EP 1002426 A1 20000524 - 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
Application
Priority
- DE 19733761 A 19970805
- EP 9804825 W 19980803
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
IPC 8 full level
H04N 1/64 (2006.01); H04N 7/24 (2006.01); H04N 7/26 (2006.01); H04N 19/00 (2014.01)
CPC (source: EP)
H04N 1/646 (2013.01); H04N 19/00 (2013.01); H04N 21/2383 (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
DOCDB simple family (publication)
DE 19733761 A1 19990211; DE 19733761 C2 20010726; AU 9158198 A 19990301; EP 1002426 A1 20000524; WO 9908445 A1 19990218
DOCDB simple family (application)
DE 19733761 A 19970805; AU 9158198 A 19980803; EP 9804825 W 19980803; EP 98943823 A 19980803