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Hologram-based watermarking capable of surviving print-scan process
Shuozhong Wang1, Sujuan Huang, Xinpeng Zhang
1School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China. shuowang@shu.edu.cn
Applied Optics
|March 4, 2010
Summary
This study introduces a novel hologram-based watermarking technique for digital images. This computer-generated holography method ensures robust protection for both electronic and printed photographs against various manipulations and attacks.
Area of Science:
- Digital image processing
- Computer-generated holography
- Information security
Background:
- Digital image copyright protection is crucial.
- Existing watermarking schemes face limitations against postprocessing and printing-scanning attacks.
Purpose of the Study:
- To develop a robust digital image watermarking scheme.
- To protect copyright of both electronic and hardcopy images.
Main Methods:
- A computer-generated hologram of the watermark is created using conjugate-symmetric extension.
- The hologram's spectrum is embedded into the discrete cosine transform (DCT) domain of the image.
- Watermark transparency and robustness are balanced by adjusting its placement.
Main Results:
- The hologram-based watermark demonstrates robustness against common digital image manipulations like contrast enhancement, smoothing, sharpening, and geometric transformations.
- The scheme is particularly effective against anticropping and interference.
- Crucially, the watermarking withstands printing-scanning attacks.
Conclusions:
- The proposed hologram-based watermarking scheme offers superior robustness for digital image copyright protection.
- It effectively safeguards images in both digital and physical formats.
- This technique provides a viable solution for protecting photographic works.
