Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-06-28
1985-01-15
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, 358 85, 179 2TV, 382 9, H04H 712
Patent
active
044941447
ABSTRACT:
A bandwidth reduced teleconferencing system achieving good video presence. The bandwidth reduction is accomplished by dividing the video picture of the camera into segments, by determining the activity level within each segment and by transmitting the signal of each segment with a resolution level which is related to the activity level within the segment. The most active segment is transmitted at highest resolution while other segments are transmitted at lower resolutions.
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Higginbotham, A. L., et al., Teleconference Systems, IBM Tech. Disclosure Bulletin, vol. 22, No. 9, 2-80, (Ch) 179-2TV.
Seyler, A. J., "The APO TV-Conferencing Facility", 1973, TJA, vol. 23, No. 3, pp. 216-225.
van Buul, M. C. W., et al., "Standards Conversion of a TV Signal with 625 Lines into a Videophone Signal with 313 Lines", 1973, Philips Research Report 28, pp. 377-390.
AT&T Bell Laboratories
Brendzel H. T.
Britton Howard W.
Coles Edward L.
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