Dynamic video scrambling

Details Dynamic video scrambling Dynamic video scrambling

1981-11-06

1984-06-12

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358123, 358124, H04N 716

Patent

active

044545436

ABSTRACT:
A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the brightness level during a predetermined time period of the video signal with the brightness level of the video signal over the succeeding predetermined time period. There are means for changing from one scrambling signal to another if the difference between brightness levels in successive predetermined time periods exceeds a given value.

REFERENCES:
patent: 3729576 (1973-04-01), Court
patent: 4024575 (1977-05-01), Harney et al.
patent: 4064536 (1977-12-01), Saeki et al.
patent: 4216500 (1980-08-01), St. Louis
patent: 4308556 (1981-12-01), Osaka
patent: 4340906 (1982-07-01), Toonder et al.

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