NDLI: Dual Watermarking Scheme via Sub-Sampling in WPT-SVD Domain

Content Provider	IEEE Xplore Digital Library
Author	Bhatnagar, G. Raman, B.
Copyright Year	2008
Description	Author affiliation: Dept. of Math., Indian Inst. of Technol. Roorkee, Roorkee (Bhatnagar, G.; Raman, B.)
Abstract	In this paper, a dual watermarking scheme based on wavelet packet transform(WPT), singular value decomposition (SVD) and sub-sampling is presented. After dividing original image into four sub-sample images, two sub-images are selected by taking into consideration of block variance singular analysis (BVSA). Then two watermarks are embedded in the selected subimages. First watermark is embedded into one of the selected sub-image by modifying the singular values. For second watermark embedding, another sub-image is transformed into wavelet packet transform domain and embedding is again done by modifying the singular values of the selected sub-bands. After embedding, modified sub-bands are mapped to their original positions for constructing watermarked sub-image. After both embedding, watermarked image is constructed by inverse sub-sampling. Experimental results show good robustness and security of the proposed scheme. A new measure BVSA is presented, which gives an image block from a set of image blocks, whose mean, standard deviation, entropy, gradient and sum of singular values is greater.
Starting Page	850
Ending Page	855
File Size	1266791
Page Count	6
File Format	PDF
ISBN	9780769532677
DOI	10.1109/ICETET.2008.112
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-16
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wavelet transforms Watermarking Transforms Wavelet analysis Wavelet packets Robustness Discrete wavelet transforms
Content Type	Text
Resource Type	Article

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