JPS6467345A - Image forming system - Google Patents

Image forming system

Info

Publication number
JPS6467345A
JPS6467345A JP62223119A JP22311987A JPS6467345A JP S6467345 A JPS6467345 A JP S6467345A JP 62223119 A JP62223119 A JP 62223119A JP 22311987 A JP22311987 A JP 22311987A JP S6467345 A JPS6467345 A JP S6467345A
Authority
JP
Japan
Prior art keywords
image
pixel
outputted
circuit
density
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.)
Granted
Application number
JP62223119A
Other languages
Japanese (ja)
Other versions
JP2765838B2 (en
Inventor
Toshinori Ando
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 JP62223119A priority Critical patent/JP2765838B2/en
Publication of JPS6467345A publication Critical patent/JPS6467345A/en
Application granted granted Critical
Publication of JP2765838B2 publication Critical patent/JP2765838B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Color, Gradation (AREA)
  • Laser Beam Printer (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Dot-Matrix Printers And Others (AREA)

Abstract

PURPOSE:To obtain an image forming apparatus always forming a good output image, by mounting a selection means for selecting one of pulse width modulation means on the basis of the detection result of a detection means for detecting the change in the density of the pixel in image data. CONSTITUTION:An operation circuit 3 performs operation on the basis of the pixel density values stored in latches 1, 2 in order to discriminate image tone at every pixel. When the density difference between adjacent pixels is a predetermined value or more, the signal obtained in a system consisting of a gradation correcting circuit 5, a triangle wave generating circuit 6 and a comparator 7 is selected to be outputted and, when said density difference is the predetermined value or less, the signal obtained in a systems consisting of a gradation correcting circuit 8, a triangle wave generating circuit 9 and a comparator 10 is selected to be outputted. As a result, the driving of laser is controlled based on the pulse signal outputted from a multiplexer 11 and an output image is formed through a stage of 'electrostatic image formation development fixing'. Therefore, even when a line image such as a character or mark and an medium contrast image such as a photograph are present in a mixed state, the edge processing suitable for said images is performed and a good output image can be formed.
JP62223119A 1987-09-08 1987-09-08 Image processing device Expired - Lifetime JP2765838B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62223119A JP2765838B2 (en) 1987-09-08 1987-09-08 Image processing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62223119A JP2765838B2 (en) 1987-09-08 1987-09-08 Image processing device

Publications (2)

Publication Number Publication Date
JPS6467345A true JPS6467345A (en) 1989-03-14
JP2765838B2 JP2765838B2 (en) 1998-06-18

Family

ID=16793116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62223119A Expired - Lifetime JP2765838B2 (en) 1987-09-08 1987-09-08 Image processing device

Country Status (1)

Country Link
JP (1) JP2765838B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0879516A (en) * 1994-09-01 1996-03-22 Fuji Xerox Co Ltd Image processor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605669A (en) * 1983-06-24 1985-01-12 Canon Inc Multi-value output system
JPS6239975A (en) * 1985-08-15 1987-02-20 Canon Inc Picture processor
JPS6249780A (en) * 1985-08-29 1987-03-04 Canon Inc Picture information processor
JPS62101177A (en) * 1985-10-28 1987-05-11 Canon Inc Picture processor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS605669A (en) * 1983-06-24 1985-01-12 Canon Inc Multi-value output system
JPS6239975A (en) * 1985-08-15 1987-02-20 Canon Inc Picture processor
JPS6249780A (en) * 1985-08-29 1987-03-04 Canon Inc Picture information processor
JPS62101177A (en) * 1985-10-28 1987-05-11 Canon Inc Picture processor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0879516A (en) * 1994-09-01 1996-03-22 Fuji Xerox Co Ltd Image processor

Also Published As

Publication number Publication date
JP2765838B2 (en) 1998-06-18

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