TW200509680A - Digital de-screening technique for scanned documents - Google Patents

Digital de-screening technique for scanned documents

Info

Publication number
TW200509680A
TW200509680A TW093100007A TW93100007A TW200509680A TW 200509680 A TW200509680 A TW 200509680A TW 093100007 A TW093100007 A TW 093100007A TW 93100007 A TW93100007 A TW 93100007A TW 200509680 A TW200509680 A TW 200509680A
Authority
TW
Taiwan
Prior art keywords
pair
digital
image signal
filters
screening technique
Prior art date
Application number
TW093100007A
Other languages
English (en)
Other versions
TWI328392B (en
Inventor
Donald J Curry
Doron Kletter
Asghar Nafarieh
Original Assignee
Xerox 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
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of TW200509680A publication Critical patent/TW200509680A/zh
Application granted granted Critical
Publication of TWI328392B publication Critical patent/TWI328392B/zh

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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/73—Deblurring; Sharpening
    • G06T5/75—Unsharp masking
    • 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
    • H04N1/409—Edge or detail enhancement; Noise or error suppression
    • H04N1/4092—Edge or detail enhancement

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Facsimiles In General (AREA)
  • Color, Gradation (AREA)
TW093100007A 2003-07-01 2004-01-02 Digital de-screening technique for scanned documents TWI328392B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/612,064 US7433084B2 (en) 2002-07-01 2003-07-01 Digital de-screening technique for scanned documents

Publications (2)

Publication Number Publication Date
TW200509680A true TW200509680A (en) 2005-03-01
TWI328392B TWI328392B (en) 2010-08-01

Family

ID=33435448

Family Applications (1)

Application Number Title Priority Date Filing Date
TW093100007A TWI328392B (en) 2003-07-01 2004-01-02 Digital de-screening technique for scanned documents

Country Status (4)

Country Link
US (1) US7433084B2 (zh)
EP (1) EP1494452A3 (zh)
JP (2) JP2005204266A (zh)
TW (1) TWI328392B (zh)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7433084B2 (en) 2002-07-01 2008-10-07 Xerox Corporation Digital de-screening technique for scanned documents
US7847805B2 (en) * 2003-10-30 2010-12-07 Panasonic Corporation Display apparatus, display method, program and recording medium
US7365882B2 (en) * 2004-02-12 2008-04-29 Xerox Corporation Halftone screen frequency and magnitude estimation for digital descreening of documents
US20060001597A1 (en) * 2004-06-30 2006-01-05 Sokbom Han Image processing apparatus, systems and associated methods
US7542164B2 (en) * 2004-07-14 2009-06-02 Xerox Corporation Common exchange format architecture for color printing in a multi-function system
US20070146794A1 (en) * 2005-12-23 2007-06-28 Lexmark International, Inc. Descreening and detail enhancement for scanned documents
JP4943721B2 (ja) * 2006-03-20 2012-05-30 株式会社リコー 画像データのカラーノイズ除去方法及びこの方法を用いた撮像装置
US8442344B2 (en) * 2006-08-07 2013-05-14 Qualcomm Incorporated Adaptive spatial image filter for filtering image information
KR101225434B1 (ko) 2006-11-01 2013-01-22 엘지디스플레이 주식회사 액정표시장치 및 그의 구동 방법
US8798385B2 (en) * 2009-02-16 2014-08-05 Raytheon Company Suppressing interference in imaging systems
US8665498B2 (en) 2010-07-20 2014-03-04 Conexant Systems, Inc. Method and system for automatically detecting and processing halftone regions in scanned documents
US8983218B2 (en) * 2012-04-11 2015-03-17 Texas Instruments Incorporated Virtual boundary processing simplification for adaptive loop filtering (ALF) in video coding
CN107358582B (zh) * 2017-06-19 2020-06-26 西安理工大学 自适应选择高斯滤波参数的印刷图像去网方法

