Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-07-31
1987-12-01
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
353 85, 353105, H04N 712
Patent
active
047108134
ABSTRACT:
A low bandwidth video teleconferencing system and method is disclosed. The video teleconferencing system employs novel data compression techniques by which continuous transmission of imagery at a rate of 9600 bits/second is possible. A sketch coder converts the grey scale image to be transmitted to a sketch or line drawing, which comprises an outline of the principal boundaries plus shading to represent depth. The bandwidth required for the data representing the sketch is then compressed by two-dimensional run length coding techniques which exploit interframe and interline redundancy as well as intraline redundancy to generate a binary transmission code. Other features are also provided.
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Pratt William K.
Wallis Robert H.
Coles Sr. Edward L.
Compression Labs, Inc.
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