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DING Wei, YAN Weiqi, QI Dongxu. Digital Image Watermarking Based on Discrete Wavelet Transform. Journal of Computer Science and Technology, 2002, 17(2).
Citation: DING Wei, YAN Weiqi, QI Dongxu. Digital Image Watermarking Based on Discrete Wavelet Transform. Journal of Computer Science and Technology, 2002, 17(2).

Digital Image Watermarking Based on Discrete Wavelet Transform

  • This paper aims at digital watermarkwhich is a new popular research topic recently, presents some methods toembed digital watermark based on modifying frequency coefficients indiscrete wavelet transform (DWT) domain. First, the present progress ofdigital watermark is briefly introduced; after that, starting from Pitas'smethod and discarding his pseudo random number method, the authors use adigital image scrambling technology as preprocessing for digitalwatermarking. Then the authors discuss how to embed a 1-bit digitalimage as watermark in frequency domain. Finally another digitalwatermarking method is given in which 3-D DWT is used to transform agiven digital image. Based on the experimental results, it is shown thatthe proposed methods are robust to a large extent.
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