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Image Adaptive Block DCT-Based Perceptual Digital Watermarking  

최윤희 (광주과학기술원 기전공학과)
최태선 (광주과학기술원 기전공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.41, no.6, 2004 , pp. 221-229 More about this Journal
Abstract
We present new digital watermarking scheme that embeds a watermark according to the characteristics of the image or video. The scheme is compatible with established image compression standard. We define a weighting function using a parent-child structure of the DCT coefficients in a block to embed a maximum watermark. The spatio-frequency localization of the DCT coefficients can be achieved with this structure. In the detection stage, we present an optimum a posteriori threshold with a given false detection error probability based on the statistical analysis. Simulation results show that the proposed algorithm is efficient and robust against various signal processing techniques. Especially, they are robust against widely used coding standards, such as JPEG and MPEG.
Keywords
digital watermarking; block DCT; a posteriori threshold;
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