JPH042035B2 - - Google Patents

Info

Publication number
JPH042035B2
JPH042035B2 JP57152491A JP15249182A JPH042035B2 JP H042035 B2 JPH042035 B2 JP H042035B2 JP 57152491 A JP57152491 A JP 57152491A JP 15249182 A JP15249182 A JP 15249182A JP H042035 B2 JPH042035 B2 JP H042035B2
Authority
JP
Japan
Prior art keywords
image
line
scanning
halftone
speed
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
JP57152491A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5875374A (ja
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 filed Critical
Publication of JPS5875374A publication Critical patent/JPS5875374A/ja
Publication of JPH042035B2 publication Critical patent/JPH042035B2/ja
Granted 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
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
    • 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/17—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa the scanning speed being dependent on content of picture
    • 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)
  • Facsimile Scanning Arrangements (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Image Input (AREA)
JP57152491A 1981-09-10 1982-09-01 画像走査装置 Granted JPS5875374A (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US300845 1981-09-10
US06/300,845 US4447830A (en) 1981-09-10 1981-09-10 Image scanning apparatus and method

Publications (2)

Publication Number Publication Date
JPS5875374A JPS5875374A (ja) 1983-05-07
JPH042035B2 true JPH042035B2 (index.php) 1992-01-16

Family

ID=23160828

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57152491A Granted JPS5875374A (ja) 1981-09-10 1982-09-01 画像走査装置

Country Status (4)

Country Link
US (1) US4447830A (index.php)
EP (1) EP0074795A3 (index.php)
JP (1) JPS5875374A (index.php)
CA (1) CA1189374A (index.php)

