FR2538654B1 - Procede et appareil pour la commande des niveaux de gris representes par un signal video - Google Patents

Procede et appareil pour la commande des niveaux de gris representes par un signal video

Info

Publication number
FR2538654B1
FR2538654B1 FR8020223A FR8020223A FR2538654B1 FR 2538654 B1 FR2538654 B1 FR 2538654B1 FR 8020223 A FR8020223 A FR 8020223A FR 8020223 A FR8020223 A FR 8020223A FR 2538654 B1 FR2538654 B1 FR 2538654B1
Authority
FR
France
Prior art keywords
video signal
gray levels
levels represented
controlling gray
controlling
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.)
Expired
Application number
FR8020223A
Other languages
English (en)
Other versions
FR2538654A1 (fr
Inventor
Philip Valentine Coates
Brian John Eaton
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Publication of FR2538654A1 publication Critical patent/FR2538654A1/fr
Application granted granted Critical
Publication of FR2538654B1 publication Critical patent/FR2538654B1/fr
Expired 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
    • H04N23/23—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only from thermal infrared radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Image Processing (AREA)
  • Television Receiver Circuits (AREA)
FR8020223A 1979-09-21 1980-09-19 Procede et appareil pour la commande des niveaux de gris representes par un signal video Expired FR2538654B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7932777 1979-09-21

Publications (2)

Publication Number Publication Date
FR2538654A1 FR2538654A1 (fr) 1984-06-29
FR2538654B1 true FR2538654B1 (fr) 1988-12-09

Family

ID=10507977

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8020223A Expired FR2538654B1 (fr) 1979-09-21 1980-09-19 Procede et appareil pour la commande des niveaux de gris representes par un signal video

Country Status (3)

Country Link
US (1) US4682229A (fr)
DE (1) DE3035532A1 (fr)
FR (1) FR2538654B1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0824678B2 (ja) * 1985-11-02 1996-03-13 株式会社東芝 超音波診断装置
JPS62266039A (ja) * 1986-05-14 1987-11-18 株式会社東芝 超音波診断装置
FR2633746A1 (fr) * 1988-07-01 1990-01-05 Labo Electronique Physique Methode numerique de modification d'image et systeme de mise en oeuvre
US5388168A (en) * 1990-11-19 1995-02-07 Matsushita Electric Industrial Co., Ltd. Picture quality improving circuit using a cumulative histogram
DE4211133C2 (de) * 1992-04-03 2003-03-13 Zeiss Carl Automatische Kontrast- und Helligkeitsregelung für in Flugzeuge integrierte Wärmebildgeräte
JP3130266B2 (ja) * 1996-03-09 2001-01-31 三星電子株式会社 平均分離ヒストグラム等化を用いる映像改善方法及びその回路
US6792141B2 (en) * 2001-04-19 2004-09-14 Raytheon Company Infrared detection system and method with histogram based manual level and gain control with local gain clipping
US8050512B2 (en) * 2004-11-16 2011-11-01 Sharp Laboratories Of America, Inc. High dynamic range images from low dynamic range images

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979555A (en) * 1975-05-27 1976-09-07 Hughes Aircraft Company Histogram equalization system for display improvement
US3983320A (en) * 1975-08-25 1976-09-28 Hughes Aircraft Company Raster display histogram equalization
US3996421A (en) * 1975-09-02 1976-12-07 Hughes Aircraft Company Television display utilizing local area brightness control
NL7801727A (nl) * 1978-02-16 1979-08-20 Hollandse Signaalapparaten Bv Drempelspanningsselectieschakeling.

Also Published As

Publication number Publication date
DE3035532C2 (fr) 1988-09-15
DE3035532A1 (de) 1986-07-03
US4682229A (en) 1987-07-21
FR2538654A1 (fr) 1984-06-29

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Legal Events

Date Code Title Description
ST Notification of lapse