Watermarking Method Using PN Diffusion and 1D-Fourier Transform of Multi-Resolution Approximation for Image

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  • 多重解像度近似にPN拡散と1次元フーリエ変換を用いた画像電子透かし埋め込み法
  • タジュウ カイゾウド キンジ ニ PN カクサン ト 1ジゲン フーリエ ヘンカン オ モチイタ ガゾウ デンシ スカシ ウメ コミ ホウ

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Abstract

In this paper, we propose image digital watermark method which has robustness against image compression and clipping. In this method, we first at first take discrete wavelet transform of original image, and get out multi-resolution approximation (MRA). Next, we spread spectrum of the MRA by Pseudo Noise (PN) sequence, and then take 1D-discrete Fourier transform (DFT) of each column. We vary the DFT coefficients according to each bit of watermark information. This method has the features which the third eavesdropper, who don't know the PN sequence, can not decipher the information data and alter them. In detection process, we take the DFT difference between PT-spread MRA of original image and that of watermark-embedded image and calculate shift of the DFT coefficients. Therefore, this method has the advantage that we can detect the watermark information even from the clipping image.

Journal

  • ITE Technical Report

    ITE Technical Report 25.83 (0), 49-54, 2001

    The Institute of Image Information and Television Engineers

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