A security of a watermarking for copyright protection using wavelet transform (Japanese)

In: Transactions of the Information Processing Society of Japan   ;  38 ,  12  ;  2640-2647  ;  1997
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Conventional watermarking using wavelet transforms utilizes the frequency information which is given from an orthogonal Haar wavelet filter to the original image. But it may be very weak against a malicious alteration attack because hidden information could be eliminated using a low-pass filter. Therefore, the authors propose a new watermarking system based on experiments. The system has two features. The first is the active utilization of multiresolutional representation with a wavelet transform. The second is embedding watermarking at a lower frequency field.

Table of contents – Volume 38, Issue 12

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Nakajima, K. / Hayakawa, E. / Namiki, M. / Takahashi, N. | 1997
A security of a watermarking for copyright protection using wavelet transform
Sakai, Y. / Ishizuka, H. / Sakurai, K. | 1997
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