A discrete wavelet transform based robust watermarking for copyright protection

Authors:
Wen-Tzeng Huang;Sun-Yen Tan;Yuan-Jen Chang;Chin-Hsing Chen
Affiliations:
Department of Computer Science and Information Engineering, Mingsin University of Science and Technology, Xinfeng, Hsinchu, Taiwan, R.O.C.;Department of Electronic Engineering, National Taipei University of Technology, Taipei, Taiwan, R.O.C.;Department of Management Information Systems, Central Taiwan University of Science and Technology, Taichung City, Taiwan, R.O.C.;Department of Management Information Systems, Central Taiwan University of Science and Technology, Taichung City, Taiwan, R.O.C.
Venue:
ICNVS'10 Proceedings of the 12th international conference on Networking, VLSI and signal processing
Year:
2010

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Abstract

Digital watermarking is a simple and effective way to provide copyright protection. This paper proposes a robust and blind watermarking scheme for static images. It utilizes discrete wavelet transform and applies three coding methods according to the different characteristics of band coefficients: lattice code based on the communication principle, modification of insignificant coefficients based on the just-noticeable distortion of the human visual model, and quantization index modulation based on singular value decomposition. Together, these methods embed a watermark while maintaining image fidelity. The experimental results prove that the proposed method is robust against frequency-based and time domain geometric attacks.