CA2445742C - Selective enhancement of black - Google Patents

Selective enhancement of black Download PDF

Info

Publication number
CA2445742C
CA2445742C CA002445742A CA2445742A CA2445742C CA 2445742 C CA2445742 C CA 2445742C CA 002445742 A CA002445742 A CA 002445742A CA 2445742 A CA2445742 A CA 2445742A CA 2445742 C CA2445742 C CA 2445742C
Authority
CA
Canada
Prior art keywords
black color
reference pattern
black
pixel
pixels
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 - Fee Related
Application number
CA002445742A
Other languages
English (en)
French (fr)
Other versions
CA2445742A1 (en
Inventor
Stephen M. Kroon
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
Publication of CA2445742A1 publication Critical patent/CA2445742A1/en
Application granted granted Critical
Publication of CA2445742C publication Critical patent/CA2445742C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/011—Details of unit for exposing
    • G03G15/0115—Details of unit for exposing and forming a half-tone image
    • 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
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00063—Colour
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
    • G03G2215/0158—Colour registration

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Color, Gradation (AREA)
  • Color Electrophotography (AREA)
  • Laser Beam Printer (AREA)
CA002445742A 2002-10-25 2003-10-21 Selective enhancement of black Expired - Fee Related CA2445742C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/280,214 2002-10-25
US10/280,214 US6742870B2 (en) 2002-10-25 2002-10-25 Selective enhancement of black

Publications (2)

Publication Number Publication Date
CA2445742A1 CA2445742A1 (en) 2004-04-25
CA2445742C true CA2445742C (en) 2007-12-04

Family

ID=32106873

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002445742A Expired - Fee Related CA2445742C (en) 2002-10-25 2003-10-21 Selective enhancement of black

Country Status (5)

Country Link
US (1) US6742870B2 (enExample)
EP (1) EP1429200B1 (enExample)
JP (1) JP4515744B2 (enExample)
BR (1) BR0304637A (enExample)
CA (1) CA2445742C (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040080762A1 (en) * 2002-10-25 2004-04-29 Xerox Corporation Half-tone based enhancement of black
US7048349B2 (en) 2004-01-12 2006-05-23 Xerox Corporation Color printing

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0738084B2 (ja) * 1986-08-29 1995-04-26 富士ゼロックス株式会社 画像形成方法
US5438437A (en) * 1991-10-17 1995-08-01 Konica Corporation Image forming apparatus with exposure, size, and position correction for pixels
US5252995A (en) * 1992-09-03 1993-10-12 Hewlett-Packard Company Color boundary enhancement in a multi-color electrostatic printer
ATE195689T1 (de) * 1992-10-30 2000-09-15 Canon Kk Verfahren zur herstellung eines schwarzen bildes in dem schwarze tinte farbiger tinte überlagert ist
JPH0740549A (ja) * 1993-07-26 1995-02-10 Canon Inc インクジェット記録方法および装置
JP3377302B2 (ja) * 1994-07-21 2003-02-17 株式会社リコー カラー画像形成装置
CA2154100C (en) * 1994-10-27 2000-10-24 Steven J. Harrington Image halftoning system
US5712924A (en) * 1994-11-07 1998-01-27 Mita Industrial Co., Ltd. Image processing apparatus
JP3768028B2 (ja) * 1999-04-30 2006-04-19 シャープ株式会社 画像処理方法、画像処理装置及び画像形成装置
JP2001260413A (ja) * 2000-03-14 2001-09-25 Sharp Corp 画像形成装置
JP2002099127A (ja) * 2000-09-25 2002-04-05 Konica Corp 画像形成装置と画像形成方法
JP2002108021A (ja) * 2000-09-28 2002-04-10 Konica Corp 白色トナーと画像形成装置
US6493083B2 (en) * 2000-12-15 2002-12-10 Xerox Corporation Method for measuring color registration and determining registration error in marking platform
JP2002283615A (ja) * 2001-03-23 2002-10-03 Ricoh Co Ltd 画像形成装置及び画像形成方法

Also Published As

Publication number Publication date
EP1429200A3 (en) 2010-12-22
EP1429200A2 (en) 2004-06-16
JP2004145338A (ja) 2004-05-20
US20040080572A1 (en) 2004-04-29
CA2445742A1 (en) 2004-04-25
US6742870B2 (en) 2004-06-01
JP4515744B2 (ja) 2010-08-04
EP1429200B1 (en) 2014-12-10
BR0304637A (pt) 2004-08-31

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EEER Examination request
MKLA Lapsed

Effective date: 20161021