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US4554593A (en) * 1981-01-02 1985-11-19 International Business Machines Corporation Universal thresholder/discriminator
GB2103449B (en) * 1981-06-29 1985-05-30 Nippon Telegraph & Telephone Method and apparatus for gray level signal processing
GB2115256B (en) * 1981-12-19 1986-01-29 Konishiroku Photo Ind Picture image discriminating apparatus
JPS58155481A (ja) * 1982-03-10 1983-09-16 Ricoh Co Ltd 画像２値化処理方式
JPH0683365B2 (ja) * 1983-05-25 1994-10-19 キヤノン株式会社 画像処理装置
JPS59223073A (ja) * 1983-06-01 1984-12-14 Canon Inc 画像処理装置
JPS6043970A (ja) * 1983-08-22 1985-03-08 Kyodo Printing Co Ltd 網点信号処理装置
JPS6052163A (ja) * 1983-09-01 1985-03-25 Canon Inc 画像処理装置
US4701807A (en) * 1983-09-22 1987-10-20 Canon Kabushiki Kaisha Method and apparatus for processing an image
US4598323A (en) * 1983-10-26 1986-07-01 Canon Kabushiki Kaisha Image processing apparatus
EP0163898A3 (de) * 1984-04-27 1986-03-05 Siemens Aktiengesellschaft Verfahren zur Codierung von Faksimiles
US4723173A (en) * 1984-05-31 1988-02-02 Canon Kabushiki Kaisha Image processing apparatus
US4651287A (en) * 1984-06-14 1987-03-17 Tsao Sherman H Digital image processing algorithm for output devices with discrete halftone gray scale capability
US4741046A (en) * 1984-07-27 1988-04-26 Konishiroku Photo Industry Co., Ltd. Method of discriminating pictures
JPS6180969A (ja) * 1984-09-28 1986-04-24 Fuji Xerox Co Ltd 画信号処理装置
JPS6182577A (ja) * 1984-09-29 1986-04-26 Toshiba Corp 画像記録装置
JPS61105973A (ja) * 1984-10-30 1986-05-24 Fuji Xerox Co Ltd 画信号処理方法
US4707745A (en) * 1984-12-20 1987-11-17 Ricoh Company, Ltd. Digital copier with document image region decision device
JPH065878B2 (ja) * 1984-12-28 1994-01-19 キヤノン株式会社 画像処理装置
JPS61157158A (ja) * 1984-12-28 1986-07-16 Canon Inc 画像処理装置
US4821334A (en) * 1984-12-28 1989-04-11 Canon Kabushiki Kaisha Image processing apparatus
US4941185A (en) * 1985-03-18 1990-07-10 Crosfield Electronics Image processing
GB8506931D0 (en) * 1985-03-18 1985-04-24 Crosfield Electronics Ltd Image processing
DE3687023T2 (de) * 1985-08-29 1993-04-15 Canon Kk Bildverarbeitungsvorrichtung.
US4870499A (en) * 1985-08-29 1989-09-26 Canon Kabushiki Kaisha Image processing apparatus
JPS6288478A (ja) * 1985-10-14 1987-04-22 Oki Electric Ind Co Ltd 画像処理方法
DE3637058A1 (de) * 1985-10-31 1987-05-07 Ricoh Kk Digitales kopiergeraet
US5177795A (en) * 1985-11-05 1993-01-05 Canon Kabushiki Kaisha Image processing apparatus
CA1268547A (en) * 1986-03-31 1990-05-01 Ahmed Mostafa El-Sherbini Thresholding algorithm selection apparatus
JPH0626439B2 (ja) * 1986-04-18 1994-04-06 株式会社日立製作所 高画質化装置
US5175635A (en) * 1986-06-02 1992-12-29 Kabushiki Kaisha Toshiba Picture printing apparatus using multivalued patterns, binary patterns and dither patterns selectively
JPH0789645B2 (ja) * 1986-09-11 1995-09-27 沖電気工業株式会社 画像処理方式
JPH088638B2 (ja) * 1986-09-11 1996-01-29 沖電気工業株式会社 画像処理方式
US5121230A (en) * 1987-01-19 1992-06-09 Canon Kabushiki Kaisha Image reading apparatus having adjusting circuits for matching the level of and compensating for fluctuation among a plurality of sensing elements
GB8718100D0 (en) * 1987-07-30 1987-09-03 Crosfield Electronics Ltd Image processing
US4856075A (en) * 1987-10-05 1989-08-08 Eastman Kodak Company Image discrimination
JPH01198870A (ja) * 1987-10-08 1989-08-10 Ricoh Co Ltd デジタルカラー画像処理装置
US4862283A (en) * 1987-11-02 1989-08-29 Eastman Kodak Company Image discrimination with continuous tone area thinning
US5001767A (en) * 1987-11-30 1991-03-19 Kabushiki Kaisha Toshiba Image processing device
US5014124A (en) * 1988-02-25 1991-05-07 Ricoh Company, Ltd. Digital image processing apparatus
US4942480A (en) * 1988-09-06 1990-07-17 Nynex Corporation Reproduction of halftone original with moire reduction and tone adjustment
JPH0286369A (ja) * 1988-09-22 1990-03-27 Toshiba Corp 画像処理装置
US5001576A (en) * 1988-09-28 1991-03-19 Konica Corporation Image processor with improved discrimination between character image and tonal image
JP2902655B2 (ja) * 1988-11-18 1999-06-07 株式会社東芝 画像読取装置及び画像読取方法
US5153925A (en) * 1989-04-27 1992-10-06 Canon Kabushiki Kaisha Image processing apparatus
US5212569A (en) * 1989-06-29 1993-05-18 Fuji Photo Film Co., Ltd. Light beam scanning apparatus capable of changing the scanning density
DE69026159T2 (de) * 1989-08-02 1996-10-17 Canon Kk Bildverarbeitungsgerät
US5101438A (en) * 1990-02-02 1992-03-31 Ricoh Company, Ltd. Method of discriminating different kinds of image areas, involving two-dimensional orthogonal transforms
JPH03290774A (ja) * 1990-04-06 1991-12-20 Fuji Facom Corp 文書画像の文章領域抽出装置
US5057942A (en) * 1990-04-09 1991-10-15 Xerox Corporation Electronic document scanner with a transparent imaging and drive roller
JPH05504038A (ja) * 1990-11-19 1993-06-24 イーストマン コダック カンパニー スキャニング速度補償
US5566255A (en) * 1991-03-05 1996-10-15 Ricoh Company, Ltd. Segmenting a page of a document into areas which are text and areas which are halftone
IL98004A (en) * 1991-04-30 1997-02-18 Scitex Corp Ltd Apparatus and method for descreening
US5280367A (en) * 1991-05-28 1994-01-18 Hewlett-Packard Company Automatic separation of text from background in scanned images of complex documents
US5317419A (en) * 1991-08-07 1994-05-31 Konica Corporation Image recognition apparatus
US5649031A (en) * 1992-03-31 1997-07-15 Hitachi, Ltd. Image information processor for producing high-quality output image
EP0576226B1 (en) * 1992-06-22 1998-12-02 Fujitsu Limited Method and apparatus for reading image of image scanner-reader
JPH06189096A (ja) * 1992-12-22 1994-07-08 Murata Mach Ltd ファクシミリ装置
US5341226A (en) * 1993-04-22 1994-08-23 Xerox Corporation Automatic image segmentation for color documents
US5517231A (en) * 1993-09-30 1996-05-14 Eastman Kodak Company Apparatus and method for increasing the productivity of a thermal printing apparatus for the production of finely detailed images of photographic quality
US5485289A (en) * 1993-10-28 1996-01-16 Xerox Corporation Hyperacuity printer architecture
CA2128858A1 (en) 1993-10-28 1995-04-29 Douglas N. Curry Two dimensional linear interpolation with slope output for a hyperacuity printer
DE4447705C2 (de) * 1993-10-30 2000-04-13 Ricoh Kk Bilderzeugungseinrichtung, die ein Spezialdokument identifizieren kann
US5659402A (en) * 1994-01-14 1997-08-19 Mita Industrial Co., Ltd. Image processing method and apparatus
JPH07236034A (ja) * 1994-02-22 1995-09-05 Matsushita Electric Ind Co Ltd 画像読み取り装置
JPH09186890A (ja) * 1995-12-20 1997-07-15 Xerox Corp デジタル式ハイライトカラーコピー形成方法
JPH10164327A (ja) * 1996-11-29 1998-06-19 Olympus Optical Co Ltd 画像入力装置
US6252676B1 (en) * 1997-06-04 2001-06-26 Agfa Corporation System and method for proofing
DE19754488A1 (de) * 1997-12-09 1999-06-10 Thomas Dr Wagner Vorrichtung und Verfahren zum inhaltsabhängigen Scannen
US6181829B1 (en) * 1998-01-21 2001-01-30 Xerox Corporation Method and system for classifying and processing of pixels of image data
US6178015B1 (en) * 1998-06-05 2001-01-23 Mustek Systems, Inc. Apparatus and method for increasing the scan accuracy and quality of the flatbed scanner by using close loop control
GB2349766B (en) 1999-02-11 2003-07-16 Fujifilm Electronic Imaging Scanning method
US6738524B2 (en) 2000-12-15 2004-05-18 Xerox Corporation Halftone detection in the wavelet domain
US7130091B2 (en) * 2001-07-05 2006-10-31 Nisca Corporation Image reading apparatus and image reading method
WO2003061271A1 (en) * 2002-01-09 2003-07-24 Sony Corporation Image reading device and method
US7639392B2 (en) * 2003-03-28 2009-12-29 Infoprint Solutions Company, Llc Methods, systems, and media to enhance image processing in a color reprographic system
US7840071B2 (en) * 2006-12-12 2010-11-23 Seiko Epson Corporation Method and apparatus for identifying regions of different content in an image

