Method and device for processing a sequence of video images

Details Method and device for processing a sequence of video images Method and device for processing a sequence of video images

2007-01-25

2010-10-26

Barron, Jr., Gilberto (Department: 2432)

Cryptography

Video cryptography

Video electric signal modification

C380S054000

Reexamination Certificate

active

07822202

ABSTRACT:
The invention discloses a new modulation scheme to prevent illegal copy in movie theaters. None of the existing modulation schemes make the right assumptions to modelize a camcorder device. In such classical schemes, camcorders are always considered as sampling devices without taking into account the effects of shutter speed. The shutter of the camcorder is classically compared to a low-pass filter. As a result, modulation effects can be easily removed by setting up shutter speed to low values (low cutoff frequency). The right mathematical modelization of the shutter effect shows that, in the spectral domain, the behavior of the camcorder is close to a cardinal sine function with a main lobe and sidelobes. Consequently, according to the invention, it is proposed to select a modulation frequency that not only generates visual artifacts once recorded by the camcorder under shutter-free conditions, but that can also generate artifacts despite low shutter speed settings by going through sidelobe of the shutter spectrum.

REFERENCES:
patent: 2002/0083324 (2002-06-01), Hirai
patent: 2002/0097328 (2002-07-01), Henderson et al.
patent: 2002/0168069 (2002-11-01), Tehranchi et al.
patent: 2004/0218761 (2004-11-01), Gustafson
patent: 1237369 (2002-09-01), None
patent: 1345428 (2003-09-01), None
patent: WO0133846 (2001-05-01), None
Search Report dated Aug. 7, 2006.

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