Method for transmitting pictures at a picture telephone transmis

Details Method for transmitting pictures at a picture telephone transmis Method for transmitting pictures at a picture telephone transmis

1974-12-06

1976-08-24

Britton, Howard W.

Telegraphy

Systems

Simplex-reversing periodic

178DIG3, 179 2TV, 340324AD, H04N 712

Patent

active

039768317

ABSTRACT:
The present invention relates to a method for transmitting stationary pictures via a picture telephone transmission having limited bandwidth. Both fields of the picture are in the transmitter side divided into a number of line groups. In the first field, certain picture elements in one group are sampled and stored in a buffer memory in the transmitter and the rest of the line groups in the field are scanned without the sampling of further elements. After that, the second field is scanned in similar manner. The transmission of the stored values of the sampled elements are transmitted with a rate determined by the bandwidth of the transmission media and during the time when the rest of the line groups in the field are scanned.

REFERENCES:
patent: 3663749 (1972-05-01), Cannon
patent: 3822363 (1974-07-01), Moyer

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