GB2013448A - Measurement of chroma key area in television systems - Google Patents

Measurement of chroma key area in television systems

Info

Publication number
GB2013448A
GB2013448A GB7901961A GB7901961A GB2013448A GB 2013448 A GB2013448 A GB 2013448A GB 7901961 A GB7901961 A GB 7901961A GB 7901961 A GB7901961 A GB 7901961A GB 2013448 A GB2013448 A GB 2013448A
Authority
GB
United Kingdom
Prior art keywords
key area
picture
measurement
line
television systems
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
GB7901961A
Other versions
GB2013448B (en
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.)
Quantel Ltd
Original Assignee
Quantel 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 Quantel Ltd filed Critical Quantel Ltd
Priority to GB7901961A priority Critical patent/GB2013448B/en
Publication of GB2013448A publication Critical patent/GB2013448A/en
Application granted granted Critical
Publication of GB2013448B publication Critical patent/GB2013448B/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

The position of each side of the key area within a television picture is measured line by line to determine the positions of the points nearest to the sides of the picture. The positions of the points nearest to the top and bottom of the picture are determined from the line by line measurements. The four position signals are used to provide an output indicative of the size and position of the key area. This output can be used as a control signal for further equipment generating a further picture which is to be inserted in the key area so that the size and position of the inserted picture is adjusted to correspond to the calculated parameters.
GB7901961A 1978-01-30 1979-01-19 Measurement of chroma key area in television systems Expired GB2013448B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7901961A GB2013448B (en) 1978-01-30 1979-01-19 Measurement of chroma key area in television systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB370278 1978-01-30
GB7901961A GB2013448B (en) 1978-01-30 1979-01-19 Measurement of chroma key area in television systems

Publications (2)

Publication Number Publication Date
GB2013448A true GB2013448A (en) 1979-08-08
GB2013448B GB2013448B (en) 1983-02-23

Family

ID=26238527

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7901961A Expired GB2013448B (en) 1978-01-30 1979-01-19 Measurement of chroma key area in television systems

Country Status (1)

Country Link
GB (1) GB2013448B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117996A (en) * 1982-03-24 1983-10-19 Ampex Spatial transformation system including key signal generator
GB2147767A (en) * 1981-05-11 1985-05-15 Canon Kk Image processing apparatus
GB2305051A (en) * 1995-09-08 1997-03-26 Orad Hi Tec Systems Ltd Automatic electronic replacement of billboards in a video image
GB2305050A (en) * 1995-09-08 1997-03-26 Orad Hi Tec Systems Ltd Determining the position of a television camera for use in a virtual studio employing chroma keying
GB2341747A (en) * 1998-07-10 2000-03-22 Fujitsu Ltd Image extraction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147767A (en) * 1981-05-11 1985-05-15 Canon Kk Image processing apparatus
GB2117996A (en) * 1982-03-24 1983-10-19 Ampex Spatial transformation system including key signal generator
GB2305051A (en) * 1995-09-08 1997-03-26 Orad Hi Tec Systems Ltd Automatic electronic replacement of billboards in a video image
GB2305050A (en) * 1995-09-08 1997-03-26 Orad Hi Tec Systems Ltd Determining the position of a television camera for use in a virtual studio employing chroma keying
GB2305051B (en) * 1995-09-08 2000-06-21 Orad Hi Tec Systems Ltd Method and apparatus for automatic electronic replacement of billboards in a video image
GB2341747A (en) * 1998-07-10 2000-03-22 Fujitsu Ltd Image extraction
GB2341747B (en) * 1998-07-10 2002-11-20 Fujitsu Ltd Image processing apparatus, image processing method and recording medium
US6879704B2 (en) 1998-07-10 2005-04-12 Fujitsu Limited Image processing apparatus, image processing method and recording medium

Also Published As

Publication number Publication date
GB2013448B (en) 1983-02-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee