Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-11-02
1985-08-06
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358106, 377 24, H04N 702, H04N 962
Patent
active
045339449
ABSTRACT:
A video processing system especially for use with microprocessors or microcomputers characterized by limited memory storage capacity and processing capability. The video processing system includes a TRANSITION DETECTOR for detecting BLACK-TO-WHITE and WHITE-TO-BLACK transitions in a video signal, from whatever source. The output of the TRANSITION DETECTOR is coupled to a FEATURE COUNTER so that the FEATURE COUNTER provides at a computer buss an output indicative of the number of such transitions occurring during a particular horizontal scanning period. An output of the FEATURE COUNTER drives a DECODER that selectively enables a plurality of FEATURE TIMERS, each of which has an input coupled to a CLOCK so that the FEATURE TIMERS provide an output indicative of the time duration between successive transitions in the video signal. The video processing system thereby makes available to the microcomputer the number and respective durations of transitions during a horizontal scanning period. At the end of each horizontal line, this data is transferred via the computer buss into memory and the FEATURE COUNTER and FEATURE TIMERS are reset in preparation for the subsequent line. This cycle is repeated until an entire video frame has been encoded and transferred to the microcomputer for processing as desired.
REFERENCES:
patent: 3584143 (1971-06-01), Gold
patent: 3763357 (1973-10-01), Morton
patent: 3963866 (1976-06-01), Tanie
Eby John E.
Kingston Charles M.
Chin Tommy P.
GTE Products Corporation
McNeill William H.
Odozynski John A.
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