Image signal scrambling apparatus and descrambling apparatus

Details Image signal scrambling apparatus and descrambling apparatus Image signal scrambling apparatus and descrambling apparatus

1994-11-30

1996-12-10

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 49, H04N 7167

Patent

active

055839380

ABSTRACT:
An object of the invention is to provide an image scrambling apparatus and an image descrambling apparatus capable of making a communication of secrecy by scrambling a digital image signal as well as variable-length-encoding the digital image signal.
A transmitting apparatus 1 DCT-encodes an image signal V2 from an A/D converter 11 by means of a DCT encoder 12, and outputs signals of D1, D2, D3, D4, and the number of zero-runs D5. When it variable-length-encodes the D2 to D5 through a variable-length encoder 13 and outputs V3, it generates a series of PN signals K2 by means of a PN generator 18 on the basis of a PN initial value K1 from a PN initial value generator 17, adds the scalar quantumizing number D1 and K2 to each other by means of an adder 19 and outputs the scrambled D1, and then gives a scrambled image signal V4 through compositing the V3 and the D1.

REFERENCES:
patent: 5208857 (1993-05-01), Lebrat
patent: 5377266 (1994-12-01), Katta et al.
patent: 5515395 (1996-05-01), Tsutsui
patent: 5515437 (1996-05-01), Katta et al.
patent: 5521978 (1996-05-01), Oguro

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