FR2410404A1 - Circuit de correction de gamma pour television - Google Patents

Circuit de correction de gamma pour television

Info

Publication number
FR2410404A1
FR2410404A1 FR7833436A FR7833436A FR2410404A1 FR 2410404 A1 FR2410404 A1 FR 2410404A1 FR 7833436 A FR7833436 A FR 7833436A FR 7833436 A FR7833436 A FR 7833436A FR 2410404 A1 FR2410404 A1 FR 2410404A1
Authority
FR
France
Prior art keywords
gamma
television
signal
correction circuit
white level
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Withdrawn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
FR7833436A
Other languages
English (en)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2410404A1 publication Critical patent/FR2410404A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

CIRCUIT DE CORRECTION DE GAMMA POUR TELEVISION DANS LEQUEL UN CORRECTEUR DE GAMMA DELIVRE UN SIGNAL DE SORTIE AVEC UN GAMMA MINIMAL DE DEUX, TANDIS QUE, PAR RAPPORT A UN SIGNAL D'ENTREE LINEAIRE QUI EST LIMITE AU NIVEAU DU BLANC PAR UN CIRCUIT DE LIMITATION DE SIGNAL, ON DERIVE UN SIGNAL DE CORRECTION AYANT UNIQUEMENT DES VALEURS POSITIVES ET SERVANT A AUGMENTER LE GAMMA DU SIGNAL DE SORTIE DU CORRECTEUR DE GAMMA. ON EVITE AINSI QUE, LORS DE DEPASSEMENTS DU NIVEAU DU BLANC PROVOQUES PAR DES DETAILS DE SCENE, LA VISUALISATION DE LA SCENE SE FASSE AVEC UNE LUMINOSITE D'IMAGE PLUS BASSE QUE CELLE CORRESPONDANT AU NIVEAU DU BLANC. APPLICATION AUX TELEVISEURS EN NOIR ET BLANC.
FR7833436A 1977-11-28 1978-11-27 Circuit de correction de gamma pour television Withdrawn FR2410404A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7713052A NL7713052A (nl) 1977-11-28 1977-11-28 Gammacorrectieschakeling voor televisie.

Publications (1)

Publication Number Publication Date
FR2410404A1 true FR2410404A1 (fr) 1979-06-22

Family

ID=19829631

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7833436A Withdrawn FR2410404A1 (fr) 1977-11-28 1978-11-27 Circuit de correction de gamma pour television

Country Status (9)

Country Link
US (1) US4227216A (fr)
JP (1) JPS5483310A (fr)
CA (1) CA1128652A (fr)
DE (1) DE2850857A1 (fr)
FR (1) FR2410404A1 (fr)
GB (1) GB2009557B (fr)
IT (1) IT1100199B (fr)
NL (1) NL7713052A (fr)
SE (1) SE7812106L (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140230C2 (de) * 1981-10-09 1989-08-31 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur wahlweisen Regelung der Gradation von Fernsehsignalen
NL8200667A (nl) * 1982-02-19 1983-09-16 Philips Nv Gammakorrektieschakeling voor televisie.
JPS627290A (ja) * 1985-07-04 1987-01-14 Fuji Photo Film Co Ltd カラ−ネガフイルム撮像における階調補正方法および装置
GB2211045B (en) * 1987-10-10 1991-08-21 Marconi Co Ltd Linearity adjusting circuit
GB2240001B (en) * 1990-01-16 1993-12-22 Rank Cintel Ltd Film characteristic simulator
GB2250886B (en) * 1990-12-13 1995-06-14 Rank Cintel Ltd Noise reduction in video signals
US6680755B2 (en) * 2001-04-05 2004-01-20 Industrial Technology Research Institute Adjustable biased gamma-correction circuit with central-symmetry voltage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970774A (en) * 1975-03-31 1976-07-20 Rca Corporation Electronic signal mixer
GB1549769A (en) * 1975-08-06 1979-08-08 Rca Corp Negative gamma circuit
CA1101943A (fr) * 1975-10-22 1981-05-26 Frederik J. Van Roessel Circuit de commutation video

Also Published As

Publication number Publication date
GB2009557B (en) 1982-07-07
SE7812106L (sv) 1979-05-29
IT7830196A0 (it) 1978-11-24
US4227216A (en) 1980-10-07
IT1100199B (it) 1985-09-28
NL7713052A (nl) 1979-05-30
CA1128652A (fr) 1982-07-27
GB2009557A (en) 1979-06-13
JPS5483310A (en) 1979-07-03
DE2850857A1 (de) 1979-05-31

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Legal Events

Date Code Title Description
ST Notification of lapse