DE69421121D1 - Farbvideokamera mit Gradationsverbesserung des dunklen Signalpegels - Google Patents

Farbvideokamera mit Gradationsverbesserung des dunklen Signalpegels

Info

Publication number
DE69421121D1
DE69421121D1 DE69421121T DE69421121T DE69421121D1 DE 69421121 D1 DE69421121 D1 DE 69421121D1 DE 69421121 T DE69421121 T DE 69421121T DE 69421121 T DE69421121 T DE 69421121T DE 69421121 D1 DE69421121 D1 DE 69421121D1
Authority
DE
Germany
Prior art keywords
video camera
signal level
color video
dark signal
gradation improvement
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 - Lifetime
Application number
DE69421121T
Other languages
English (en)
Other versions
DE69421121T2 (de
Inventor
Kenji Ishii
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Publication of DE69421121D1 publication Critical patent/DE69421121D1/de
Application granted granted Critical
Publication of DE69421121T2 publication Critical patent/DE69421121T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Color Television Image Signal Generators (AREA)
DE69421121T 1993-06-30 1994-06-28 Farbvideokamera mit Gradationsverbesserung des dunklen Signalpegels Expired - Lifetime DE69421121T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18880093 1993-06-30

Publications (2)

Publication Number Publication Date
DE69421121D1 true DE69421121D1 (de) 1999-11-18
DE69421121T2 DE69421121T2 (de) 2000-04-13

Family

ID=16230028

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69421121T Expired - Lifetime DE69421121T2 (de) 1993-06-30 1994-06-28 Farbvideokamera mit Gradationsverbesserung des dunklen Signalpegels

Country Status (3)

Country Link
US (1) US5684533A (de)
EP (1) EP0632647B1 (de)
DE (1) DE69421121T2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ295874B6 (cs) * 1997-03-06 2005-11-16 Matsushita Electric Industrial Co., Ltd. Zařízení pro gama kompenzaci
US6816200B1 (en) 1998-08-31 2004-11-09 Neostar, Inc. Method and apparatus for detecting camera sensor intensity saturation
US6826303B2 (en) * 2001-06-28 2004-11-30 Hewlett-Packard Development Company, L.P. Software-based acceleration color correction filtering system
JP5292829B2 (ja) * 2008-01-25 2013-09-18 株式会社ニコン 撮像装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB702321A (en) * 1949-07-21 1954-01-13 Emi Ltd Improvements relating to non-linear electrical control circuits
NL7714398A (nl) * 1977-12-27 1979-06-29 Philips Nv Schakeling voor het in hoofdzaak nabij een referentieniveau vergroten van een signaal- helling van een periodiek optredend signaal.
JPS56107674A (en) * 1980-01-31 1981-08-26 Sony Corp Gradation correcting device of video signal
DE3326272C1 (de) * 1983-07-21 1985-04-18 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co KG, 8510 Fürth Verfahren und Schaltungsanordnung zur Verbesserung der Qualitaet eines Fernsehbildes
US4969045A (en) * 1988-05-20 1990-11-06 Sanyo Electric Co., Ltd. Image sensing apparatus having automatic iris function of automatically adjusting exposure in response to video signal
US5068718A (en) * 1988-11-04 1991-11-26 Fuji Photo Film Co., Ltd. Image quality correcting system for use with an imaging apparatus
JPH03274870A (ja) * 1990-03-24 1991-12-05 Sony Corp ビデオカメラのアイリス制御装置

Also Published As

Publication number Publication date
DE69421121T2 (de) 2000-04-13
US5684533A (en) 1997-11-04
EP0632647B1 (de) 1999-10-13
EP0632647A1 (de) 1995-01-04

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition