JPS5550795A - Rbg chroma key signal generator - Google Patents

Rbg chroma key signal generator

Info

Publication number
JPS5550795A
JPS5550795A JP12409078A JP12409078A JPS5550795A JP S5550795 A JPS5550795 A JP S5550795A JP 12409078 A JP12409078 A JP 12409078A JP 12409078 A JP12409078 A JP 12409078A JP S5550795 A JPS5550795 A JP S5550795A
Authority
JP
Japan
Prior art keywords
signal
signals
gain
circuit
arbitrary
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.)
Pending
Application number
JP12409078A
Other languages
Japanese (ja)
Inventor
Yasunobu Segawa
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP12409078A priority Critical patent/JPS5550795A/en
Publication of JPS5550795A publication Critical patent/JPS5550795A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE: To carry out the automatic adjustment of white balance by extracting arbitrary specific position of the television image surface as the marker and carrying out the gain adjustment of other signals as reference of the arbitrary signal of the portion of the marker.
CONSTITUTION: The gate pulse synchronizing with the image signal is generated in the gate pulse generating circuit 11, outputted to the gate circuits 7∼9 to determine the arbitrary position of the image surface. The gate circuits 7∼9 receives the gate pulse and outputs B, G, R signals of the specific portion of the image surface as the marker to the level difference detection and control circuit 10. As reference to the arbitrary signals B, G, R, the gain adjusting signal for adjusting the gain of two signals is formed in the circuit 10 to output to the gain adjusting circuit 1∼3. In the circuit 1∼3, B, G, R signals are adjusted in gain so as to reach the same level of B, G, R signal. Accordingly, the B, G, R signal inputting to the matrix 4 is situated at the same level and the output thereof is no signal, so that it can be made white or grey.
COPYRIGHT: (C)1980,JPO&Japio
JP12409078A 1978-10-11 1978-10-11 Rbg chroma key signal generator Pending JPS5550795A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12409078A JPS5550795A (en) 1978-10-11 1978-10-11 Rbg chroma key signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12409078A JPS5550795A (en) 1978-10-11 1978-10-11 Rbg chroma key signal generator

Publications (1)

Publication Number Publication Date
JPS5550795A true JPS5550795A (en) 1980-04-12

Family

ID=14876670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12409078A Pending JPS5550795A (en) 1978-10-11 1978-10-11 Rbg chroma key signal generator

Country Status (1)

Country Link
JP (1) JPS5550795A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6234494A (en) * 1985-08-07 1987-02-14 Canon Inc Video signal processor
US4679067A (en) * 1984-04-09 1987-07-07 Corporate Communications Consultants, Inc. Color correction system and method with localized color sampling
US5182636A (en) * 1990-02-15 1993-01-26 Sony Corporation Color video camera with auto-white balance control
US5282024A (en) * 1989-08-23 1994-01-25 Canon Kabushiki Kaisha White balance correction device
JPH0713540A (en) * 1993-06-21 1995-01-17 Nec Corp Transparent color processing circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679067A (en) * 1984-04-09 1987-07-07 Corporate Communications Consultants, Inc. Color correction system and method with localized color sampling
JPS6234494A (en) * 1985-08-07 1987-02-14 Canon Inc Video signal processor
US5282024A (en) * 1989-08-23 1994-01-25 Canon Kabushiki Kaisha White balance correction device
US5182636A (en) * 1990-02-15 1993-01-26 Sony Corporation Color video camera with auto-white balance control
JPH0713540A (en) * 1993-06-21 1995-01-17 Nec Corp Transparent color processing circuit

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