JPS5726873A - Control device for image density - Google Patents

Control device for image density

Info

Publication number
JPS5726873A
JPS5726873A JP10150380A JP10150380A JPS5726873A JP S5726873 A JPS5726873 A JP S5726873A JP 10150380 A JP10150380 A JP 10150380A JP 10150380 A JP10150380 A JP 10150380A JP S5726873 A JPS5726873 A JP S5726873A
Authority
JP
Japan
Prior art keywords
density
adjustment
picture
accordance
processing circuit
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.)
Pending
Application number
JP10150380A
Other languages
Japanese (ja)
Inventor
Yukio Sato
Toshihiko Nakazawa
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 JP10150380A priority Critical patent/JPS5726873A/en
Publication of JPS5726873A publication Critical patent/JPS5726873A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
    • G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
    • G03G15/04072—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by laser

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To make sufficient gradation adjustment possible irrespectively of an input picture signal in accordance with the sensivitiy degradation and the like of a photoreceptor by adjusting the picture spot information density formed by a dither processing circuit by selecting a threshold value in addition to exposure adjustment. CONSTITUTION:Comparators Q0... of set resistance R0... according to density threshold values are provided to a dither processing circuit, and the picture spot information M formed of the density signals D1... of matrix configuration is formed successively by a dither processing circuit in accordance with the input picture information. The picture spot information of the matrixes M... formed by the prescribed signals D1... is selected in accordance with the density adjustment commands applied to selection circuits SL1, SL2. Hence, besides the exposure adjustment such as exposure time, the adjustment of picture density insufficient with this adjustment is carried out in the dither processing circuit as well. As a result, the sufficient gradation adjustment of pictures is accomplished in accordance with the density degradation and the like of a photoreceptor irrespectively of the input picture signals.
JP10150380A 1980-07-24 1980-07-24 Control device for image density Pending JPS5726873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10150380A JPS5726873A (en) 1980-07-24 1980-07-24 Control device for image density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10150380A JPS5726873A (en) 1980-07-24 1980-07-24 Control device for image density

Publications (1)

Publication Number Publication Date
JPS5726873A true JPS5726873A (en) 1982-02-13

Family

ID=14302414

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10150380A Pending JPS5726873A (en) 1980-07-24 1980-07-24 Control device for image density

Country Status (1)

Country Link
JP (1) JPS5726873A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016068A (en) * 1983-07-07 1985-01-26 Canon Inc Picture processor
JPS61161070A (en) * 1985-01-08 1986-07-21 Fuji Xerox Co Ltd Image data storage device
JPH027667A (en) * 1989-04-06 1990-01-11 Canon Inc Picture processing unit
US5666444A (en) * 1982-04-06 1997-09-09 Canon Kabushiki Kaisha Image processing apparatus
US5712929A (en) * 1982-04-06 1998-01-27 Canon Kabushiki Kaisha Image processing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52106737A (en) * 1976-03-04 1977-09-07 Canon Inc Picture recorder
JPS5553971A (en) * 1978-10-16 1980-04-19 Oki Electric Ind Co Ltd Facsimile graphic input device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52106737A (en) * 1976-03-04 1977-09-07 Canon Inc Picture recorder
JPS5553971A (en) * 1978-10-16 1980-04-19 Oki Electric Ind Co Ltd Facsimile graphic input device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5666444A (en) * 1982-04-06 1997-09-09 Canon Kabushiki Kaisha Image processing apparatus
US5712929A (en) * 1982-04-06 1998-01-27 Canon Kabushiki Kaisha Image processing apparatus
JPS6016068A (en) * 1983-07-07 1985-01-26 Canon Inc Picture processor
JPS61161070A (en) * 1985-01-08 1986-07-21 Fuji Xerox Co Ltd Image data storage device
JPH0525424B2 (en) * 1985-01-08 1993-04-12 Fuji Xerox Co Ltd
JPH027667A (en) * 1989-04-06 1990-01-11 Canon Inc Picture processing unit

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