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2000 Fiscal Year Final Research Report Summary

A study on the Digital Watermarking and Copyright Protection Method for 3D Geometric Models

Research Project

Project/Area Number 11650113
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機械工作・生産工学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

KANAI Satoshi  Hokkaido Univ., Grad. School of Eng., Asso. Prof., 大学院・工学研究科, 助教授 (90194878)

Co-Investigator(Kenkyū-buntansha) KISHINAMI Takeshi  Hokkaido Univ., Grad. School of Eng., Prof., 大学院・工学研究科, 教授 (30001796)
Project Period (FY) 1999 – 2000
KeywordsDIGITAL WATERMARKING / CAD / GEOMETRIC MODEL / INFORMATION SEQUIRITY / POLYGONAL MODEL / COMPUTER GRAPHICS / WAVELET TRANSFORM
Research Abstract

The purpose of this research is to develop the new digital watermarking methods for 3D geometric models in the area of CAD, CAM, CAE and CG.Watermarking is one of the copyright protection methods where an invisible watermark is secretly embedded into the original data. The proposed watermarking method is based on wavelet transform and multi-resolution representation of the 3D geometric models.
In this research, large-scale polygon, solid and surface models were firstly designed using commercial 3-D CAD systems. Then the series of operations consisting watermark embedding on these models, coordinate transformation and modification of models, and watermark extraction were executed in order to evaluate the performance of proposed watermarking method.
The robustness of the watermark for external attacks, capacity of embeddable watermark and the geometric error caused by watermark embedding were evaluated quantitatively. The following results were obtained ;
(1) The embedded watermarks were completely kept under the affine transformation.
(2) The geometric error of the models caused by the embedding could be easily kept within the specified tolerances.
(3) The embedded watermarks were robust to the several attacks such as noise superposition and vertex modification on the models.
(4) The embedded watermarks were not robust to the cropping operation for the models.
Furthermore, the developed watermarking method was improved so as to be applied to the watermarking for 2D vector data such as digital map. As a result of the experiment, it was verified that the visual quality of the data could be kept, the capacity of the watermark was large enough to store the copyright data, and the watermark was very robust to the noise superposition on the vertex coordinates.
In the future, the modification of the algorithm will be necessary so that the embedded watermark becomes more robust to the cropping operation for the 2-D or 3-D geometric models.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 伊達宏昭: "ウエーブレット変換に基づく3次元ポリゴンモデルへの「電子透かし」埋め込み"精密工学会誌. 65巻・9号. 1275-1279 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Satoshi KANAI: "Digital Watermarking for 3D Polygons using Multiresolution Wavelet Decomposition"Proceedings of 6^<th> IFIP Workshop on Geometric Modeling. 296-307 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroaki Date: "Digital Watermarking for 3D Polygonal Model based on Wavelet Transform"ASME Proceedings of Design Engineering Technical Conferences. DETC/CIE(CDROM). CIE-9031 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 北村伊久裕: "ウエーブレット変換に基づくベクトル型地図データへの電子透かし手法"2000年度地理情報システム学会講演論文集. 9巻. 417-421 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 北村伊久裕: "離散フーリエ変換に基づくベクトル型データへの電子透かし手法"情報処理学会 第62回全国大会講演論文集. (CDROM). 1R-1 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroaki DATE et al: "Digital Watermarking for 3D Polygons based on Wavelet Transform"Journal of JSPE. Vol.65, No.9. 1275-1279 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Satoshi KANAI et al: "Digital Watermarking for 3D Polygons using Multiresolution Wavelet Decomposition"Proceedings of 6^<th> IFIP Workshop on Geometric Modeling. 296-307 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroaki DATE et al: "Digital Watermarking for 3D Polygonal Model based on Wavelet Transform"ASME Proceedings of Design Engineering Technical Conferences. DETC/CIE 9031, (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikuhiro KITAMURA et al: "Digital Watermarking method for Vector Map based on Wavelet Transform"Papers and Proceedings of the Geographic Information Systems Association. Vol.9. 417-421 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikuhiro KITAMURA et al: "Digital Watermarking method for Vector Data based on Discrete Fourier Transform"Proceedings of IPSJ 62 Annual Conferences. 1R-1 (CD-ROM). (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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