Method and system for anti-piracy using frame rate dithering

Details Method and system for anti-piracy using frame rate dithering Method and system for anti-piracy using frame rate dithering

1995-08-04

1997-10-21

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 9, 380 10, 380 20, 380 48, H04L 900, H04N 7167

Patent

active

056804547

ABSTRACT:
A method and system of displaying an image sequence containing a plurality of image frames to inhibit an unauthorized duplication thereof by a camera. The method includes steps of generating a pseudo-random noise sequence, and displaying the image sequence at a frame rate which is varied for successive pairs of the image frames in dependence upon the pseudo-random noise sequence. The frame rate is varied within a predetermined range about a nominal frame rate for the image sequence such that the variations are imperceptible by a human observer. The system includes a pseudo-random sequence generator (30) which generates the pseudo-random noise sequence, and a display device (36) to display the image sequence at a frame rate which is varied in dependence upon the pseudo-random noise sequence.

REFERENCES:
patent: 3958077 (1976-05-01), Ross et al.
E. Kranakis, Primality and Cryptography; (John Wiley & Sons; New York; 1986; Section 4.1, pp. 98-99).

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