008-04-14 2012-05-15 Mcafee, Inc. System, method, and computer program product for determining whether text within an image includes unwanted data, utilizing a matrix
JP4610644B2 (ja) * 2008-08-27 2011-01-12 シャープ株式会社 画像処理装置、画像形成装置、画像処理方法、画像処理プログラム及びコンピュータ読み取り可能な記録媒体
JP4865771B2 (ja) * 2008-08-27 2012-02-01 シャープ株式会社 画像処理装置、画像形成装置、画像処理方法、画像処理プログラム及びコンピュータ読み取り可能な記録媒体
JP4795406B2 (ja) * 2008-08-27 2011-10-19 シャープ株式会社 画像処理装置、画像形成装置、画像処理装置の制御方法、制御プログラム、記録媒体
JP4763026B2 (ja) * 2008-08-27 2011-08-31 シャープ株式会社 画像処理装置、画像形成装置、画像処理方法、画像処理プログラム及びコンピュータ読み取り可能な記録媒体
JP4764938B2 (ja) * 2009-04-07 2011-09-07 シャープ株式会社 画像処理装置、画像形成装置、画像処理装置の制御方法、プログラム、記録媒体
JP6531471B2 (ja) * 2014-07-29 2019-06-19 株式会社リコー 画像形成装置、ディザパターン生成装置およびディザパターン生成方法

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JPS62137974A (ja) * 1985-12-12 1987-06-20 Ricoh Co Ltd 画像処理方式
US4847641A (en) * 1988-08-16 1989-07-11 Hewlett-Packard Company Piece-wise print image enhancement for dot matrix printers
US4975785A (en) * 1989-08-04 1990-12-04 International Business Machines Corporation Pel resolution addressing conversion
DE69126457T2 (de) * 1990-03-02 1997-11-06 Canon Kk Bildverarbeitungsvorrichtung
US5268774A (en) * 1991-11-27 1993-12-07 Xerox Corporation Halftoning with enhanced dynamic range and edge enhanced error diffusion
DE69433603D1 (de) * 1993-10-26 2004-04-15 Canon Kk Bildverarbeitungsverfahren und -gerät
JPH0818785A (ja) * 1994-04-28 1996-01-19 Ricoh Co Ltd 画像出力装置
US5848185A (en) * 1994-12-28 1998-12-08 Canon Kabushiki Kaisha Image processing apparatus and method
JPH096957A (ja) * 1995-06-23 1997-01-10 Toshiba Corp 濃度画像の２値化方法および画像２値化装置
JP3453939B2 (ja) * 1995-08-02 2003-10-06 富士ゼロックス株式会社 画像処理装置
US5742703A (en) * 1995-10-11 1998-04-21 Xerox Corporation Method and apparatus for the resolution enhancement of gray-scale images that include text and line art
DE19646203C2 (de) * 1995-11-10 2001-04-19 Ricoh Kk Bildverarbeitungsapparat zum Bereitstellen einer Funktion zum Entfernen isolierter Punkte
JP3426851B2 (ja) * 1996-04-30 2003-07-14 大日本スクリーン製造株式会社 多色印刷用網点形成方法
EP0845717B1 (de) * 1996-11-29 2002-01-30 Kabushiki Kaisha Toshiba Bildverarbeitungsgerät mit Glättungseigenschaft
JP3472094B2 (ja) * 1997-08-21 2003-12-02 シャープ株式会社 領域判定装置

Also Published As

Publication number Publication date
JP2003264695A (ja) 2003-09-19
JP3822975B2 (ja) 2006-09-20
JPH10224630A (ja) 1998-08-21
EP0855830A3 (de) 2000-02-23
EP0855830A2 (de) 1998-07-29
EP0855830B1 (de) 2011-02-23
US5987221A (en) 1999-11-16

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