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Yanghai Tsin
PhD Student

No longer a member of RI.

For more information, see my personal homepage.

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I am interested in automatically extracting statistical invariants from visual signals. These invariants can be physically meaningful, such as reflectance, illuminant spectra, 3D relative positions and camera parameters; and they can be transformed version of such physically meaningful invariants. The extracted, or learned information will be stored as non-parametric distributions. And they can be integrated into a Bayesian inference framework that can help an intelligent agent to further explore the world. I am working toward developing the algorithms and applying them to typical vision problems such as color constancy, object recognition and structure from motion.

In addition, I am studying texture models and its interaction with lighting effects, such as penumbra and shadows.

3-D perception, computer vision, geometric modeling, graphics, machine learning, object recognition, statistics, stereo vision, and visual tracking

• Computational Symmetry - We are develping techniques for applying computational symmetry (symmetry detection, representation, and reasoning) in computer vision, graphics and robotics.
• Video Surveillance and Monitoring - Coordinated video surveillance system

• A Computational Model for Repeated Pattern Perception using Crystallographic Groups - We are developing a computational model for repeated pattern perception that is able to automatically classify a given pattern into one of the 7 frieze groups, one of the 17 wallpaper groups, or one of the 230 space groups.
• Texture Replacement in Real Images - We are developing methods to replace some specified texture patterns in an image while preserving lighting effects, shadows and occlusions.

• The Promise and Perils of Near-Regular Texture [pre-publication color version]
  Y. Liu, Y. Tsin, and W. Lin
  International Journal of Computer Vision, Vol. 62, No. 1-2, April, 2005, pp. 145 - 159. [Abstract]
  Download: pdf [3392 KB], ps.gz [10214 KB] copyrighted

• The Promise and Perils of Near-Regular Texture [publication grayscale version]
  Y. Liu, Y. Tsin, and W. Lin
  International Journal of Computer Vision, Vol. 62, No. 1-2, April, 2005, pp. 145 - 159. [Abstract]
  Download: pdf [2207 KB] copyrighted

• A Computational Model for Periodic Pattern Perception Based on Frieze and Wallpaper Groups
  Y. Liu, R. Collins, and Y. Tsin
  IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 26, No. 3, March, 2004, pp. 354 - 371. [Abstract]
  Download: pdf [3541 KB] copyrighted

• Kernel Correlation as an Affinity Measure in Point-Sampled Vision Problems
  Y. Tsin
  doctoral dissertation, tech. report CMU-RI-TR-03-36, Robotics Institute, Carnegie Mellon University, September, 2003. [Abstract]
  Download: pdf [8789 KB] copyrighted

• Stereo Matching with Reflections and Translucency
  Y. Tsin, S. Kang, and R. Szeliski
  IEEE Computer Vision and Pattern Recognition (CVPR'03), June, 2003. [Abstract]
  Download: pdf [2704 KB] copyrighted

• Gait Sequence Analysis using Frieze Patterns
  Y. Liu, R. Collins, and Y. Tsin
  Proceedings of the 7th European Conference on Computer Vision (ECCV'02), May, 2002. [Abstract]
  Download: pdf [973 KB], ps.gz [567 KB] copyrighted

• The Promise and Perils of Near-Regular Texture
  Y. Liu and Y. Tsin
  Texture 2002, the 2nd International Workshop on Texture Analysis and Synthesis, associated with the European Conference on Computer Vision 2002 (ECCV'02), 2002. [Abstract]
  Download: pdf [1341 KB], ps.gz [2617 KB] copyrighted

• Bayesian Color Constancy for Outdoor Object Recognition
  Y. Tsin, R. Collins, V. Ramesh, and T. Kanade
  IEEE Conference on Computer Vision and Pattern Recognition (CVPR'01), December, 2001. [Abstract]
  Download: pdf [418 KB] copyrighted

• Gait Sequence Analysis using Frieze Patterns
  Y. Liu, R. Collins, and Y. Tsin
  tech. report CMU-RI-TR-01-38, Robotics Institute, Carnegie Mellon University, December, 2001. [Abstract]
  Download: pdf [1073 KB], ps.gz [659 KB] copyrighted

• Texture Replacement in Real Images
  Y. Tsin, Y. Liu, and V. Ramesh
  IEEE Conference on Computer Vision and Pattern Recognition, Vol. 2, December, 2001, pp. 539 = 544. [Abstract]
  Download: pdf [731 KB], ps.gz [7075 KB] copyrighted