Sibel Tari, Associate Prof. (Email: stari[at]metu[dot]edu[dot]tr) Computer Engineering Department Middle East Technical Univ.			TEACHING (2003-2007) CENG 382 Dynamic Systems with Feedback CENG 483 Introduction to Computer Vision CENG 583 Computational Vision CENG 566 Image Processing (1998-2003) CENG 373 Operational Mathematics ES 303 Statistical Methods (at Dept. Eng. Science) ES 305 Numerical Methods ES 509 PDE's in Comp. Vision and Image Proc.
	SHAPE RESEARCH PROJECTS PUBLICATIONS STUDENTS DEVIN My Son DEGREES BS in Computer Science Enginering, Hacettepe University, 1989 PhD in Computer Vision (Interdisciplinary Degree), Northeastern University, 1997 Advisor: Jayant Shah Docent Degree in Theoretical Foundations of Computer Science, 2000 RESEARCH My research interest is in cognitive and computational aspects of computer vision and image processing, focusing on partial differential equations, variational methods and axis morphology. SHAPE RESEARCH I am currently looking into shape analysis from a spectral (harmonic analysis) point of view. My recent work explores a new insight into curve evolution and PDE based skeletonization from a spectral point of view. Underlying construction is built on the Eigenspace of the Dirichlet Laplacian combined with the machinery of the edge strength function which I developed during my Phd with my advisors Jayant Shah and Homer Pien. We call the new representation Spectral Skeleton. See Link for key results and publications . PROJECTS (2005-2008) Incorporation of Prior and Contextual Information into Computer Vision - TUBITAK Support link (temporarily unavailable) (2008-2010) Analysis of Visual Thinking and Design - TUBITAK Support (joint with Dr. M. Ozkar) link (temporarily unavailable) Older Projects (1994-2003) Connection Between Stochastic and Deterministic Methods for Diffusion Filtering (DAAD support - with Joachim Weickert) Unstructured Mesh Generation Using Local Symmetry Information (METU Research Fund) Fingerprint Analysis (TRW Support PI: Prof. P. Liang of Univ. California) Anatomic Morphometric Segmentation of Brain Images (NIH Support PI: Prof. D. Kennedy of Harvard Medical School) Part of Human Brain Project Theoretical Framework for Sensor Data Fusion (ARPA Support PI: Prof. M. Kokar of Northeastern University) SELECTED SEMINARS Symmetry Detection in Dense Images and Related Variational Problems Algorithmic Mathematics Group at TUM, Aug 2001, Local Symmetries in Arbitrary Dimensions (joint work with J. Shah) MIA Group, Saarland University, Aug 2003 Disconnected Skeletons and Articulation Priors for Generic Shape Recognition Brown University, Nov 2005 Contextual and Top-down Effects in Early Vision Human Vision Seminar, Informatics Institute, METU, March 2007 PUBLICATIONS Pls send an email for a copy of the articles that are not available Computationally Efficient Shape Analysis via Level Sets, (joint with Jayant Shah and Homer Pien), IEEE Proc. Math. Meth. in Biomedical Image Analysis, June 1996 Sample Result preprint Extraction of Shape Skeletons from Grayscale Images, (joint with Jayant Shah and Homer Pien), CVIU, Vol. 66, pp.133-147, 1997 preprint Simultaneous Segmentation of Images and Shapes, (joint with Jayant Shah), Proc. SPIE Vol.3168, pp.88-94, Vision Geometry VI, 1997 Sample Result Local Symmetries in Arbitrary Dimensions, (joint with Jayant Shah), IEEE Proc. Int. Conf. Computer Vision, pp. 1123-1128, 1998 preprint Multiscale Feature Preserving Compression, (joint with Ping Liang), Proc. SPIE Vol.3304, pp.105-109, 1998 Direct Grayscale Ridge Reconstruction in Fingerprint Images, (joint with Carlotta Domeniconi and Ping Liang), IEEE Proc. Int. Conf. Acoustics, Speech and Signal Proc., pp.2941-2944, 1998 Coloring 3D symmetry set: perceptual meaning and significance in 3D, Proc. SPIE Vol.3716, pp.105-109, Visual Information Processing VIII, 1999 An Integrated Approach to Computational Vision: The Edge Strength Function and Nested Symmetries, (invited), Advances in Imaging and Electron Physics, Vol. 111, pp.327-366, 1999 Color Texture Morphology, Proc. IEEE Workshop in Nonlinear Signal Image Processing, pp.872-876, 1999 Nested Local Symmetry Set, (joint with J. Shah), CVIU, Volume 79, pp.267-280, 2000 An Axis Based Representation for Recognition, (joint with Cagri Aslan), IEEE Proc. Int. Conf. Computer Vision, 2005 preprint Edge Strength Functions as Shape Priors in Image Segmentation, (joint with A.Erdem and E.Erdem), Energy Minimization Meth. in Computer Vision, LNCS, Vol.3757, pp.490-502, 2005 Articulation Prior in an Axial Representation, (joint with A.Erdem and E.Erdem), ECCV Workshop on Representation and Use of Prior Knowledge in Vision, to appear in LNCS, 2006 preprint Mumford Shah Regularizer with Spatial Coherence, (joint with E.Erdem and A.Sancar-Yilmaz), Scale Space and Variational Methods, 2007 Minimally Stochastic Schemes for Singular Diffusion Equations, (joint with Bernhard Burgeth and Joachim Weickert), Image Processing and Partial Differential Equations, pp.325-343, 2007 link Disconnected Skeleton: Shape At its Absolute Scale, (joint with C. Aslan, A. Erdem and E. Erdem), to appear, IEEE Transactions PAMI 2008, pdf Articulated Motion Analysis via an Axis Based Representation, (joint with S. Erdem), Proc. SPIE, 2007 Mumford Shah Regularizer with Contextual Feedback, (joint with E. Erdem), to appear JMIV, 2008 pdf Dissimilarity Between Two Skeletal Trees in a Context (joint with E. Baseski and A. Erdem ), to appear Pattern Recognition, 2008pdf STUDENTS Cagri Aslan, 2003-2005 Current Position : Microsoft Corp. Seattle, WA MS Thesis: DISCONNECTED SKELETON, May 2005 pdf thesis Emre Baseski, 2004-2006 Current Position: MMM Institute, Cognitive Vision Group link MS Thesis: CONTEXT SENSITIVE MATCHING OF SKELETAL TREES, June 2006 Aysun Sancar, 2005-2007 MS Thesis: EDGE PRESERVING SMOOTHING WITH DIRECTIONAL CONSISTENCY, May 2007 Sezen Erdem, 2005-2007 MS Thesis: MOTION ANALYSIS VIA AXIS BASED REPRESENTATION, Sep 2007 Ongoing Phd Students Aykut Erdem, 2004- Erkut Erdem, 2004- Hacer Yalim , 2007- MIND: Mathematical Imaging Non-linear Diffusion MIND Group is conducting research in Mathematical Imaging and Nonlinear Diffusion. MIND was initially formed under the Department of Engineering Sciences at Middle East Technical University. After Sibel Tari's move to the Department of Computer Engineering, MIND continued as a group of students conducting MS and PhD studies under her supervision. All members of the group are affiliated with the Image Processing and Pattern Recognition Laboratory. Mind Page is under construction. Pls visit later.