Hua Xie Phones & Addresses
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Rosemead, CA
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San Gabriel, CA
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El Monte, CA
Business Records
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Phones & Addresses
ZX INTERNATIONAL LLC
HWAYEE INTERNATIONAL LTD
Publications
Us Patents
Discrete Fourier Transform (Dft) Watermark
View pageUS Patent:
7376241, May 20, 2008
Filed:
Aug 6, 2003
Appl. No.:
10/635347
Inventors:
Wensheng Zhou - Los Angeles CA, US
Hua Xie - Alhambra CA, US
Hua Xie - Alhambra CA, US
Assignee:
The Boeing Company - Chicago IL
International Classification:
G06K 9/00
US Classification:
382100
Abstract:
A Discrete Fourier Transform watermark for use with digital images/video. A Y component of a Y, U(Cb), V(Cr) digital data stream representing color components of digital video is extracted as the digital data for embedding the watermark. The digital data is then scaled to a standard size. A Discrete Fourier Transform (DFT) is performed on the digital data, and a magnitude domain of the Discrete Fourier Transform is computed. The watermark is embedded into selected frequency bands of the computed magnitude domain of the Discrete Fourier Transform, thereby creating a watermarked magnitude domain. The selected frequency bands comprise one or more middle frequency bands, and the middle frequency bands comprise a band of circular rings of the magnitude domain. An inverse Discrete Fourier Transform is performed on the watermarked magnitude domain to reconstruct the digital data with the embedded watermark.