JPS5767388A - Chromakey device - Google Patents

Chromakey device

Info

Publication number
JPS5767388A
JPS5767388A JP14404580A JP14404580A JPS5767388A JP S5767388 A JPS5767388 A JP S5767388A JP 14404580 A JP14404580 A JP 14404580A JP 14404580 A JP14404580 A JP 14404580A JP S5767388 A JPS5767388 A JP S5767388A
Authority
JP
Japan
Prior art keywords
hue
outputted
theta
digital data
video signal
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
JP14404580A
Other languages
Japanese (ja)
Inventor
Norihisa Shirota
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP14404580A priority Critical patent/JPS5767388A/en
Publication of JPS5767388A publication Critical patent/JPS5767388A/en
Pending 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
    • H04N9/74—Circuits for processing colour signals for obtaining special effects
    • H04N9/75—Chroma key

Abstract

PURPOSE:To reduce the influence of quantizing errors in a component type chromakey device by using a tangent or a cotangent properly according to the value of hue theta. CONSTITUTION:The digital data (u) of the U axis of an original video signal and the digital data (v) of the V axis are applied from terminals 1 respectively. These data are sent to multiplexers 5, 6 through latch circuits 3, 4 respectively. On the other hand, the luminance information of the original video signal are outputted from a terminal 31. A digital data theta indicating the hue to be chromakeyed is sent from a terminal 7 to a read-only memory (ROM)8 and an H or L signal is outputted according to the value of theta. When a comparator 14 detects the coincidence of hue by comparing v: u tantheta with u: v cottheta, a comparing circuit 16 detects the saturation factor of colors is larger than the set value and both the detection signals are outputted, the original video signal is switched to video signals from input terminals 25, 30, 37, performing chromakey.
JP14404580A 1980-10-15 1980-10-15 Chromakey device Pending JPS5767388A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14404580A JPS5767388A (en) 1980-10-15 1980-10-15 Chromakey device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14404580A JPS5767388A (en) 1980-10-15 1980-10-15 Chromakey device

Publications (1)

Publication Number Publication Date
JPS5767388A true JPS5767388A (en) 1982-04-23

Family

ID=15353033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14404580A Pending JPS5767388A (en) 1980-10-15 1980-10-15 Chromakey device

Country Status (1)

Country Link
JP (1) JPS5767388A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972285A (en) * 1982-10-18 1984-04-24 Nec Corp Chromakey signal generator
EP0162502A2 (en) * 1984-04-26 1985-11-27 Philips Electronics Uk Limited Generating a chroma keying signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972285A (en) * 1982-10-18 1984-04-24 Nec Corp Chromakey signal generator
JPH0212435B2 (en) * 1982-10-18 1990-03-20 Nippon Electric Co
EP0162502A2 (en) * 1984-04-26 1985-11-27 Philips Electronics Uk Limited Generating a chroma keying signal

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