GB2015294A - Noise reduction in colour television signals - Google Patents

Noise reduction in colour television signals

Info

Publication number
GB2015294A
GB2015294A GB7844884A GB7844884A GB2015294A GB 2015294 A GB2015294 A GB 2015294A GB 7844884 A GB7844884 A GB 7844884A GB 7844884 A GB7844884 A GB 7844884A GB 2015294 A GB2015294 A GB 2015294A
Authority
GB
United Kingdom
Prior art keywords
video
incoming
difference
motion
exceeds
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
GB7844884A
Other versions
GB2015294B (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.)
CBS Broadcasting Inc
Original Assignee
CBS Inc
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 CBS Inc filed Critical CBS Inc
Publication of GB2015294A publication Critical patent/GB2015294A/en
Application granted granted Critical
Publication of GB2015294B publication Critical patent/GB2015294B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Landscapes

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

Abstract

A noise-reduced video output signal 22 has contributions both from the incoming video 10 and from stored video 11 representing the video which arrived one frame or field earlier. The relative contributions of the incoming and stored video vary 54 according to the difference 46 between them, i.e. the motion in the picture, provided that the difference exceeds a preset threshold 50 selected to exclude differences due to noise. To prevent chrominance phase noise which exceeds the threshold from being interpreted as motion the chrominance component is removed either from the incoming and stored signals by filtering, 24, 26, 28 and 32, 34, 36, or from the difference signal. If the difference of the incoming and stored video exceeds a higher preset threshold 72, indicating a large degree of motion, the output video 22 consists of the incoming video alone. <IMAGE>
GB7844884A 1978-02-27 1978-11-17 Noise reduction in colour television signals Expired GB2015294B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88128478A 1978-02-27 1978-02-27

Publications (2)

Publication Number Publication Date
GB2015294A true GB2015294A (en) 1979-09-05
GB2015294B GB2015294B (en) 1982-06-23

Family

ID=25378151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7844884A Expired GB2015294B (en) 1978-02-27 1978-11-17 Noise reduction in colour television signals

Country Status (5)

Country Link
JP (1) JPS54115018A (en)
CA (1) CA1106058A (en)
DE (1) DE2845591C2 (en)
FR (1) FR2418594A2 (en)
GB (1) GB2015294B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242705A (en) * 1978-09-21 1980-12-30 Sony Corporation Noise reduction system for video signals
GB2139037A (en) * 1983-03-11 1984-10-31 British Broadcasting Corp Measuring the amount of unsteadiness in video signals derived from cine film
US4680638A (en) * 1982-07-16 1987-07-14 British Broadcasting Corporation Concealment of defects in a video signal
EP0242935A1 (en) * 1986-01-17 1987-10-28 Rca Licensing Corporation Video signal motion detecting apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390894A (en) * 1980-08-20 1983-06-28 U.S. Philips Corporation Noise suppression circuit for a video signal
JPS5914471U (en) * 1982-07-20 1984-01-28 日本ビクター株式会社 Image quality improvement circuit for color video signals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1306178A (en) * 1971-06-24 1973-02-07
US3716667A (en) * 1971-10-26 1973-02-13 Bell Telephone Labor Inc Apparatus for detecting the moving areas in a video signal
US4107736A (en) * 1971-12-20 1978-08-15 Image Transform, Inc. Noise reduction system for video signals
US3875584A (en) * 1973-10-17 1975-04-01 Nasa Television noise reduction device
US4032975A (en) * 1974-02-25 1977-06-28 Mcdonnell Douglas Corporation Detector array gain compensation
US4064530A (en) * 1976-11-10 1977-12-20 Cbs Inc. Noise reduction system for color television

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242705A (en) * 1978-09-21 1980-12-30 Sony Corporation Noise reduction system for video signals
US4680638A (en) * 1982-07-16 1987-07-14 British Broadcasting Corporation Concealment of defects in a video signal
GB2139037A (en) * 1983-03-11 1984-10-31 British Broadcasting Corp Measuring the amount of unsteadiness in video signals derived from cine film
EP0242935A1 (en) * 1986-01-17 1987-10-28 Rca Licensing Corporation Video signal motion detecting apparatus

Also Published As

Publication number Publication date
FR2418594B2 (en) 1985-05-17
GB2015294B (en) 1982-06-23
JPS54115018A (en) 1979-09-07
DE2845591C2 (en) 1982-09-09
CA1106058A (en) 1981-07-28
DE2845591A1 (en) 1979-08-30
FR2418594A2 (en) 1979-09-21

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Legal Events

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