A Digital Watermarking of 3D Geometric Model STL for Rapid Prototyping System

쾌속조형 시스템을 위한 3차원 기하학적 형상인 STL의 디지털 워터마킹

  • 김기석 (순천향대학교 대학원 전산학과) ;
  • 천인국 (순천향대학교 공과대학 정보기술공학부)
  • Published : 2002.10.01


In this paper, a new watermarking algorithm for STL files which contains 3D geometric information as triangular facets is proposed. STL files are widely used in rapid prototyping industry as a standard interchange format. The proposed algorithm inserts multi-bit watermark information into the surface normal vector and vertex description area of STL file without distorting the original 3D geometric information. According to the watermark bits, the position of normal vector and the direction of vertex sequence are modulated. The proposed algorithm is robust to the attack of changing the order of the triangular meshes. In addition, the invisibility requirement is also satisfied. Experiment results show that the proposed algorithm can encode and decode watermark bits into the various STL files without any distortion of 3D shape.