Yale   Computer Graphics
                                                  
       
               
           

Xuejin Chen (陈雪锦)                 

 

Postdoctoral Associate

 

51 Prospect St. AKW 510, New Haven, CT 06511, United States

 

Email: xuejin DOT chen AT yale DOT edu

Office Tel: (+1) 203-432-1228

 

 Resume         Research         Publications

 

Research Interests

   - sketch based modeling  
   
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Education

I obtained Ph.D. and B.S in Department of Electronic Science and Technology in University of Science and Technology of China (USTC) in 2008 and 2003. My Ph.D. supervisor is Prof. Heung-Yeung Shum. I had been taking internship in Visual Computing Group in Microsoft Research Asia (MSRA) since July 2004 to 2008. My mentors were Dr. Ying-Qing Xu and Sing Bing Kang. Now I am working with Prof. Julie Dorsey on sketching related projects.
     
    Research Projects
    Sketch-Based Tree Modeling Using Markov Random Field [Paper][Video(divx)]

In this paper, we presented an easy-to-use system for converting a 2D free-hand sketch of a tree to full 3D model that is both complex and realistic-looking. Our system does this by probabilistic optimization based on parameters obtained from a database of tree models. Branch interaction is modeled by a Markov random field, subject to the constraint of 3D projection to sketch. Our system then uses the notion of self-similarity to add new branches before finally populating all branches with leaves of the user's choice. A variety of natural-looking tree models can be generated from freehand sketches with only a few strokes.
           
            Sketch-Based Tree Modeling Using Markov Random Field [Paper][Video(divx)]
We presented a novel flexible system of converting the user’s freehand sketching to realistic rendering for complicated architecture design. The primitive geometries, detailed geometries and textures are interpreted from freehand sketches. Our system allows the user to easily draw sketch, modify the geometry model, texture and view the realistic rendering of the complex architecture models
            Retargeting Vector Animation for Small Displays[Paper]
I proposed the algorithm of retargeting vector animation when it is resized, especially for small displays. The recognizability of the interaction between key objects is preserved by analyzing the perceptual complexity of objects. My work includes implementing the parser of XML file, designing and implementing the object simplification and exaggeration based on perceptual complexity.
            Poisson Video Editing
I implemented the video editing algorithm by solving Poisson equation based on incomplete Cholesky conjugate gradient method for large sparse matrix. Different guide vector fields from the gradient of the source and target video are computed to produce different mergence effects of the videos.
            Publications
  • Xuejin Chen, Boris Nerburt, Ying-Qing Xu, Oliver Deussen, Sing Bing Kang, Sketch-based tree modeling using Markov random field, ACM Siggraph Asia and Transaction on Graphics, Vol. 27, No. 5, 2008 [PDF]
  • Xuejin Chen, Sing Bing Kang, Ying-Qing Xu, Julie Dorsey, Heung-Yeung Shum, Sketching Reality: realistic interpretation of architectural design, ACM Transaction on Graphics,Vol. 27, No. 2, April 2008. [PDF].
  • Vidya Stelur, Xuejin Chen, Ying-Qing Xu, Bruce Gooch, Retargeting vector animation for small displays, Proceedings of the 4th international conference on Mobile and Ubituitous Multimedia, ACM Press, 2005, Vol. 154, pages 69-77. [PDF]