A new watermarking method with obfuscated quasi-chirp transform

Kazuo Ohzeki; Yuanyu Wei; Yutaka Hirakawa; Kiyotsugu Sato

doi:10.1007/978-3-642-32205-1_7

A new watermarking method with obfuscated quasi-chirp transform

Kazuo Ohzeki, Yuanyu Wei, Yutaka Hirakawa, Kiyotsugu Sato

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

Watermark detection software is obfuscated using a table to hide embedding and detection algorithms. As the table size is limited, the block size is also limited for watermarking. To address this situation, a new quasi-chirp transform is developed to improve embedding efficiency. The quasi-chirp transform is different from the conventional DCT or Fourier transform. It contains multiple frequency components in a single basis of the transform. It disperses image data rather than compressing it, as the DCT does. The dispersed data increases the range for embedding watermarks. The chirp transform is able to embed even on a flat area of an image. Using this chirp transform, embedding and detection experiments for image data with small block sizes were carried out. A high SNR and robust watermark with an evaluated obfuscation were obtained.

Original language	English
Title of host publication	Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers
Pages	57-71
Number of pages	15
DOIs	https://doi.org/10.1007/978-3-642-32205-1_7
Publication status	Published - 2012
Event	10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011 - Atlantic City, NJ, United States Duration: 2011 Oct 23 → 2011 Oct 26

Publication series

Name	Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume	7128 LNCS
ISSN (Print)	0302-9743
ISSN (Electronic)	1611-3349

Conference

Conference	10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011
Country/Territory	United States
City	Atlantic City, NJ
Period	11/10/23 → 11/10/26

Keywords

detection
embedding
obfuscation
orthogonal transform
quantization

ASJC Scopus subject areas

Theoretical Computer Science
Computer Science(all)

Access to Document

10.1007/978-3-642-32205-1_7

Cite this

Ohzeki, K., Wei, Y., Hirakawa, Y., & Sato, K. (2012). A new watermarking method with obfuscated quasi-chirp transform. In Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers (pp. 57-71). (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 7128 LNCS). https://doi.org/10.1007/978-3-642-32205-1_7

A new watermarking method with obfuscated quasi-chirp transform. / Ohzeki, Kazuo; Wei, Yuanyu; Hirakawa, Yutaka et al.

Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers. 2012. p. 57-71 (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 7128 LNCS).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ohzeki, K, Wei, Y, Hirakawa, Y & Sato, K 2012, A new watermarking method with obfuscated quasi-chirp transform. in Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), vol. 7128 LNCS, pp. 57-71, 10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011, Atlantic City, NJ, United States, 11/10/23. https://doi.org/10.1007/978-3-642-32205-1_7

Ohzeki K, Wei Y, Hirakawa Y, Sato K. A new watermarking method with obfuscated quasi-chirp transform. In Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers. 2012. p. 57-71. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)). doi: 10.1007/978-3-642-32205-1_7

Ohzeki, Kazuo ; Wei, Yuanyu ; Hirakawa, Yutaka et al. / A new watermarking method with obfuscated quasi-chirp transform. Digital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers. 2012. pp. 57-71 (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)).

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AB - Watermark detection software is obfuscated using a table to hide embedding and detection algorithms. As the table size is limited, the block size is also limited for watermarking. To address this situation, a new quasi-chirp transform is developed to improve embedding efficiency. The quasi-chirp transform is different from the conventional DCT or Fourier transform. It contains multiple frequency components in a single basis of the transform. It disperses image data rather than compressing it, as the DCT does. The dispersed data increases the range for embedding watermarks. The chirp transform is able to embed even on a flat area of an image. Using this chirp transform, embedding and detection experiments for image data with small block sizes were carried out. A high SNR and robust watermark with an evaluated obfuscation were obtained.

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A new watermarking method with obfuscated quasi-chirp transform

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