Video scrambling

Details Video scrambling Video scrambling

1995-08-31

1998-09-29

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 14, 380 17, 380 49, H04N 7167

Patent

active

058155724

ABSTRACT:
A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention changes the combination of modes used as time progresses. In addition, particular modes can be implemented, or suppressed, in response to such factors as (i) noise in the transmission channel and (ii) amount of motion within the video image.

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patent: 4827510 (1989-05-01), Walker et al.
patent: 4916737 (1990-04-01), Chomet et al.
patent: 4964162 (1990-10-01), McAdam et al.
patent: 5185794 (1993-02-01), Thompson et al.
patent: 5268961 (1993-12-01), Ng
patent: 5321748 (1994-06-01), Zeidler et al.

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