Family Cites Families (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998029832A1 (fr) * 1996-12-25 1998-07-09 Sony Corporation Processeur d'images, processeur de donnees et procedes correspondants
US4849914A (en) 1987-09-22 1989-07-18 Opti-Copy, Inc. Method and apparatus for registering color separation film
JP3200873B2 (ja) * 1990-11-30 2001-08-20 ミノルタ株式会社 画像処理装置
JP2624009B2 (ja) * 1991-03-25 1997-06-25 富士ゼロックス株式会社 ファクシミリ装置
IL98004A (en) * 1991-04-30 1997-02-18 Scitex Corp Ltd Apparatus and method for descreening
US5351314A (en) * 1991-10-04 1994-09-27 Canon Information Systems, Inc. Method and apparatus for image enhancement using intensity dependent spread filtering
JP3097785B2 (ja) * 1992-04-30 2000-10-10 株式会社リコー 画像処理装置
US5343309A (en) * 1992-08-12 1994-08-30 Xerox Corporation Image processing system and method employing adaptive filtering to provide improved reconstruction of continuous tone images from halftone images including those without a screen structure
JPH06152933A (ja) * 1992-11-12 1994-05-31 Fuji Xerox Co Ltd 網かけおよび塗り潰し編集処理装置
US5515452A (en) 1992-12-31 1996-05-07 Electroglas, Inc. Optical character recognition illumination method and system
JP3650766B2 (ja) * 1993-10-08 2005-05-25 松下電器産業株式会社 階調変換処理装置
US5638134A (en) * 1994-06-29 1997-06-10 Sony Corporation Digital filter for picture data and digital filter system
US5583659A (en) 1994-11-10 1996-12-10 Eastman Kodak Company Multi-windowing technique for thresholding an image using local image properties
US5745596A (en) 1995-05-01 1998-04-28 Xerox Corporation Method and apparatus for performing text/image segmentation
US5835630A (en) 1996-05-08 1998-11-10 Xerox Corporation Modular time-varying two-dimensional filter
JPH1084475A (ja) * 1996-09-09 1998-03-31 Sharp Corp 画像領域判別方法および画像処理装置
EP0868815A2 (en) * 1996-10-24 1998-10-07 Koninklijke Philips Electronics N.V. Noise filtering
JP3480547B2 (ja) * 1997-06-05 2003-12-22 大日本スクリーン製造株式会社 画像修正方法及びその装置並びにプログラムを記録した記憶媒体
US5900953A (en) 1997-06-17 1999-05-04 At&T Corp Method and apparatus for extracting a foreground image and a background image from a color document image
JP3736593B2 (ja) * 1997-06-25 2006-01-18 富士ゼロックス株式会社 画像処理装置および画像平滑化方法
EP0926626A1 (fr) * 1997-12-23 1999-06-30 Koninklijke Philips Electronics N.V. Procédé de traitement d'image pour réduire le bruit dans une image d'une séquence de trois images temporelles et appareil d'imagerie médicale mettant en oeuvre un tel procédé
FR2772956A1 (fr) * 1997-12-23 1999-06-25 Philips Electronics Nv Procede de traitement d'image incluant des etapes de filtrage spatiotemporel du bruit et appareil d'imagerie medicale mettant en oeuvre ce procede
US6058214A (en) 1998-01-20 2000-05-02 At&T Corp. Compression of partially masked still images
US6222945B1 (en) * 1998-01-30 2001-04-24 Compaq Computer Corporation Selective filtering of a dithered image for the purpose of inverse dithering
US6324305B1 (en) 1998-12-22 2001-11-27 Xerox Corporation Method and apparatus for segmenting a composite image into mixed raster content planes
US6400844B1 (en) 1998-12-02 2002-06-04 Xerox Corporation Method and apparatus for segmenting data to create mixed raster content planes
JP2000341549A (ja) * 1999-05-31 2000-12-08 Ricoh Co Ltd カラー画像処理装置
JP2001319228A (ja) * 2000-02-28 2001-11-16 Sharp Corp 画像処理装置および画像処理システム
US6633670B1 (en) 2000-03-31 2003-10-14 Sharp Laboratories Of America, Inc. Mask generation for multi-layer image decomposition
JP2002074356A (ja) * 2000-08-28 2002-03-15 Fuji Photo Film Co Ltd 画像処理方法および装置並びに記録媒体
US6404934B1 (en) * 2000-10-20 2002-06-11 Shih-Jong J. Lee High speed image processing apparatus using a cascade of elongated filters programmed in a computer
US6839152B2 (en) * 2000-12-06 2005-01-04 Xerox Corporation Adaptive filtering method and apparatus for descreening scanned halftoned image representations
US6947178B2 (en) * 2001-02-26 2005-09-20 International Business Machines Corporation De-screening halftones using sigma filters
US6725247B2 (en) * 2001-04-30 2004-04-20 Intel Corporation Two-dimensional pyramid filter architecture
JP2002344743A (ja) * 2001-05-11 2002-11-29 Ricoh Co Ltd 画像処理装置および画像処理方法
US7106478B2 (en) * 2002-01-25 2006-09-12 Kabushiki Kaisha Toshiba Image processing device and method for controlling the same
US7433084B2 (en) 2002-07-01 2008-10-07 Xerox Corporation Digital de-screening technique for scanned documents
US7365881B2 (en) * 2002-08-19 2008-04-29 Eastman Kodak Company Halftone dot-growth technique based on morphological filtering

Also Published As

Publication number Publication date
JP2009284550A (ja) 2009-12-03
US20040051908A1 (en) 2004-03-18
US7433084B2 (en) 2008-10-07
TWI328392B (en) 2010-08-01
JP2005204266A (ja) 2005-07-28
EP1494452A3 (en) 2007-09-05
EP1494452A2 (en) 2005-01-05

Similar Documents

Publication Publication Date Title
EP1379074A3 (en) Digital descreening of image signals
TW200509680A (en) Digital de-screening technique for scanned documents
EP0808046A3 (en) Digital signal processing apparatus and method
TW200601813A (en) Apparatus and methods for de-screening scanned documents
DE50111554D1 (de) Verfahren und vorrichtung zur filterung eines signals
WO2004031916A3 (en) Method and apparatus for characterizing documents based on clusters of related words
WO2007027839A3 (en) Device and methods for enhanced matched filtering based on correntropy
TW200733730A (en) Gamma curve adjustment device and method of establishing adjustment points
WO2006014845A3 (en) Ontology based method for data capture and knowledge representation
GB0408856D0 (en) Signal encoding
WO2006116651A3 (en) Method, system and apparatus for an output generator for use in the processing of structured documents
IL174961A0 (en) All-optical signal processing method and device
EP1259081A3 (en) Encoding continuous image data
WO2000070863A3 (en) Image reconstruction architecture
WO2004070556A3 (en) Method and system for integrating data flows
CA2210244A1 (en) Inter-separation color image processing using error diffusion
WO2007110750A3 (en) Low complexity subband-domain filtering in the case of cascaded filter banks
EP1152597A3 (en) Calibration for an image output device
TW200627808A (en) Digital signal processor, receiver, corrector and methods for the same
EP1215883A3 (en) Adaptive filtering method and apparatus for descreening scanned halftoned image representations
EP1566964A4 (en) IMAGE PLAYER AND IMAGE PROCESSING
EP1286304A3 (en) System and method for extracting a watermark signal in a digital image sequence
CN101098152A (zh) 噪声消除器及使用其的接收装置
HK1073174A1 (en) Method and system for generating an image having multiple hues using an image intensifier
EP0935204A3 (en) Programmable correlator coprocessor

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees