Reliefs

Complex decorative reliefs are often added to CAD models in such application areas as sign-making, packaging, and ceramics to make product designs more interesting, more characteristic of the company, or of higher intrinsic value.

New reliefs can be created from 2D artwork using software such as Delcam’s ArtCAM, or can be hand-crafted, typically on a planar surface, and reverse engineered using a 3D scanner. Unfortunately, extraction of the relief from the scan of a physical part is only possible when the relief is lying on a planar surface. As in general such reliefs lie on freeform surfaces, reverse engineering methods are needed to separate the relief from the non-planar background, and to assist in the application of the relief to a different base surface.

This project aims to device mathematical methods and algorithms for the reverse engineering and reapplication of reliefs. The work concerns separating scan points belonging to the relief from the background, identifying single units of repeating relief patterns, fitting the background surface and flatting the relief’s underlying surface.

Project web site


      Publications

      • J. Wu, R. R. Martin, P. L. Rosin, X-F. Sun, F. C. Langbein, Y.-K. Lai, A. D. Marshall, Y.-H. Liu. Making Bas-reliefs from Photographs of Human Faces. Computer Aided Design 45(3):671-682, 2013. [DOI:10.1016/j.cad.2012.11.002] [PDF] [Details]
      • Xianfang Sun, Paul L. Rosin, Ralph R. Martin, Frank C. Langbein. Bas-Relief Generation Using Adaptive Histogram Equalisation. IEEE Trans. Visualization and Computer Graphics, 15(4):642-653,2009. [DOI:10.1109/TVCG.2009.21] [PDF] [Details]
      • S. Liu, R. R. Martin, F. C. Langbein, P. L. Rosin. Segmenting Periodic Reliefs on Triangle Meshes. In: R. R. Martin, M. A. Sabin, J. J. Winkler (eds), Maths of Surfaces XII, Springer LNCS, 4647:290-306, 2007. [DOI: 10.1007/978-3-540-73843-5_18] [PDF] [Details]
      • S.-L. Liu, R. R. Martin, F. C. Langbein, P. L. Rosin. Segmenting Geometric Reliefs from Textured Background Surfaces. Computer-Aided Design and Applications, 4(5):565-583, 2007. [DOI:10.1080/16864360.2007.10738492] [Published] [PDF] [Details]
      • S. Liu, R. R. Martin, F. C. Langbein, P. L. Rosin. Background Surface Estimation for Reverse Engineering of Reliefs. Int. J. CAD/CAM, 7(4), 2007. [Published] [PDF] [Details]
      • S. Liu, R. R. Martin, F. C. Langbein, P. L. Rosin. Segmenting Reliefs on Triangle Meshes. In: Proc. ACM Symp. Solid and Physical Modeling, pp. 7-16, 2006. [DOI:10.1145/1128888.1128890] [PDF] [Details]

              Partners

              • Shenglan Liu
                School of Computer Science and Informatics, Cardiff University, UK.

              • Delcam Inc PLC
                Birmingham, UK.

              • Paul Rosin
                School of Computer Science and Informatics, Cardiff University, UK.

              • A Dave Marshall
                School of Computer Science and Informatics, Cardiff University, UK.

              • Ralph R Martin
                School of Computer Science and Informatics, Cardiff University, Cardiff, UK.

              • Frank C Langbein
                School of Computer Science, Cardiff University, Cardiff, UK.

              Funding

              • February 2005 - February 2008: Reverse Engineering of Reliefs. EPSRC GR/T24425/01. PI: RR Martin, CoI: AD Marshall, FC Langbein, PL Rosin. Industrial partner: Delcam Int PLC. £200,425. [Details]