JP4996378B2 - 画像形成装置 - Google Patents

画像形成装置 Download PDF

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Publication number
JP4996378B2
JP4996378B2 JP2007181442A JP2007181442A JP4996378B2 JP 4996378 B2 JP4996378 B2 JP 4996378B2 JP 2007181442 A JP2007181442 A JP 2007181442A JP 2007181442 A JP2007181442 A JP 2007181442A JP 4996378 B2 JP4996378 B2 JP 4996378B2
Authority
JP
Japan
Prior art keywords
density
pattern
image
pwm pattern
measurement
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
JP2007181442A
Other languages
English (en)
Japanese (ja)
Other versions
JP2009021711A (ja
JP2009021711A5 (enExample
Inventor
譲 矢野
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2007181442A priority Critical patent/JP4996378B2/ja
Priority to US12/170,241 priority patent/US8130414B2/en
Publication of JP2009021711A publication Critical patent/JP2009021711A/ja
Publication of JP2009021711A5 publication Critical patent/JP2009021711A5/ja
Application granted granted Critical
Publication of JP4996378B2 publication Critical patent/JP4996378B2/ja
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1223—Resolution control, enlarging or reducing, edge or detail enhancement
    • 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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
    • 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]
    • 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
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • 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
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00037—Toner image detection
    • 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
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00037—Toner image detection
    • G03G2215/00042—Optical detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color, Gradation (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP2007181442A 2007-07-10 2007-07-10 画像形成装置 Expired - Fee Related JP4996378B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2007181442A JP4996378B2 (ja) 2007-07-10 2007-07-10 画像形成装置
US12/170,241 US8130414B2 (en) 2007-07-10 2008-07-09 Image forming apparatus using a density pattern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007181442A JP4996378B2 (ja) 2007-07-10 2007-07-10 画像形成装置

Publications (3)

Publication Number Publication Date
JP2009021711A JP2009021711A (ja) 2009-01-29
JP2009021711A5 JP2009021711A5 (enExample) 2010-08-26
JP4996378B2 true JP4996378B2 (ja) 2012-08-08

Family

ID=40252838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007181442A Expired - Fee Related JP4996378B2 (ja) 2007-07-10 2007-07-10 画像形成装置

Country Status (2)

Country Link
US (1) US8130414B2 (enExample)
JP (1) JP4996378B2 (enExample)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3049684B2 (ja) * 1993-12-10 2000-06-05 京セラミタ株式会社 画像形成装置、および画像形成装置の出力階調調整方法
JPH11295942A (ja) * 1998-04-09 1999-10-29 Canon Inc 画像形成装置
JP2000316088A (ja) * 1999-04-28 2000-11-14 Sharp Corp 画像形成装置
JP2000350025A (ja) * 1999-06-02 2000-12-15 Canon Inc 画像処理方法及び装置
JP2002044455A (ja) * 2000-07-27 2002-02-08 Hitachi Ltd カラーレーザプリンタのキャリブレーション方法及びテストチャート
JP4107634B2 (ja) * 2000-08-09 2008-06-25 株式会社リコー 画像形成装置
JP4060624B2 (ja) * 2002-04-02 2008-03-12 東芝テック株式会社 画像形成装置
JP4134909B2 (ja) * 2004-01-13 2008-08-20 コニカミノルタビジネステクノロジーズ株式会社 ディザパターン生成装置、ディザパターン生成方法、およびディザパターン生成プログラム
JP2006074305A (ja) * 2004-09-01 2006-03-16 Ricoh Co Ltd 階調再現方法、画像形成装置及びプリンタドライバ
JP2006159890A (ja) * 2004-11-09 2006-06-22 Fuji Xerox Co Ltd 画像形成装置

Also Published As

Publication number Publication date
US20090015853A1 (en) 2009-01-15
JP2009021711A (ja) 2009-01-29
US8130414B2 (en) 2012-03-06

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