Semi-fragile watermarking based on dither modulation

Authors:
Jongweon Kim;Youngbae Byun;Jonguk Choi
Affiliations:
College of Computer Software and Media Technology, Sangmyung University, Seoul, Korea;MarkAny Inc., Seoul, Korea;College of Computer Software and Media Technology, Sangmyung University, Seoul, Korea
Venue:
PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
Year:
2004

Citing 2
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Image forensics technology for digital camera

PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
Quantization index modulation: a class of provably good methods for digital watermarking and information embedding

IEEE Transactions on Information Theory

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Abstract

In this paper, a semi-fragile watermarking algorithm is proposed to prevent images from being altered, based on dither modulation and linearity of discrete cosine transform (DCT). As the algorithm transforms DCT coefficients in spatial domain using dither modulation and the linearity of DCT, it embeds watermarking information very fast without DCT. The robustness of the pro-posed algorithm against compression proved in a serious of experiments. Furthermore, because a semi-fragile watermark can be embedded into DCT coefficients with only additions and subtractions, watermarking information can be embedded fast with simple computations. As a result, semi-fragile watermark-ing information can be added in a real time to prevent forgeries and alteration in portable devices with limited resources such as digital cameras, digital camcorders and cellular phones.