Dual purpose FWT domain spread spectrum image watermarking in real time
Computers and Electrical Engineering
Digital Watermarking Schemes Using Multi-resolution Curvelet and HVS Model
IWDW '09 Proceedings of the 8th International Workshop on Digital Watermarking
CGIM '07 Proceedings of the Ninth IASTED International Conference on Computer Graphics and Imaging
Perceptually adaptive spread transform image watermarking scheme using Hadamard transform
Information Sciences: an International Journal
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The paper presents a robust digital image watermarking scheme that uses both the characteristics of the human visual system (HVS) and statistical information measure. Spread transform approach is used where data is embedded through transform coefficients of both the cover and the watermark data. The spread transform watermarking technique yields better results in terms of imperceptibility, resiliency, capacity and cost compared to widely used spread spectrum watermarking schemes. Hadamard transformation is used not only for simpler implementation but also for its higher data hiding capacity [Capacity estimates for data hiding in compressed images]. Experimental results show that the visual quality of the extracted watermark is good in spite of several external attacks. The fact is also supported by mutual information values used as objective measure.