Parity-grid steganographic method and apparatus

Details Parity-grid steganographic method and apparatus Parity-grid steganographic method and apparatus

2005-03-01

2005-03-01

Chang, Jon (Department: 2623)

Image analysis

Applications

Reexamination Certificate

active

06862362

ABSTRACT:
A method and apparatus for generating a parity grid matrix from an indexed data representation are disclosed. The method includes the steps of calculating a parity value for each of specified rows and columns of the indexed representation, determining a parity restoration value for each of the specified rows and columns that exhibit a non-zero parity value, and adding the parity restoration values to one or more selected elements of the specified rows and columns that exhibit a non-zero parity value. A method and apparatus for embedding and retrieving information in/from data representations such as images, by use of a parity grid matrix, are also disclosed.

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Wu et al. “Image Refining Technique Using Digital Watermarking.” IEEE Trans. on Consumer Electronics, vol. 46, no. 1, Feb. 2000, pp. 1-5.*
Lee et al. “A Watermarking Sequence Using Parities of Error Control Coding for Image Authentication and Correction.” IEEE Trans. on Consumer Electronics, vol. 46, no.2, May 2000, pp. 313-317.

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