Wavelet-domain digital watermarking techniques with gray-scale logo image

2001 ◽  
Author(s):  
Kwok Hang Leung
Keyword(s):  
Digital Watermarking ◽  
Wavelet Domain ◽  
Gray Scale

Digital Watermarking of High Security Based on Holography

2013 ◽  
Vol 333-335 ◽  
pp. 1051-1055
Author(s):  
Chao Han ◽  
Meng Meng Li ◽  
Wei Wu
Keyword(s):  
Wavelet Transform ◽  
White Noise ◽  
Digital Watermarking ◽  
Reference Beam ◽  
Shear Resistance ◽  
Wavelet Domain ◽  
Phase Information ◽  
Excellent Performance ◽  
Host Image ◽  
High Security

Aiming at the problem that security of digital watermarking is imperfect, a new digital watermarking algorithm based on holography is put forward. In embedment watermarking stage, first, original watermarking information is divided into two parts: amplitude and phase information. Then, a hologram which will be used as new watermarking information is generated by interference of the phase information light and the reference beam, and the amplitude information will be the key when original watermarking is extracted. At last, host image is transformed by the multilevel structures wavelet transform, and the new watermarking information is embedded into its suitable wavelet domain. In extraction watermarking information stage, the original watermarking information is obtained by the extracted watermarking information combined with the amplitude information. The theory and simulation show our algorithm has excellent performance in security, shear resistance and anti interference of white noise.

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