FR2390056A1 - - Google Patents

Info

Publication number
FR2390056A1
FR2390056A1 FR7813231A FR7813231A FR2390056A1 FR 2390056 A1 FR2390056 A1 FR 2390056A1 FR 7813231 A FR7813231 A FR 7813231A FR 7813231 A FR7813231 A FR 7813231A FR 2390056 A1 FR2390056 A1 FR 2390056A1
Authority
FR
France
Prior art keywords
amplitude
signal
tilting pulse
improving
threshold value
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.)
Withdrawn
Application number
FR7813231A
Other languages
French (fr)
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.)
HELL RUDOLF GmbH
Original Assignee
HELL RUDOLF GmbH
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 HELL RUDOLF GmbH filed Critical HELL RUDOLF GmbH
Publication of FR2390056A1 publication Critical patent/FR2390056A1/fr
Withdrawn legal-status Critical Current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
    • H04N1/409—Edge or detail enhancement; Noise or error suppression
    • H04N1/4092—Edge or detail enhancement
    • 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
    • H04N1/41—Bandwidth or redundancy reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Solid State Image Pick-Up Elements (AREA)

Abstract

a. Procédé pour améliorer la qualité de l'image lors d'une transmission en fac-similé. b. Procédé caractérisé en ce que l'on augmente l'amplitude du signal-image avant d'utiliser ce signal pour former une impulsion de basculement, et on compare l'amplitude à une valeur de seuil pour obtenir l'impulsion de basculementat. Method for improving the image quality during facsimile transmission. b. Method characterized in that the amplitude of the image signal is increased before using this signal to form a tilting pulse, and the amplitude is compared with a threshold value to obtain the tilting pulse

FR7813231A 1977-05-05 1978-05-03 Withdrawn FR2390056A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2720079A DE2720079C3 (en) 1977-05-05 1977-05-05 Method for improving the image quality in facsimile transmission

Publications (1)

Publication Number Publication Date
FR2390056A1 true FR2390056A1 (en) 1978-12-01

Family

ID=6008068

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7813231A Withdrawn FR2390056A1 (en) 1977-05-05 1978-05-03

Country Status (14)

Country Link
AT (1) AT372561B (en)
AU (1) AU518941B2 (en)
BE (1) BE866727A (en)
CH (1) CH627317A5 (en)
DE (1) DE2720079C3 (en)
DK (1) DK191378A (en)
FI (1) FI781369A (en)
FR (1) FR2390056A1 (en)
GB (1) GB1604106A (en)
IT (1) IT1095722B (en)
NL (1) NL7804772A (en)
NO (1) NO781338L (en)
SE (1) SE7804769L (en)
YU (1) YU101778A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429528A1 (en) * 1978-06-19 1980-01-18 Hell Rudolf Gmbh EXPLORATION DEVICE FOR USE IN PARTICULAR FOR THE TRANSMISSION OF FACSIMILES

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589034A (en) * 1980-12-05 1986-05-13 Canon Kabushiki Kaisha Image processing apparatus
DE3441152A1 (en) * 1984-11-10 1986-05-28 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co KG, 8510 Fürth METHOD FOR MAGNETICALLY RECORDING AND PLAYING BACK TELECOMMUNICATION SIGNALS, IN PARTICULAR VIDEO TEXT AND / OR CABLE TEXT SIGNALS

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189685A (en) * 1961-04-21 1965-06-15 Philco Corp Two-level quantization system
DE1268657B (en) * 1965-07-14 1968-05-22 Hell Rudolf Dr Ing Fa Process for increasing the sharpness in the recording of reproductions of photoelectrically scanned original images
US3495032A (en) * 1968-10-07 1970-02-10 Graphic Transmission Systems I Bandwidth reduction system
US3538246A (en) * 1968-05-22 1970-11-03 Southern Pacific Transport Co Bandwidth reduction technique for analog signals
FR2125532A1 (en) * 1971-02-16 1972-09-29 Graphic Sciences Inc
FR2166170A1 (en) * 1971-12-29 1973-08-10 Xerox Corp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2114149C3 (en) * 1971-03-24 1973-09-20 Robert Bosch Fernsehanlagen Gmbh, 6100 Darmstadt Amphtude discriminator for a circuit arrangement for generating a correction signal for flank adjustment of pulses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189685A (en) * 1961-04-21 1965-06-15 Philco Corp Two-level quantization system
DE1268657B (en) * 1965-07-14 1968-05-22 Hell Rudolf Dr Ing Fa Process for increasing the sharpness in the recording of reproductions of photoelectrically scanned original images
US3538246A (en) * 1968-05-22 1970-11-03 Southern Pacific Transport Co Bandwidth reduction technique for analog signals
US3495032A (en) * 1968-10-07 1970-02-10 Graphic Transmission Systems I Bandwidth reduction system
FR2125532A1 (en) * 1971-02-16 1972-09-29 Graphic Sciences Inc
FR2166170A1 (en) * 1971-12-29 1973-08-10 Xerox Corp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429528A1 (en) * 1978-06-19 1980-01-18 Hell Rudolf Gmbh EXPLORATION DEVICE FOR USE IN PARTICULAR FOR THE TRANSMISSION OF FACSIMILES

Also Published As

Publication number Publication date
DE2720079B2 (en) 1981-01-22
IT7822932A0 (en) 1978-05-03
SE7804769L (en) 1978-11-06
NL7804772A (en) 1978-11-07
DK191378A (en) 1978-11-06
FI781369A (en) 1978-11-06
AU518941B2 (en) 1981-10-29
AT372561B (en) 1983-10-25
IT1095722B (en) 1985-08-17
CH627317A5 (en) 1981-12-31
AU3577078A (en) 1979-11-08
YU101778A (en) 1982-08-31
GB1604106A (en) 1981-12-02
BE866727A (en) 1978-09-01
DE2720079C3 (en) 1981-11-05
DE2720079A1 (en) 1978-11-09
NO781338L (en) 1978-11-07
ATA303978A (en) 1983-02-15

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Legal Events

Date Code Title Description
ST Notification of lapse