Robust watermarking method by systematic block diffusion using discrete cosine transform

Kazuo Ohzeki, Kazutaka Bannai, Yuan Yu Wei, Yutaka Hirakawa, Kiyotsugu Sato

Research output: Contribution to conferencePaperpeer-review


Digital watermarks have long been considered as a security feature. A watermarking method that involves the diffusion of limited watermark information into a large part of an image's data has high robustness. The diffused information is summed up to a single component before detecting the watermark. The summing up process eliminates small noises by an averaging effect, which improves the robustness of the embedded watermark against attack. In this field, thus far, only an asymmetrical Chirp transformation with a small block size has been attempted. In this study, a new verification experiment for a large block size of 256 × 256 pixels is conducted. High robustness of the proposed method is revealed. This includes the finding that, in the case of a JPEG compression attack, the proposed system is robust even at strong compression of 1/70. As for a clipping attack, embedded watermarks can be detected with up to seven-pixel clipping of an embedded image.

Original languageEnglish
Number of pages10
Publication statusPublished - 2014
Event11th Australian Digital Forensics Conference, ADF 2013 - Perth, Australia
Duration: 2013 Dec 22013 Dec 4


Conference11th Australian Digital Forensics Conference, ADF 2013


  • Clipping
  • DCT
  • Diffusion
  • Digital watermarking
  • Shrink
  • Systematic block diffusion

ASJC Scopus subject areas

  • Information Systems


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