Improvement of watermark detection ability based on blockwise image compensation for geometrical distortions

Ryuji Hisanaga, Minoru Kuribayashi, Hatsukazu Tanaka

Research output: Contribution to journalArticle

3 Citations (Scopus)


One of the important problems of watermarking techniques is the weakness against geometrical distortions because of synchronization loss. In this paper, we propose an image compensation scheme against geometrical distortions in order to extract watermarks correctly. Our scheme collects the feature points in an image so as to recover the distortions caused by geometrical distortion attacks. Such feature points are selected by the local maximal value of partitioned regions which can be obtained by several filtering operations. Based on the computer simulated results, we have searched the optimal filtering operation and interpolation, and then studied the validity of our scheme.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalElectronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number12
Publication statusPublished - Dec 1 2006
Externally publishedYes



  • Affine transformations
  • Feature points
  • Geometrical distortions
  • Image compensation
  • Watermarking

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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