Acta Optica Sinica, Volume. 31, Issue 2, 207002(2011)
Fourier Computer-Generated Hologram Digital Watermarking with Nonlinear Amplitude Limiting
A new approach of Fourier computer-generated hologram (CGH) digital watermarking with nonlinear amplitude limiting is proposed,which realizes better robustness. The amplitude and phase are extracted on the basis of traditional Fourier transform holography. Binary Fourier hologram is formed by nonlinear amplitude limiting algorithm when the phase information as input function and the amplitude information transferred into a bias function, because the binary hologram has stronger anti-interference property than the normal hologram, and the digital watermarking of much better robustness can be obtained. To improve the watermark′s resistance to compression, hologram is embedded in the frequency domain through discrete cosine transform. Theoretical analysis and numerical experiments show that the algorithm has more robustness to image lossy compression, cropping and filter, compared with the algorithm based on traditional Fourier CGH watermarking.
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Chen Daqing, Zhou Hao, Tao Zhi, Gu Jihua. Fourier Computer-Generated Hologram Digital Watermarking with Nonlinear Amplitude Limiting[J]. Acta Optica Sinica, 2011, 31(2): 207002
Category: Fourier optics and signal processing
Received: May. 17, 2010
Accepted: --
Published Online: Jan. 30, 2011
The Author Email: Daqing Chen (chendq@suda.edu.cn)