EP0334932A1 - Agencement de circuits de traitement de composants video - Google Patents

Agencement de circuits de traitement de composants video

Info

Publication number
EP0334932A1
EP0334932A1 EP88908859A EP88908859A EP0334932A1 EP 0334932 A1 EP0334932 A1 EP 0334932A1 EP 88908859 A EP88908859 A EP 88908859A EP 88908859 A EP88908859 A EP 88908859A EP 0334932 A1 EP0334932 A1 EP 0334932A1
Authority
EP
European Patent Office
Prior art keywords
chrominance
components
multiplexer
luminance
pct
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
EP88908859A
Other languages
German (de)
English (en)
Inventor
Heinz-Werner Keesen
Laurent Perdrieau
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0334932A1 publication Critical patent/EP0334932A1/fr
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/08—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using sequential signals only
    • 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
    • H04N9/641—Multi-purpose receivers, e.g. for auxiliary information

Definitions

  • the invention relates to a circuit arrangement for processing video components.
  • the CVBS signal is processed digitally.
  • the CVBS signal is digitally processed in an A / D converter, in a digital color decoder the signal * is divided into the components of the Y signal and the components of U and V signals.
  • the signals are transmitted on the same lines at different times by means of a multiplexer at the output. They are then stored in image memories.
  • multiplexers are usually used. When using multiplexers, only one analog / digital conversion is required for all three signals. To do this, however, the analog / digital converter must operate at a high sampling rate in order to achieve the most original possible reproduction image.
  • the output signal of the multiplexer is fed to an analog / digital converter, then the samples are stored and read out at a higher frequency in order to achieve the horizontal compression of the image.
  • For vertical compression one of three or four lines of the incoming video source is analyzed. The reduction ratio is selected depending on the result. If necessary, a vertical filter is also used.
  • the reduced picture is superimposed on the main picture.
  • the invention is based on the object of specifying a circuit for the preparation of a first video image which allows the first video image to be reproduced in a second video image with little effort.
  • the subsampling entails loss of information.
  • these information losses are due to the necessary reduction ratio, which ches, for example, is a quarter of the main image reproduced, tolerable.
  • the luminance and the color difference components can be selected.
  • the two signal components luminance and chrominance
  • both the same horizontal filter structure is used and only one analog / digital converter, each of the video signal components being subjected to undersampling.
  • Fig. 1 shows a circuit arrangement for processing video components by means of a multiplexer arrangement.
  • Fig. 2 is a timing diagram
  • the 2: 1 multiplexer is switched at a frequency FH / 8 which is one eighth of the line frequency, so that after every fourth line the inputs V of the multiplexer 2 are switched of the 2: 1 multiplexer 2 and the output of the low-pass filter 5, to which the luminance signal Y is present, are routed to a 2: 1 multiplexer 3 which is switched with a frequency FV / 2.
  • the frequency FV / 2 corresponds to half
  • the inputs of the multiplexer.3 are thus switched over with every field change.
  • the switching frequencies FH / 8, FV / 2 of the multiplexers 2, 3 are centralized by the synchronous separation circuit and clock e 6 and generated by dividers 7, 8.
  • the output of the multiplexer 3 leads to an - H-
  • FIG. 2a shows the line pulses and FIG. 2b the switching frequency FH / 8 generated from them by the synchronous separation circuit and clock center 6 and the divider 8.
  • 2c shows the image pulses and FIG. 2d the switching frequency FV / 2 generated from them by the synchronous separation circuit and clock center 6 and the divider 7.
  • the half-images are converted from a frame using the multiplexers 2, 3 e.g. processed in such a way that the luminance signal Y is used in the first field and the color difference signals U and V are used in the other field.
  • the luminance signal Y is fed to the digital / analog converter 4 from incoming image signals for the first field.
  • the next field contains only the information of the two color difference signals U or V, the first four continuous lines containing the first color component U of the field and the next four continuous lines containing the second component V. This process is repeated for the entire second field.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)
  • Processing Of Color Television Signals (AREA)
  • Studio Circuits (AREA)
  • Picture Signal Circuits (AREA)
  • Details Of Television Scanning (AREA)
  • Television Systems (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

