Image encoding method, image decoding method and image signal re

Details Image encoding method, image decoding method and image signal re Image encoding method, image decoding method and image signal re

1997-06-23

2000-12-12

Swann, Todd

Cryptography

Video cryptography

Video electric signal modification

380212, H04L 900

Patent

active

061608890

ABSTRACT:
Scrambling is performed without deteriorating the quality of an image encoded by an MPEG method and in which the MPEG standard is used as it is. When a digital image signal formed of a luminance signal and color-difference signals is formed into an encoded signal by an MPEG encoding method, this signal is scrambled by giving a predetermined phase angle to the color-difference signals, the scrambled image signal is MPEG-encoded, a signal for identifying the phase angle is generated, and the at least MPEG-encoded image signal and the signal for identifying the phase angle are multiplexed and output. Thus, scrambling can be performed without changing the MPEG method.

REFERENCES:
patent: 5060262 (1991-10-01), Bevins, Jr. et al.
patent: 5627892 (1997-05-01), Kauffman
patent: 5848154 (1998-12-01), Nishio et al.

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