Image analysis – Applications
Reexamination Certificate
2000-03-08
2002-03-05
Johns, Andrew W. (Department: 2621)
Image analysis
Applications
C380S252000
Reexamination Certificate
active
06353672
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to audio and video signal processing, and more particularly relates to the processing of such signals to embed auxiliary data (e.g. identification or control data therein), and the subsequent extraction and use of such data.
SUMMARY OF THE INVENTION
In accordance with an illustrative embodiment of the present invention, an input content signal-representing audio or video—is steganographically encoded to hide plural-bit auxiliary data therein. The encoding operation changes over time, e.g., by using different “key” data for successive portions of the content signal. In some embodiments, the key data used in one portion of the signal is a function of auxiliary data decoded from a preceding portion. Consequently, to successfully decode the auxiliary data, the decoder must have successfully decoded a previous portion. In essence, decoding instructions are sent “on the fly” in such embodiments.
In some embodiments, the auxiliary data is changed in temporally adjoining portions of the content signal—e.g., in successive frames of video or blocks of audio. In other embodiments, the key is changed less frequently, e.g., on a daily basis. External events may also trigger changing of the key data.
The foregoing and additional features and advantages of the present invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
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van Schyndel et al., “A Digital Watermark,”IEEE Proc. Int. Conf. on Image Processing, Nov. 1994, pp. 86-90.
Conwal William Y
Digimarc Corporation
Johns Andrew W.
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