Image analysis – Image compression or coding
Patent
1995-05-08
1998-05-05
Boudreau, Leo
Image analysis
Image compression or coding
283 77, 283113, 283901, 380 4, 380 51, 380 55, G06T 900
Patent
active
057487839
ABSTRACT:
A digital signal is imperceptibly embedded into an input source signal, such as an image or video signal, to produce an encoded (sometimes termed "watermarked") signal. The principle of quasi-rotational symmetry is employed to facilitate detection of the embedded signal notwithstanding rotation of the encoded signal. Single or multiple degrees of symmetry can be employed. In another aspect, the digital signal is transformed to a frequency domain and phase-only filtered prior to its combination with the input source signal. In an illustrative embodiment, this filtering operation helps hide the digital signal within the source signal, and facilitates detection of the embedded digital signal even after the encoded signal has undergone various forms of corruption.
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Koch et al
Boudreau Leo
Digimarc Corporation
Werner Brian P.
LandOfFree
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