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GB2000937A - Vertical colour boundary crispening circuit for solid state colour television cameras - Google Patents

Vertical colour boundary crispening circuit for solid state colour television cameras

Info

Publication number
GB2000937A
GB2000937A GB7828984A GB7828984A GB2000937A GB 2000937 A GB2000937 A GB 2000937A GB 7828984 A GB7828984 A GB 7828984A GB 7828984 A GB7828984 A GB 7828984A GB 2000937 A GB2000937 A GB 2000937A
Authority
GB
United Kingdom
Prior art keywords
signal
colour
green
solid state
samples
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
GB7828984A
Other versions
GB2000937B (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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Priority claimed from US05/813,377 external-priority patent/US4176373A/en
Priority claimed from US05/840,877 external-priority patent/US4148059A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB2000937A publication Critical patent/GB2000937A/en
Application granted granted Critical
Publication of GB2000937B publication Critical patent/GB2000937B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
    • H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
    • H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
    • H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Color Television Image Signal Generators (AREA)
  • Processing Or Creating Images (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

To correct vertical edge blurring in elemental-area sampling type imagers a signal processor interpolates to define intermediate signal levels between the samples, this being carried out by delaying 42 a colour signal for a sample period, substracting 43 the delayed signal from an undelayed signal for the same colour and then integrating 44 the difference signal. In colour imaging on a single chip the sampling occurs at different times for different colours and the sampling frequency is frequently different for different colours, so that the colour signals exhibit sharp transitions at the boundaries of picture elements. The luminance is most closely represented by the green signal, and two 'slow' green signals Gs1, Gs2 are produced from alternate green samples and averaged 50 and then added 52 to the full green signal GF to enhance high frequency detail YH. <IMAGE>
GB7828984A 1977-07-06 1978-07-06 Video signal processing Expired GB2000937B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/813,377 US4176373A (en) 1977-07-06 1977-07-06 Signal processing for discrete-sample-type-color-video signal
US05/840,877 US4148059A (en) 1976-05-12 1977-10-11 Signal processing for discrete-sample-type-color-video signal

Publications (2)

Publication Number Publication Date
GB2000937A true GB2000937A (en) 1979-01-17
GB2000937B GB2000937B (en) 1982-01-27

Family

ID=27123732

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7828984A Expired GB2000937B (en) 1977-07-06 1978-07-06 Video signal processing

Country Status (3)

Country Link
JP (1) JPS5948596B2 (en)
GB (1) GB2000937B (en)
HK (1) HK41982A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173306A1 (en) * 1984-08-31 1986-03-05 Hitachi, Ltd. Video signal processing circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5862976A (en) * 1981-10-09 1983-04-14 Hitachi Ltd Video signal processing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173306A1 (en) * 1984-08-31 1986-03-05 Hitachi, Ltd. Video signal processing circuit

Also Published As

Publication number Publication date
GB2000937B (en) 1982-01-27
JPS5948596B2 (en) 1984-11-27
JPS5418230A (en) 1979-02-10
HK41982A (en) 1982-10-08

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Legal Events

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