標題: Wavelet tree group modulation (WTGM) for digital image watermarking
作者: Tsai, Min-Jen
Shen, Chang-Hsing
資訊管理與財務金融系 註:原資管所+財金所
Department of Information Management and Finance
關鍵字: quantization;copyright protection;wavelet
公開日期: 2007
摘要: Differential Energy Watermarking (DEW) based techniques have been applied in DEW, modified schemes of DEW or Wavelet Tree Quantization (WTQ) algorithms by differentiating the transformed coefficient energy to verify the watermark embedding for copyright protection and ownership verification. In this paper, we present a novel differential energy watermarking algorithm based on the wavelet tree group modulation (WTGM) structure. The wavelet coefficients of the image are divided into disjoint tree groups and each tree group contains two sub tree groups. The watermark is embedded in the tree components using the group strategy such that the energy of tree groups is close and each subgroup performs different modulation for watermark embedding. Therefore, the employment of wavelet tree structure, sum-of-subsets and positive/negative modulation effectively improve the watermark robustness. In addition, the contrast sensitive function (CSF) and noise visibility function (NVF) of human visual system are also considered for the better visual quality of the watermarked image. The experimental results demonstrate the effectiveness of WTGM algorithm in terms of robustness and imperceptibility of watermarking.
URI: http://hdl.handle.net/11536/11146
ISSN: 1520-6149
期刊: 2007 IEEE International Conference on Acoustics, Speech, and Signal Processing, Vol II, Pts 1-3
起始頁: 173
結束頁: 176
顯示於類別:會議論文