JPS55135492A - Gamma correction system for color pickup device - Google Patents

Gamma correction system for color pickup device

Info

Publication number
JPS55135492A
JPS55135492A JP4279079A JP4279079A JPS55135492A JP S55135492 A JPS55135492 A JP S55135492A JP 4279079 A JP4279079 A JP 4279079A JP 4279079 A JP4279079 A JP 4279079A JP S55135492 A JPS55135492 A JP S55135492A
Authority
JP
Japan
Prior art keywords
signal
signals
gamma correction
color
mean 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.)
Granted
Application number
JP4279079A
Other languages
Japanese (ja)
Other versions
JPS6158077B2 (en
Inventor
Masanobu Morishita
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
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4279079A priority Critical patent/JPS55135492A/en
Publication of JPS55135492A publication Critical patent/JPS55135492A/en
Publication of JPS6158077B2 publication Critical patent/JPS6158077B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

Abstract

PURPOSE:To improve the gamma correction by compounding the red, green and blue signals plus the mean value signal of these color signals via the white, Cyan and yellow beam components each and then using the mean value signal for the control signal of the gamma correction. CONSTITUTION:White signal W, yellow signal Ye and cyan signal Cy are supplied to matrix circuit 4 from input terminals 1, 2 and 3. And the compounding is given among luminance signal Y, two types of color difference signals R-Y and B-Y, red signal R, green signal G and blue signal B respectively. Signal Y is supplied to mixer 8 via gamma correction circuit 5. Signals R-Y and B-Y are turned into the chrominance signals through modulator 6 to be transmitted to gain controller 9. Signals R, G and B are turned into the mean value signals through mean vlaue compounder 7, converted into the correction signal for gamma correction via polarity inverter 10, made equal to the chrominance signal when the gamma correction is given at controller 9, and then mixed with signal Y at mixer 8. Thus the color TV signals are compounded to be transmitted through output terminal 11.
JP4279079A 1979-04-09 1979-04-09 Gamma correction system for color pickup device Granted JPS55135492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4279079A JPS55135492A (en) 1979-04-09 1979-04-09 Gamma correction system for color pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4279079A JPS55135492A (en) 1979-04-09 1979-04-09 Gamma correction system for color pickup device

Publications (2)

Publication Number Publication Date
JPS55135492A true JPS55135492A (en) 1980-10-22
JPS6158077B2 JPS6158077B2 (en) 1986-12-10

Family

ID=12645750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4279079A Granted JPS55135492A (en) 1979-04-09 1979-04-09 Gamma correction system for color pickup device

Country Status (1)

Country Link
JP (1) JPS55135492A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6215529B1 (en) 1997-03-06 2001-04-10 Matsushita Electric Industrial Co. Ltd. Gamma compensation apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6215529B1 (en) 1997-03-06 2001-04-10 Matsushita Electric Industrial Co. Ltd. Gamma compensation apparatus

Also Published As

Publication number Publication date
JPS6158077B2 (en) 1986-12-10

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