Un agencement de circuits traite des composants d'une image vidéo destinée à être numériquement reproduite dans une autre image vidéo, l'image à réduire étant numérisée et reproduite sous une forme réduite à l'intérieur de l'image originelle. Une fréquence élevée de multiplexage est requise afin d'obtenir une largeur de bande correcte pour chaque composant vidéo. Afin de rendre superflue une fréquence élevée de multiplexage, les signaux vidéo d'entrée de l'image à reproduire dans l'image originelle sont sous-analysés. L'invention a des applications dans des appareils de reproduction vidéo.
EP88908859A 1987-09-30 1988-09-27 Agencement de circuits de traitement de composants video Pending EP0334932A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733004 1987-09-30
DE3733004 1987-09-30

Publications (1)

Publication Number Publication Date
EP0334932A1 true EP0334932A1 (fr) 1989-10-04

Family

ID=6337270

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88115853A Expired - Lifetime EP0309976B1 (fr) 1987-09-30 1988-09-27 Agencement de circuit pour le traitement de composantes vidéo
EP88908859A Pending EP0334932A1 (fr) 1987-09-30 1988-09-27 Agencement de circuits de traitement de composants video

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88115853A Expired - Lifetime EP0309976B1 (fr) 1987-09-30 1988-09-27 Agencement de circuit pour le traitement de composantes vidéo

Country Status (10)

Country Link
US (1) US4942457A (fr)
EP (2) EP0309976B1 (fr)
JP (1) JP2783364B2 (fr)
KR (1) KR0124469B1 (fr)
AT (1) ATE83114T1 (fr)
DE (1) DE3876358D1 (fr)
ES (1) ES2036647T3 (fr)
GR (1) GR3007206T3 (fr)
SG (1) SG32093G (fr)
WO (1) WO1989003155A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2664779B1 (fr) * 1990-07-13 1993-06-11 Europ Rech Electr Lab Procede de traitement d'un signal video.
DE4028424A1 (de) * 1990-09-07 1992-03-12 Philips Patentverwaltung Schaltungsanordnung zur a/d-umsetzung der farbinformationen zweier bildsignale
US5821919A (en) * 1994-04-29 1998-10-13 Intel Corporation Apparatus for table-driven conversion of pixels from YVU to RGB format
US6323913B1 (en) * 1997-01-10 2001-11-27 Infineon Technologies Ag Circuit configuration for color decoding and decimation for a video signal
US6868124B2 (en) * 2001-06-18 2005-03-15 Webtv Networks Inc. (Microsoft) Method and systems for compressing a video stream with minimal loss after subsampled decoding
TW200917855A (en) * 2007-10-05 2009-04-16 Novatek Microelectronics Corp Video controller and method for processing video signal

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2644706C3 (de) * 1976-10-04 1985-12-05 Robert Bosch Gmbh, 7000 Stuttgart System zur Übertragung bzw. Speicherung eines Farbfernsehsignals
DE3020920A1 (de) * 1980-06-03 1981-12-10 Robert Bosch Gmbh, 7000 Stuttgart System zur speicherung von bildsignalen
JPS5985196A (ja) * 1982-11-06 1984-05-17 Victor Co Of Japan Ltd カラ−映像信号のデイジタル処理装置
NL194023C (nl) * 1983-05-06 2001-04-03 Philips Electronics Nv Kleurentelevisie transmissie- respectievelijk informatieopslagsysteem met tijdmultiplexcodering en daartoe geschikte informatiegever en -ontvanger.
US4821086A (en) * 1987-10-28 1989-04-11 Rca Licensing Corporation TV receiver having in-memory switching signal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8903155A1 *

Also Published As

Publication number Publication date
KR0124469B1 (en) 1997-12-01
GR3007206T3 (fr) 1993-07-30
EP0309976B1 (fr) 1992-12-02
EP0309976A1 (fr) 1989-04-05
ATE83114T1 (de) 1992-12-15
US4942457A (en) 1990-07-17
JPH02501524A (ja) 1990-05-24
DE3876358D1 (de) 1993-01-14
WO1989003155A1 (fr) 1989-04-06
KR890702376A (ko) 1989-12-23
ES2036647T3 (es) 1993-06-01
SG32093G (en) 1993-07-09
JP2783364B2 (ja) 1998-08-06

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Legal Events

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Free format text: VERFAHREN ABGESCHLOSSEN INFOLGE VERBINDUNG MIT 88115853.9/0309976 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) VOM 06.08.91.