Da-Wen Xu

Tongji University, Shanghai, Shanghai Shi, China

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Publications (4)0 Total impact

  • Da-Wen Xu · Rang-ding Wang · Ji-cheng Wang
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    ABSTRACT: As H.264/AVC digital video becomes more prevalent, issues of copyright protection and authentication that appropriate for this standard become very important. In this paper, an authentication watermarking algorithm for H.264/AVC compressed video by modulating CAVLC code words of 4×4 luminance blocks is proposed. During the embedding process, the eligible code words are first identified, and then the modulating rules between these code words and the watermark bits are established. The watermark information can be extracted directly from the encoded stream without resorting to the original video, and merely requires decoding the CAVLC code from bit stream rather than decoding the whole video. Experimental results show that the proposed watermarking scheme can effectively embed watermark information with little bit rate increase and almost no quality degradation.
    No preview · Conference Paper · Jun 2010
  • Da-wen Xu · Rang-ding Wang · Ji-cheng Wang
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    ABSTRACT: An effective watermarking algorithm using Zernike moments and image normalization is proposed to resist object manipulations. Rotation invariance is achieved by taking the magnitude of the Zernike moments. Image normalization method is used for scale and translation invariance. Watermark signal can be inserted into the Zernike moments of cover image, but the reconstruction procedure is computationally expensive and there is severe fidelity loss. Zero-watermarking technique can solve these problems successfully. Experimental results show that the scheme is robust to compression, filtering, Gaussian noise as well as geometrical attacks including rotation, scaling.
    No preview · Conference Paper · Jul 2008
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    Da-Wen Xu
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    ABSTRACT: A blind video watermarking algorithm based on 3D wavelet transform is proposed in this paper. The original video frames are divided into 3D-blocks. According to HVS properties, the motive block with complex texture is selected to embed the watermark. The CDMA encoded watermark is embedded into the wavelet coefficients of the selected sub-block. Blind recovery of the embedded data is achieved using the auto-correlation of the orthogonal codes. Experimental results show the watermarked frames are indistinguishable from the original frames subjectively and the proposed video watermarking algorithm is robust against the attacks of additive Gaussian noise, frame dropping, frame averaging and lossy compression.
    Preview · Conference Paper · Jan 2008
  • Rang-Ding Wang · Da-Wen Xu · Qian Li
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    ABSTRACT: An audio watermarking scheme, which embedded robust and fragile watermark at the same time in lifting wavelet domain is presented. Robust watermark is embedded in the low frequency range using mean quantization. It has great robustness and imperceptibility. Fragile watermark is embedded in the high frequency range by quantizing single coefficient. When the audio signal is tampered, the watermark information will change synchronously. So it can be used for audio content integrity verification. The watermark can be extracted without the original digital audio signal. Experimental results show that robust watermark is robust to many attacks, such as mp3 compression, low pass filtering, noise addition, requantization, resampling and so on. Fragile watermark is very sensitive to these attacks.
    No preview · Conference Paper · Sep 2005

Publication Stats

23 Citations

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  • 2008-2010
    • Tongji University
      • Department of Computer Science and Technology
      Shanghai, Shanghai Shi, China
  • 2005-2008
    • Ningbo University
      Ning-po, Zhejiang Sheng, China