Digital image watermarking based on discrete wavelet transform

  • Authors:

  • Ding Wei;Yan Weiqi;Qi Dongxu

  • Affiliations:

  • CAD Laboratory, Institute of Computing Technology, The Chinese Academy of Sciences Beijing 100080, P.R. China;CAD Laboratory, Institute of Computing Technology, The Chinese Academy of Sciences Beijing 100080, P.R. China;CAD Laboratory, Institute of Computing Technology, The Chinese Academy of Sciences Beijing 100080, P.R. China and CAD Research Center, North China University of Technology, Beijing 100041, P.R. Ch ...

  • Venue:
  • Journal of Computer Science and Technology
  • Year:
  • 2002

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Abstract

This paper aims at digital watermark which is a new popular research topic recently, presents some methods to embed digital watermark based on modifying frequency coefficients in discrete wavelet transform (DWT) domain. First, the present progress of digital watermark is briefly introduced; after that, starting from Pitas's method and discarding his pseudo random number method, the authors use a digital image scrambling technology as preprocessing for digital watermarking. Then the authors discuss how to embed a l-bit digital image as watermark in frequency domain. Finally another digital watermarking method is given in which 3-D DWT is used to transform a given digital image. Based on the experimental results, it is shown that the proposed methods are robust to a large extent.