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US3646255A (en) * 1970-02-20 1972-02-29 Newton Electronic Systems Inc Facsimile system
US3723640A (en) * 1970-06-19 1973-03-27 Xerox Corp Method and apparatus for rapidly scanning a document
US3912861A (en) * 1974-01-30 1975-10-14 Exxon Research Engineering Co Method and apparatus for time compression of facsimile transmissions
JPS5275234A (en) * 1975-12-19 1977-06-24 Toshiba Corp Pattern pick up unit
JPS5295113A (en) * 1976-02-05 1977-08-10 Fujitsu Ltd Band compression transmission system
US4065788A (en) * 1976-02-09 1977-12-27 Mcdonnell Douglas Corporation Realtime image processor
JPS5313822A (en) * 1976-07-23 1978-02-07 Sharp Corp Video information reader
US4084188A (en) * 1976-11-15 1978-04-11 Rca Corporation Optical scanner
US4205350A (en) * 1977-03-10 1980-05-27 Xerox Corporation Reproduction scanning system having intermediate storage between input and output scanning stations
US4149090A (en) * 1977-05-02 1979-04-10 Xerox Corporation Crossover arrangement for multiple scanning arrays
US4150873A (en) * 1977-07-29 1979-04-24 Eastman Kodak Company Bi-directional optical scanning
US4173772A (en) * 1977-12-30 1979-11-06 International Business Machines Corporation Solid state image scanning system for producing a binary output
US4194221A (en) * 1978-12-26 1980-03-18 Xerox Corporation Automatic multimode continuous halftone line copy reproduction
US4506301A (en) * 1979-10-12 1985-03-19 Xerox Corporation Multiple mode raster scanner
US4288821A (en) * 1980-06-02 1981-09-08 Xerox Corporation Multi-resolution image signal processing apparatus and method

Also Published As

Publication number Publication date
EP0074795A2 (en) 1983-03-23
JPS5875374A (ja) 1983-05-07
EP0074795A3 (en) 1986-03-26
US4447830A (en) 1984-05-08
CA1189374A (en) 1985-06-25

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