JPS5671374A - Video recording method - Google Patents

Video recording method

Info

Publication number
JPS5671374A
JPS5671374A JP14816479A JP14816479A JPS5671374A JP S5671374 A JPS5671374 A JP S5671374A JP 14816479 A JP14816479 A JP 14816479A JP 14816479 A JP14816479 A JP 14816479A JP S5671374 A JPS5671374 A JP S5671374A
Authority
JP
Japan
Prior art keywords
output
signal
density
input
video signal
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
JP14816479A
Other languages
Japanese (ja)
Inventor
Yoshihiko Okamoto
Yuji Ohara
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP14816479A priority Critical patent/JPS5671374A/en
Publication of JPS5671374A publication Critical patent/JPS5671374A/en
Pending 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]

Abstract

PURPOSE:To perform accurate reproduction of density, by converting the input video signal including intermediate tone to a signal consisting of a value of level less than optical density level value of the recording means and making the relation between the area at the black part and the visual density linear, through the pulse modulation of the input video signal. CONSTITUTION:The input video signal I including intermediate tone is input from an input terminal 1 to one input terminal of the 1st comparison circuit 2 and the 2nd comparison circuit 3, and the 1st and 2nd screen signals S1, S2 of saw-tooth wave shape having different levels from a screening signal generator 4 are respectively fed to other input terminals of the circuits 2, 3. Further, in the circuits 2, 3, the input video signal I and the signals S1, S2 are compared. The 1st ON/OFF signal W1 is output to the output of the circuit 2 and the 2nd ON/OFF signal W2 is output to the output of the circuit 3, the respective output is fed to an adder 9 via resistors 7, 8, and a recording signal is output to the output terminal 10 of the adder 9, to make linear the relation between the area of black part and the visual density, allowing to improve the high density part and to enable accurate density reproduction.
JP14816479A 1979-11-15 1979-11-15 Video recording method Pending JPS5671374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14816479A JPS5671374A (en) 1979-11-15 1979-11-15 Video recording method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14816479A JPS5671374A (en) 1979-11-15 1979-11-15 Video recording method

Publications (1)

Publication Number Publication Date
JPS5671374A true JPS5671374A (en) 1981-06-13

Family

ID=15446674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14816479A Pending JPS5671374A (en) 1979-11-15 1979-11-15 Video recording method

Country Status (1)

Country Link
JP (1) JPS5671374A (en)

Cited By (7)

* 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
JPS62195978A (en) * 1986-02-24 1987-08-29 Fuji Photo Film Co Ltd Optical scanning recorder
JPS62292074A (en) * 1986-06-11 1987-12-18 Canon Inc Picture recording device
US4835781A (en) * 1987-02-25 1989-05-30 Fuji Photo Film Co., Ltd. Drooping elimination device for semiconductor laser
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US4905022A (en) * 1988-04-08 1990-02-27 Ricoh Company, Ltd. Image forming apparatus having laser light source
US5124835A (en) * 1989-06-21 1992-06-23 Ricoh Company, Ltd. Optical scanning apparatus

Cited By (7)

* 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
JPS62195978A (en) * 1986-02-24 1987-08-29 Fuji Photo Film Co Ltd Optical scanning recorder
JPS62292074A (en) * 1986-06-11 1987-12-18 Canon Inc Picture recording device
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US4835781A (en) * 1987-02-25 1989-05-30 Fuji Photo Film Co., Ltd. Drooping elimination device for semiconductor laser
US4905022A (en) * 1988-04-08 1990-02-27 Ricoh Company, Ltd. Image forming apparatus having laser light source
US5124835A (en) * 1989-06-21 1992-06-23 Ricoh Company, Ltd. Optical scanning apparatus

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