CA1189374A - Image scanning apparatus and method - Google Patents

Image scanning apparatus and method

Info

Publication number
CA1189374A
CA1189374A CA000410976A CA410976A CA1189374A CA 1189374 A CA1189374 A CA 1189374A CA 000410976 A CA000410976 A CA 000410976A CA 410976 A CA410976 A CA 410976A CA 1189374 A CA1189374 A CA 1189374A
Authority
CA
Canada
Prior art keywords
image
scanning
speed
halftone
images
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
Application number
CA000410976A
Other languages
English (en)
French (fr)
Inventor
James C. Stoffel
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.)
Xerox Corp
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
Application granted granted Critical
Publication of CA1189374A publication Critical patent/CA1189374A/en
Expired 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)
CA000410976A 1981-09-10 1982-09-08 Image scanning apparatus and method Expired CA1189374A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US300,845 1981-09-10
US06/300,845 US4447830A (en) 1981-09-10 1981-09-10 Image scanning apparatus and method

Publications (1)

Publication Number Publication Date
CA1189374A true CA1189374A (en) 1985-06-25

Family

ID=23160828

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000410976A Expired CA1189374A (en) 1981-09-10 1982-09-08 Image scanning apparatus and method

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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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
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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
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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
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DE4447705C2 (de) * 1993-10-30 2000-04-13 Ricoh Kk Bilderzeugungseinrichtung, die ein Spezialdokument identifizieren kann
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US6252676B1 (en) * 1997-06-04 2001-06-26 Agfa Corporation System and method for proofing
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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
JPH042035B2 (index.php) 1992-01-16

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Legal Events

Date Code Title Description
MKEC Expiry (correction)
MKEX Expiry