JPS55132186A - Chroma-key signal generator - Google Patents

Chroma-key signal generator

Info

Publication number
JPS55132186A
JPS55132186A JP4000479A JP4000479A JPS55132186A JP S55132186 A JPS55132186 A JP S55132186A JP 4000479 A JP4000479 A JP 4000479A JP 4000479 A JP4000479 A JP 4000479A JP S55132186 A JPS55132186 A JP S55132186A
Authority
JP
Japan
Prior art keywords
point
circuit
chroma
key signal
signals
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
JP4000479A
Other languages
Japanese (ja)
Other versions
JPS601792B2 (en
Inventor
Masayoshi Matsuo
Yoshikatsu Araki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4000479A priority Critical patent/JPS601792B2/en
Publication of JPS55132186A publication Critical patent/JPS55132186A/en
Publication of JPS601792B2 publication Critical patent/JPS601792B2/en
Expired 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 improve the absence of a chroma-key by generating a key signal even as to a background color whose color range is narrow and low in chroma saturation, by performing the special processing of red, blue and green signals outputted from a color television camera, etc. CONSTITUTION:Red R, blue B and green G signals from a color television camera are applied to terminals 12, 11 and 13 respectively and sent to the R' point, B' point and G' point of matrix circuit 14 with low impedance. Then, the C' point and M' point are set in the matrix to obtain (B+G)/2 and (R+B)/2 respectively, and they are sent to non-addition NAM circuit 21 to extract minimum (B+G)/2 and (R+B)/2 signals. Further, subtracting circuit 22 subtracts the (R+G)/2 signal of the Y' point from the output signal of NAM circuit 21 and black clipping circuit 23 clips the difference to obtain a key signal at terminal 24.
JP4000479A 1979-04-02 1979-04-02 Chromakey signal generator Expired JPS601792B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4000479A JPS601792B2 (en) 1979-04-02 1979-04-02 Chromakey signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4000479A JPS601792B2 (en) 1979-04-02 1979-04-02 Chromakey signal generator

Publications (2)

Publication Number Publication Date
JPS55132186A true JPS55132186A (en) 1980-10-14
JPS601792B2 JPS601792B2 (en) 1985-01-17

Family

ID=12568759

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4000479A Expired JPS601792B2 (en) 1979-04-02 1979-04-02 Chromakey signal generator

Country Status (1)

Country Link
JP (1) JPS601792B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5367339A (en) * 1992-09-30 1994-11-22 Intel Corporation Black image detection circuitry

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5367339A (en) * 1992-09-30 1994-11-22 Intel Corporation Black image detection circuitry

Also Published As

Publication number Publication date
JPS601792B2 (en) 1985-01-17

Similar Documents

Publication Publication Date Title
GB2005511A (en) Colour television camera signal processing apparatus
JPS56109087A (en) Digital color encoder
JPS55132186A (en) Chroma-key signal generator
JPS56140788A (en) Color pickup device
GB1363197A (en) Correcting colour television signals
JPS55154891A (en) Automatic hue correcting circuit
JPS5558688A (en) Color correcting circuit
JPS5628580A (en) Color television camera unit
JPS5321524A (en) Chrominance components processing circuit
JPS53110325A (en) Mixed color elimination circuit
GB1281253A (en) Two-tube colour television camera system
JPS5631289A (en) Beam index type color television receiver
JPS5577286A (en) Chrominance signal generator
JPS5646382A (en) Transmission system for color video signal
JPS5263621A (en) Image signal reproducer
JPS51140430A (en) Color television camera apparatus
JPS55154894A (en) Improving circuit for frequency characteristic of color signal
JPS573483A (en) Chroma-key effect generator
JPS5650684A (en) Color television camera
JPS5797286A (en) Color solid-state image pickup device
JPS56106487A (en) Moire eliminating method of 3-electrode color camera
JPS5451717A (en) Soft chromakey system
JPS55154893A (en) Improving circuit for frequency characteristic of color signal
GB1277240A (en) Color television pick-up device
JPS56149885A (en) Color signal processing circuit