Method for the estimation and recovering of general affine...

Details Method for the estimation and recovering of general affine... Method for the estimation and recovering of general affine...

2005-06-07

2005-06-07

Patel, Kanjibhai (Department: 2625)

Cryptography

Key management

Having particular key generator

C382S248000, C382S250000, C382S276000, C348S380000, C708S400000, C708S402000

Reexamination Certificate

active

06904151

ABSTRACT:
The present invention relates to the methods of estimation and recovering of general affine geometrical transformations which were applied to data, extensible to any other defined class of geometrical transformations, according to the preamble of the dependent claims. The parameters of the undergone deformation are robustly estimated based on maxima given by a parametric transform such as Hough transform or Radon transform of some embedded information with periodical or any other known regular structure. The main applications of this invention are robust digital still image/video watermarking, document authentication, and detection of periodical or hidden patterns. In the case of periodical watermarks, the watermark can also be predistorted before embedding based on a key to defeat block-by-block removal attack.

REFERENCES:
patent: 6385329 (2002-05-01), Sharma et al.
patent: 6408082 (2002-06-01), Rhoads et al.
patent: 6483927 (2002-11-01), Brunk et al.
patent: 6580809 (2003-06-01), Stach et al.

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