JPS648046A - Image forming device - Google Patents

Image forming device

Info

Publication number
JPS648046A
JPS648046A JP62164818A JP16481887A JPS648046A JP S648046 A JPS648046 A JP S648046A JP 62164818 A JP62164818 A JP 62164818A JP 16481887 A JP16481887 A JP 16481887A JP S648046 A JPS648046 A JP S648046A
Authority
JP
Japan
Prior art keywords
signal
image signal
image
analog
selector
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
JP62164818A
Other languages
Japanese (ja)
Other versions
JPH0794172B2 (en
Inventor
Yoji Tomoyuki
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 JP62164818A priority Critical patent/JPH0794172B2/en
Publication of JPS648046A publication Critical patent/JPS648046A/en
Priority to US07/325,022 priority patent/US4873428A/en
Publication of JPH0794172B2 publication Critical patent/JPH0794172B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N1/405—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
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To obtain a high-quality regenerated image by providing a corrected data storage means which corrects data for image signal conversion in accordance with a recording medium to be used such as a photosensitive element. CONSTITUTION:A copy 9 is read by CCD 71, an analog image signal obtained is amplified by an amplifier 72 and then is converted to a digital image signal by an A/D converter 73. Next, one of these digital image signals is selected by a selector 12 through gamma conversion tables 10, 11 which are lookup tables. Data obtained by addition and subtraction of two of DELTAgamma1-DELTAgamma4 based on a gammacurve stored in a memory 29 is stored in the gamma conversion tables 10, 11. The image signal selected by the selector 12 is again converted to an analog signal by means of the D/A converter 75. A comparator 76 compares a triangular signal of threefold cycle of an image flock with an analog image signal to form a pulse width modulation signal. This pulse width modulation signal is entered into a laser drive circuit 17.
JP62164818A 1987-03-03 1987-06-30 Image processing device Expired - Lifetime JPH0794172B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62164818A JPH0794172B2 (en) 1987-06-30 1987-06-30 Image processing device
US07/325,022 US4873428A (en) 1987-03-03 1989-03-20 Image processing apparatus using conversion means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62164818A JPH0794172B2 (en) 1987-06-30 1987-06-30 Image processing device

Publications (2)

Publication Number Publication Date
JPS648046A true JPS648046A (en) 1989-01-12
JPH0794172B2 JPH0794172B2 (en) 1995-10-11

Family

ID=15800501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62164818A Expired - Lifetime JPH0794172B2 (en) 1987-03-03 1987-06-30 Image processing device

Country Status (1)

Country Link
JP (1) JPH0794172B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0387862A (en) * 1989-08-31 1991-04-12 Canon Inc Image forming device
US5019609A (en) * 1988-08-02 1991-05-28 Aicello Chemical Co., Ltd. Films easily soluble in cold water
US5070126A (en) * 1988-08-02 1991-12-03 Aicello Chemical Co., Ltd. Films easily soluble in cold water

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61177865A (en) * 1985-02-01 1986-08-09 Seiko Epson Corp Imaging device
JPS6239972A (en) * 1985-08-15 1987-02-20 Canon Inc Picture processor
JPS6281186A (en) * 1985-10-04 1987-04-14 Hitachi Ltd Picture outputting method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61177865A (en) * 1985-02-01 1986-08-09 Seiko Epson Corp Imaging device
JPS6239972A (en) * 1985-08-15 1987-02-20 Canon Inc Picture processor
JPS6281186A (en) * 1985-10-04 1987-04-14 Hitachi Ltd Picture outputting method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5019609A (en) * 1988-08-02 1991-05-28 Aicello Chemical Co., Ltd. Films easily soluble in cold water
US5070126A (en) * 1988-08-02 1991-12-03 Aicello Chemical Co., Ltd. Films easily soluble in cold water
JPH0387862A (en) * 1989-08-31 1991-04-12 Canon Inc Image forming device

Also Published As

Publication number Publication date
JPH0794172B2 (en) 1995-10-11

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