JPS5691585A - Video signal processing method - Google Patents

Video signal processing method

Info

Publication number
JPS5691585A
JPS5691585A JP16995279A JP16995279A JPS5691585A JP S5691585 A JPS5691585 A JP S5691585A JP 16995279 A JP16995279 A JP 16995279A JP 16995279 A JP16995279 A JP 16995279A JP S5691585 A JPS5691585 A JP S5691585A
Authority
JP
Japan
Prior art keywords
signals
pattern
reference level
read
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
JP16995279A
Other languages
Japanese (ja)
Inventor
Yoshihiro Miyamoto
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16995279A priority Critical patent/JPS5691585A/en
Publication of JPS5691585A publication Critical patent/JPS5691585A/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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To enable to transmit information with middle gradations like a photograph by regarding picture elements of a video signal as a unit cycle and by setting a reference level which varies regularly within the unit cycle. CONSTITUTION:Information pattern P to be read is formed of white part P1, middle gradation parts P2-P4, black part P5. On the basis of pattern P like this, video signals 5-9 are read out in time series. For those signals 5-9, unit cycles T1-T5 are set. In those cycles T1-T5, the part from the black level to the white level is considered to be 100% and reference level saw-tooth signals 10-14 rising linearly 10%-90%, for example, are generated by reference level signal generator 4 and inputted to comparator 1. Then, comparator 1 makes comparisons at points in time corresponding to centers of video signals 5-9, picture element signals, inputted from terminal 2. Thus, a reproduced picture having five gradations, for example, correspondig to pattern P to be read can be obtained.
JP16995279A 1979-12-25 1979-12-25 Video signal processing method Pending JPS5691585A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16995279A JPS5691585A (en) 1979-12-25 1979-12-25 Video signal processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16995279A JPS5691585A (en) 1979-12-25 1979-12-25 Video signal processing method

Publications (1)

Publication Number Publication Date
JPS5691585A true JPS5691585A (en) 1981-07-24

Family

ID=15895898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16995279A Pending JPS5691585A (en) 1979-12-25 1979-12-25 Video signal processing method

Country Status (1)

Country Link
JP (1) JPS5691585A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234809A2 (en) * 1986-02-14 1987-09-02 Canon Kabushiki Kaisha Image processing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234809A2 (en) * 1986-02-14 1987-09-02 Canon Kabushiki Kaisha Image processing apparatus

Similar Documents

Publication Publication Date Title
JPS53101939A (en) Picture reading method
JPS5691585A (en) Video signal processing method
JPS5395518A (en) Facsimile input system
JPS5651158A (en) Reproducing method of binary picture
JPS5484914A (en) Letter and picture transmission system with high efficiency
JPS5356915A (en) Picture read system
JPS57168581A (en) Adaptive quantizing circuit
JPS53124013A (en) Solid state image sensor array
JPS5376815A (en) Magnetic recorder/reproducer
JPS5350610A (en) Video signal processing circuit
JPS5460829A (en) Shading corrector device
JPS5597782A (en) Solid-state pickup unit
JPS53138628A (en) Compressed data reproducing method using interpolation
JPS53119635A (en) Correcting method for digital signal
JPS5223223A (en) Method of reading bar codes
JPS5453833A (en) Arc description method
JPS5628570A (en) Video signal processing circuit
JPS555582A (en) Signal processing system for optical detector
JPS5316610A (en) Dropout signal compensation circuit
JPS5471924A (en) Binary circuit
JPS5627586A (en) Correlative tracking unit
JPS53138629A (en) Compressed data reproducing method using interpolation
JPS5294019A (en) Solid pick up unit
JPS5694875A (en) Binary signal processor
JPS5534558A (en) Signal process system for optical detector