Wavelet tree quantization for copyright protection watermarking.
This paper proposes a wavelet-tree-based blind watermarking scheme for copyright protection. The wavelet coefficients of the host image are grouped into so-called super trees. The watermark is embedded by quantizing super trees. The trees are so quantized that they exhibit a large enough statistical difference, which will later be used for watermark extraction. Each watermark bit is embedded in perceptually important frequency bands, which renders the mark more resistant to frequency based attacks. Also, the watermark is spread throughout large spatial regions. This yields more robustness against time domain geometric attacks. Examples of various attacks will be given to demonstrate the robustness of the proposed technique.
Wang
Shih-Hao
SH
Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC. shwang.ee90g@nctu.edu.tw
Lin
Yuan-Pei
YP
D000465:Algorithms; D016494:Computer Security; D044962:Data Compression / Q000379:methods* / Q000592:standards; D019146:Hypermedia; D007089:Image Enhancement / Q000379:methods* / Q000592:standards; D007090:Image Interpretation, Computer-Assisted / Q000379:methods* / Q000592:standards; D010330:Patents as Topic; D010363:Pattern Recognition, Automated; D011356:Product Labeling / Q000379:methods* / Q000592:standards; D011786:Quality Control; D012815:Signal Processing, Computer-Assisted