H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33
H04N 1/41 (2006.01) H04N 1/411 (2006.01)
Patent
CA 1191940
PROGRESSIVE TRANSMISSION OF TWO-TONE FACSIMILE Abstract of the Disclosure A method and apparatus is disclosed for the transmission of two tone pictures progressively in several stages. Progressive transmission enables a viewer to receive and utilize pictures in a small fraction of the normal transmission time. In a first stage, information representing groups of picture elements of preselected lines of the scanned picture is transmitted which allows a coarse version of the picture to be reproduced at a receiver. During the subsequent stages the horizontal resolution of the previously transmitted scan lines is improved and additional scan lines are transmitted in a specific order until the received picture is an identical copy of the original picture. The progressive picture information is efficiently transmitted in one of several line-by-line codes resulting in a total transmission time not significantly longer than the time for a nonprogressive transmission.
402652
Johnsen Ottar
Netravali Arun N.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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