Electronic information embedding method and extracting...

Details Electronic information embedding method and extracting... Electronic information embedding method and extracting...

2008-05-06

2008-05-06

Moise, Emmanuel L. (Department: 2137)

Information security

Prevention of unauthorized use of data including prevention...

C380S252000, C713S176000

Reexamination Certificate

active

07370363

ABSTRACT:
On embedding electronic watermark data in point group data obtained from a three-dimensional measurement, an x-y plane region defining the point group data is divided into a plurality of small regions so that a point group is produced with respect to each of small regions. The coordinate values of each point group are offset with making a barycenter of the point group be an origin point. A discrete Fourier transform is carried out in order to produce a Fourier coefficient sequence, which is modified into a watermarked Fourier coefficient sequence. The inverse discrete Fourier transform is carried out on the watermarked coefficient sequence in order to produce a watermarked complex number sequence. An optimum watermark embedding strength is calculated. On the basis of the embedding strength, the Fourier coefficient sequence is modified to produce a watermarked Fourier coefficient sequence which is is inversely offset into the watermarked point group data.

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V. Solachidis, N. Nikolaidis and I. Pitas□□Fourier Descriptors Watermarking of Vector Graphics Images□□2000, IEEE, pp. 9-12.

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