中文

Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (3): 281-288.doi: 10.3969/j.issn.0255-8297.2011.03.011

• Signal and Information Processing • Previous Articles     Next Articles

Print-Scan Resilient Watermarking Based on Digital Hologram and Distortion Correction

HUANG Su-juan1;2, WANG Du-yao1;2, REN Yan-li2   


  1. 1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University,
    Shanghai 200072, China
    2. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
  • Received:2010-07-27 Revised:2011-03-02 Online:2011-05-26 Published:2011-05-25

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Abstract:

This paper presents a novel print-scan resilient watermarking algorithm based on digital hologram and correction of distortion. A hologram of the watermark is obtained and embedded into the spectral magnitude of the host image. A PSNR threshold adapted to the texture of the host image is set to adjust the watermark strength. The rotation distortion due to the print-scan process is corrected based on discrete Fourier transform (DFT) and edge detection. The method makes use of the digital hologram characteristics, and is capable of extracting the embedded watermark from a print-scan version reliably. Compared with previous similar schemes, the proposed approach shows advantages in invisibility, robustness and embedding capacity.

Key words:  print-scan resilient, digital hologram, correction of distortion, image watermarking

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