School of Mechanical and Production Engineering 

YT0313.jpgLee Yong Tsui
Associate Professor
BSc (Leeds, 1977), MS (Rochester, 1980), PhD (Leeds, 1983)
Assistant Chair (Students)
Director, MSc in Manufacturing Systems and Engineering Program
Chair, SIGGRAPH Asia Conference Advisory Group

Tel: 67905493


Academic History & Professional Experience 

In the 1980s, worked in software development in CAD and solid modelling for 7.5 years at PAFEC Ltd. in Nottingham, UK.

Joined NTU in January 1991.

Chairman of the inaugural SIGGRAPH Asia conference in December 2008, here in Singapore. Great conference; loads of good contents, some 3400 attendees. Tough job, but great experience and thoroughly enjoyed it. There has since been one event every year: Yokohama 2009, Seoul 2010, Hong Kong 2011, Singapore 2012, Hong Kong 2013. In 2014, Shenzhen, China.

Now the Chair of the SIGGRAPH Asia Conference Advisory Group.

Research Interests

Computer in engineering in general. Particularly geometric modelling, computer graphics, CAD/CAM and their applications. Current pet topic is on 3D shape recovery from line drawings and sketches. We are now able to recover objects accurately from accurate line drawings. We are now extending it to recover objects in photographs.

One object we wish to recover is human, with the ultimate aim of recreating 3D human motion from a video sequence. Plenty of interesting research problems and issues there.


Like sports, keen squash player. But a torn Achilles tendon on the squash court in 2004 put paid to that. Now playing a modified form of squash – your ball must not die before the middle service line or else I win the point. This means we play only at the back of the court – save my knees and ankles. But surprisingly it is still a very good and energetic form of squash, as you now have to drive the ball and a rally lasts much longer on average.

Die hard Leeds United supporter. Have had little to cheer in the last 10 years. Promotion to the Championship in 2010 … well … nothing since.

Nature buff.

Recent Publications

F Fang and YT Lee, “Efficient decomposition of line drawings of connected manifolds without face identification”, Computer-Aided Design, DOI information: 10.1016/j.cad.2014.02.002, 2014.

MC Leong, YT Lee and F Fang, “A Search-and-Validate Method for Face Identification from Single Line Drawings”, IEEE Transaction on Pattern Analysis and Machine Intelligence, Volume 35, Number 11, pp2576-2591, November 2013.

YT Lee and F Fang, “A new hybrid method for 3D object recovery from 2D drawings and its validation against the cubic corner method and the optimisation-based method”, Computer-Aided Design, Volume 44, Number 11, pp 10901102, November 2012.

Y Liu and YT Lee, “Optimization-based Freeform Shape Reconstruction”, 3D Research, Volume 3, Number 3, 2012.

F Fang and YT Lee, “3D Reconstruction of Polyhedral Objects from Single Perspective Projections Using Cubic Corner”, 3D Research, Volume 3, pp 1-8, 2012.

YT Lee and F Fang, “3D Reconstruction of Polyhedral Objects from Single Parallel Projections Using Cubic Corner”, Computer-aided Design, Volume 43, Number. 8, pp1025-1034, 2011.

YQ Guan, YY Cai, YT Lee and M Opas. “An Automatic Method for Identifying Appropriate Gradient Magnitude for 3D Boundary Detection of Confocal Image Stacks”. Journal of Microscopy, Volume 223, pp 66-72, 2006.

Y Sun and YT Lee, “Regularity Selection for Effective 3D Object Reconstruction from a Single Line Drawing”, Pattern Recognition Letters, Volume 29, Issue 10, pp 1486-1495, July 2008.

HL Zou and YT Lee, “Constraint-Based Beautification and Dimensioning Of 3D Polyhedral Models Reconstructed from 2D Sketches”, Computer-aided Design, Volume 39, Number 11, pp 1025-1036, November 2007.

HL Zou and YT Lee, “Skewed Rotational Symmetry Detection from a 2D Line Drawing of a 3D Polyhedral Object”, Computer-Aided Design, Volume 38, Number 12, pp1224-1232 Dec 2006.

HL Zou and YT Lee, “Detecting Minimum Over-constrained Sub-graphs in 2D and 3D based on Degree of Freedom Analysis”, Computer-aided Design and Applications, Volume 2, Number1-4, pp 393-402, 2005.

JZ Liu, YT Lee and WK Cham, “Identifying Faces in a 2D Line Drawing Representing a Manifold Object”, IEEE Transaction on Pattern Analysis and Machine Intelligence, Volume 24, Number 12, pp 1579-1593, December 2002.

JZ Liu and YT Lee, “A Graph-based method for Face Identification from a Single 2D Line Drawing”, IEEE Transaction on Pattern Analysis and Machine Intelligence, Volume 23, Number 10, Oct 2001, pp1089-1106.

YT Lee and L Fang, “Accurate Modelling of Complex Functional Surfaces for Mechanical Design using Freeform Surfaces”, Journal of Mechanical Design, USA, Volume 122, Number 2, June 2000, pp 236-239.