Now showing items 37-56 of 210

    • Deform PF-MT: Particle Filter With Mode Tracker for Tracking Nonaffine Contour Deformations 

      Vaswani, Namrata; Rathi, Yogesh; Yezzi, Anthony; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-04)
      We propose algorithms for tracking the boundary contour of a deforming object from an image sequence, when the nonaffine (local) deformation over consecutive frames is large and there is overlapping clutter, occlusions, ...
    • Degenerations of curves in P³ 

      Tannenbaum, Allen R. (Georgia Institute of TechnologyAmerican Mathematical Society, 1978-01)
      In this paper we prove every connected, reduced curve in P³ of arithmetic genus 0, may be flatly smoothed. Moreover, we give a new example of a reduced singular curve in P³ which cannot be flatly smoothed.
    • Despeckling of Medical Ultrasound Images 

      Michailovich, Oleg V.; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2006-01)
      Speckle noise is an inherent property of medical ultrasound imaging, and it generally tends to reduce the image resolution and contrast, thereby reducing the diagnostic value of this imaging modality. As a result, speckle ...
    • Detection of Polyps via Shape and Appearance Modeling 

      Mendonça, Paulo R. S.; Bhotika, Rahul; Zhao, Fei; Melonakos, John; Sirohey, Saad (Georgia Institute of Technology, 2008-09-06)
      This paper describes a CAD system for the detection of colorectal polyps in CT. It is based on stochastic shape and appearance modeling of structures of the colon and rectum, in contrast to the data-driven approaches more ...
    • A Dorsolateral Prefrontal Cortex Semi-Automatic Segmenter 

      Al-Hakim, Ramsey; Fallon, James; Nain, Delphine; Melonakos, John; Tannenbaum, Allen R. (Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2006-02)
      Structural, functional, and clinical studies in schizophrenia have, for several decades, consistently implicated dysfunction of the prefrontal cortex in the etiology of the disease. Functional and structural imaging studies, ...
    • Dynamic Denoising of Tracking Sequences 

      Michailovich, Oleg V.; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2008-06)
      In this paper, we describe an approach to the problem of simultaneously enhancing image sequences and tracking the objects of interest represented by the latter. The enhancement part of the algorithm is based on Bayesian ...
    • Dynamic Geodesic Snakes for Visual Tracking 

      Niethammer, Marc; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2004)
      Visual tracking using active contours is usually accomplished in a static framework. The active contour tracks the object of interest in a given frame of an image sequence, and then a subsequent prediction step ensures ...
    • Dynamic level sets for visual tracking 

      Niethammer, Marc; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-12)
      In this paper we describe two methods for tracking planar curves which are allowed to change topology. In contrast to previous approaches a level set formulation is used that allows for the propagation of state information ...
    • The Effect of Local Fiber Model On Population Studies 

      Malcolm, James G.; Kubicki, Marek; Shenton, Martha E.; Rathi, Yogesh (Georgia Institute of Technology, 2009-09-24)
      Diffusion tensor imaging has made it possible to evaluate the organization and coherence of white matter fiber tracts. Hence, it has been used in many population studies, most notably, to find abnormalities in schizophrenia. ...
    • An efficient lapped orthogonal transform image coding technique 

      Kumar, Sunil; Rathi, Yogesh; Jain, R. C. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1997-11)
      A fast and computationally less complex coding technique is described which uses partial-lapped orthogonal transform (LOT) computation algorithm and efficiently discards perceptually insignificant high frequency transform ...
    • An efficient numerical method for the solution of the L₂optimal mass transfer problem 

      Haber, Eldad; Rehman, Tauseef ur; Tannenbaum, Allen R. (Georgia Institute of TechnologySociety for Industrial and Applied Mathematics, 2010-02-05)
      In this paper we present a new computationally efficient numerical scheme for the minimizing flow approach for the computation of the optimal L₂mass transport mapping. In contrast to the integration of a time dependent ...
    • Expanded Pharmacokinetic model for population studies in Breast MRI 

      Mohan, Vandana; Shinagawa, Yoshihisa; Jian, Bing; Hermosillo Valadez, Gerardo (Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2008-02-19)
      We propose a new model for pharmacokinetic analysis based on the one proposed by Tofts. Our model both eliminates the need for estimating the Arterial Input Function (AIF) and normalizes analysis so that comparisons across ...
    • Experiments on geometric image enhancement 

      Sapiro, Guillermo; Tannenbaum, Allen R.; You, Yu-La; Kaveh, Mos (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1994-11)
      In this paper we experiment with geometric algorithms for image smoothing. Examples are given for MRI and ATR data. We emphasize experiments with the affine invariant geometric smoother or affine heat equation, originally ...
    • Expressive Autonomous Cinematography for Interactive Virtual Environments 

      Tomlinson, Bill; Blumberg, Bruce; Nain, Delphine (Georgia Institute of TechnologyAssociation for Computing Machinery (ACM), 2000-06)
      We have created an automatic cinematography system for interactive virtual environments. This system controls a virtual camera and lights in a three-dimensional virtual world inhabited by a group of autonomous and ...
    • Fast approximate curve evolution 

      Malcolm, James G.; Rathi, Yogesh; Yezzi, Anthony; Tannenbaum, Allen R. (Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2008-01)
      The level set method for curve evolution is a popular technique used in image processing applications. However, the numerics involved make its use in high performance systems computationally prohibitive. This paper proposes ...
    • Fast approximate surface evolution in arbitrary dimension 

      Malcolm, James G.; Rathi, Yogesh; Yezzi, Anthony; Tannenbaum, Allen R. (Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2008-02)
      The level set method is a popular technique used in medical image segmentation; however, the numerics involved make its use cumbersome. This paper proposes an approximate level set scheme that removes much of the computational ...
    • Fast Multigrid Optimal Mass Transport for Image Registration and Morphing 

      Rehman, Tauseef ur; Pryor, Gallagher D.; Tannenbaum, Allen R. (Georgia Institute of TechnologyBritish Machine Vision Association, 2007-09)
      In this paper we present a novel, computationally efficient algorithm for nonrigid 2D image registration based on the work of Haker et al.[1, 2]. We formulate the registration task as an Optimal Mass Transport (OMT) problem ...
    • Fast Optimal Mass Transport for Dynamic Active Contour Tracking on the GPU 

      Pryor, Gallagher D.; Rehman, Tauseef ur; Lankton, Shawn; Vela, Patricio A.; Tannenbaum, Allen R. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2007-12)
      In computational vision, visual tracking remains one of the most challenging problems due to noise, clutter, occlusion, and dynamic scenes. No one technique has yet managed to solve this problem completely, but those that ...
    • Filtered Multitensor Tractography 

      Malcolm, James G.; Shenton, Martha E.; Rathi, Yogesh (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-09)
      We describe a technique that uses tractography to drive the local fiber model estimation. Existing techniques use independent estimation at each voxel so there is no running knowledge of confidence in the estimated model ...
    • Filtered Tractography: State estimation in a constrained subspace 

      Malcolm, James G.; Shenton, Martha E.; Rathi, Yogesh (Georgia Institute of Technology, 2009-09-24)
      We describe amethod of deterministic tractography using model-based estimation that remains constrained to the subspace of valid tensor mixture models. Existing techniques estimate the local fiber orientation at each ...