System for encoding or decoding analog video signals

Details System for encoding or decoding analog video signals System for encoding or decoding analog video signals

1988-07-28

1990-04-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

3582611, H04N 141

Patent

active

049185403

ABSTRACT:
An encoder/decoder for video signals is especially designed for truer conversion of half-tone signals. An image scanner produces analog signals which are converted to digital signals and buffer stored for eliminating timing differences. Then, the signals are preprocessed to increase the run-length of the digital video signals. The signals are monitored both before and after the preprocessing. A comparison of these monitored signals leads to a selection of the one signal before or after preprocessing which appears to be the best. That selected signal has a tag inserted to demark it from the next succeeding signal and to indicate whether the preprocessing was or was not included in the transmitted signal. The tag signal is used to include or exclude a post processing in order to undo the encoding.

REFERENCES:
patent: 4110795 (1978-08-01), Spencer
patent: 4353096 (1982-10-01), Sakurai
patent: 4782400 (1988-11-01), Ohtani

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