Global patent index - EP 1002426 A1

EP 1002426 A1 2000-05-24 - DEVICE FOR TRANSMITTING COLOUR VIDEO STILL IMAGES OVER A LOW BANDWIDTH SIGNAL CHANNEL

Title (en)

DEVICE FOR TRANSMITTING COLOUR VIDEO STILL IMAGES OVER A LOW BANDWIDTH SIGNAL CHANNEL

Title (de)

VORRICHTUNG ZUM ÜBERTRAGEN FARBIGER VIDEO-STANDBILDER ÜBER EINEN SIGNALKANAL GERINGER BANDBREITE

Title (fr)

DISPOSITIF DE TRANSMISSION D'IMAGES FIXES VIDEO EN COULEURS PAR UN CANAL DE SIGNALISATION A FAIBLE LARGEUR DE BANDE

Publication

EP 1002426 A1 (DE)

Application

EP 98943823 A

Priority

  • DE 19733761 A
  • EP 9804825 W

Abstract (en)

[origin: DE19733761A1] The invention relates to a device for transmitting colour still images with a complex colour image signal of any colour television standard over a signal channel which has a low bandwidth in relation to the colour image signal. In particular, any generally available telephone channel can be used for transmission. A video camera for example serves as an image signal source at the transmission end whilst a conventional television receiver is used to reproduce the images at the other end. The invention is based on the lengthening of the image signal of selected individual video images in terms of time. A complex colour image signal in the form of a sequence of pixels converted into binary values serves as an input signal, said complex colour image signal representing a single whole or half-image. According to the invention, said binary values are converted into an analog signal element before transmission. This signal element alternately represents a pulse length or an interpulse period. The successive signal elements form a rectangular wave. Each signal element contains at least two intervals: one interval is dependent on the binary value, the duration of said interval corresponding with said binary value; and one interval is of constant duration.

IPC 1-7 (main, further and additional classification)

H04N 7/14; H04N 1/64

IPC 8 full level (invention and additional information)

H04N 1/64 (2006.01); H04N 7/24 (2011.01); H04N 7/26 (2006.01); H04N 19/00 (2014.01)

CPC (invention and additional information)

H04N 21/2383 (2013.01); H04N 1/646 (2013.01); H04N 19/00 (2013.01); H04N 21/4382 (2013.01)

Citation (search report)

See references of WO 9908445A1

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE

EPO simple patent family

DE 19733761 A1 19990211; DE 19733761 C2 20010726; AU 9158198 A 19990301; EP 1002426 A1 20000524; WO 9908445 A1 19990218

INPADOC legal status

2001-11-28 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20011016

2000-05-24 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000127

2000-05-24 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE