发明申请
- 专利标题: Discrete fourier transform (DFT) watermark
- 专利标题(中): 离散傅里叶变换(DFT)水印
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申请号: US10635347申请日: 2003-08-06
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公开(公告)号: US20050036613A1公开(公告)日: 2005-02-17
- 发明人: Wensheng Zhou , Hua Xie
- 申请人: Wensheng Zhou , Hua Xie
- 专利权人: THE BOEING COMPANY
- 当前专利权人: THE BOEING COMPANY
- 主分类号: G06T1/00
- IPC分类号: G06T1/00 ; H04N1/32 ; H04N7/16 ; H04N7/167 ; H04N7/173
摘要:
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.
公开/授权文献
- US07376241B2 Discrete fourier transform (DFT) watermark 公开/授权日:2008-05-20
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