A new watermarking method with obfuscated quasi-chirp transform

Kazuo Ohzeki, Yuanyu Wei, Yutaka Hirakawa, Kiyotsugu Sato

研究成果: Conference contribution

1 被引用数 (Scopus)


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.

ホスト出版物のタイトルDigital-Forensics and Watermarking - 10th International Workshop, IWDW 2011, Revised Selected Papers
出版ステータスPublished - 2012
イベント10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011 - Atlantic City, NJ, United States
継続期間: 2011 10月 232011 10月 26


名前Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
7128 LNCS


Conference10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011
国/地域United States
CityAtlantic City, NJ

ASJC Scopus subject areas

  • 理論的コンピュータサイエンス
  • コンピュータ サイエンス(全般)


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