Browsing Biomedical Imaging Lab (Minerva Research Group) by Title
Now showing items 1-20 of 210
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3D Modeling of Patient-Specific Geometries of Portal Veins Using MR Images
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2006)In this note, we present an approach for developing patient-specific 3D models of portal veins to provide geometric boundary conditions for computational fluid dynamics (CFD) simulations of the blood flow inside portal ... -
Active Contours and Optical Flow for Automatic Tracking of Flying Vehicles
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2004)In this paper, we describe fast implementations of optical flow and geometric active contours to reliably track flying vehicles. Given the position of the vehicle at time t-1, optical flow information is used to initially ... -
Affine Invariant Detection: Edges, Active Contours, and Segments
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1996-06)In this paper we undertake a systematic investigation of affine invariant object detection. Edge detection is first presented from the point of view of the affine invariant scale-space obtained by curvature based motion ... -
Affine Invariant Erosion of 3D Shapes
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2001-07)A new definition of affine invariant erosion of 3D surfaces is introduced. Instead of being based in terms of Euclidean distances, the volumes enclosed between the surface and its chords are used. The resulting erosion is ... -
Affine Invariant Surface Evolutions for 3D Image Segmentation
(Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2006-01)In this paper we present an algorithm for 3D medical image segmentation based on an affine invariant flow. The algorithm is simple to implement and semi-automatic. The technique is based on active contours evolving in time ... -
Affine Registration of label maps in Label Space
(Georgia Institute of TechnologyJournal of Computing, 2010-04)Two key aspects of coupled multi-object shape analysis and atlas generation are the choice of representation and subsequent registration methods used to align the sample set. For example, a typical brain image can be labeled ... -
Agitation and Pain Assessment Using Digital Imaging
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-09)Pain assessment in patients who are unable to verbally communicate with medical staff is a challenging problem in patient critical care. The fundamental limitations in sedation and pain assessment in the intensive care ... -
Algorithms for stochastic approximations of curvature flows
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-09)Curvature flows have been extensively considered from a deterministic point of view. They have been shown to be useful for a number of applications including crystal growth, flame propagation, and computer vision. In some ... -
Analysis and design of anisotropic diffusion for image processing
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1994-11)Anisotropic diffusion is posed as a process of minimizing an energy function. Its global convergence behavior is determined by the shape of the energy surface, and its local behavior is described by an orthogonal decomposition ... -
Analysis of arterial sub-trees affected by Pulmonary Emboli
(Georgia Institute of TechnologySociety of Photo-Optical Instrumentation Engineers, 2004-02)Although Pulmonary Embolism (PE) is one of the most common causes of unexpected death in the U.S., it may also be one of the most preventable. Images acquired from 16-slice Computed Tomography (CT) machines of contrast-injected ... -
Analysis of blood vessel topology by cubical homology
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2002-09)We segment and topologically classify brain vessel data obtained from magnetic resonance angiography (MRA). The segmentation is done adaptively and the classification by means of cubical homology, i.e. the computation of ... -
Angle-preserving mappings for the visualization of multi-branched vessels
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2002-09)We employ a conformal mapping technique to flatten tubular structures with multi-branches for visualization of MRA and CT volumetric vessel imagery. This may be used for the study of possible vessel pathology or virtual ... -
Area and Length Minimizing Flows for Shape Segmentation
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1997-06)Several active contour models have been proposed to unify the curve evolution framework with classical energy minimization techniques for segmentation, such as snakes. The essential idea is to evolve a curve (in 20) or a ... -
Automatic Segmentation of Coronary Arteries Using Bayesian Driven Implicit Surfaces
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2007-04)In this paper, we propose a hybrid approach for the automatic three-dimensional segmentation of coronary arteries using multi-scale vessel filtering and a Bayesian probabilistic approach in a level set image segmentation ... -
Automatic tracking of flying vehicles using geodesic snakes and Kalman filtering
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2004-12)This paper describes a tracking algorithm relying on active contours for target extraction and an extended Kalman filter for relative pose estimation. This work represents the first step towards treating the general problem ... -
Behavioral analysis of anisotropic diffusion in image processing
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1996-11)In this paper, we analyze the behavior of the anisotropic diffusion model of Perona and Malik (1990). The main idea is to express the anisotropic diffusion equation as coming from a certain optimization problem, so its ... -
Blind deconvolution of medical ultrasound images: parametric inverse filtering approach
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2007-12)The problem of reconstruction of ultrasound images by means of blind deconvolution has long been recognized as one of the central problems in medical ultrasound imaging. In this paper, this problem is addressed via proposing ... -
Causal power series and the nonlinear standard H∞ problem
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 1997-12)Using a power series approach, we describe a design procedure applicable to analytic nonlinear plants. Our technique is a generalization of the linear H∞ theory. We can now use this theory to solve the full standard problem ... -
Characteristics of second harmonic generation of Lamb waves in nonlinear elastic plates
(Georgia Institute of TechnologyAcoustical Society of America, 2010-04)This paper investigates the characteristics of the second harmonic generation of Lamb waves in a plate with quadratic nonlinearity. Analytical asymptotic solutions to Lamb waves are first obtained through the use of a ... -
Color histogram equalization through mesh deformation
(Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-09)In this paper we propose an extension of grayscale histogram equalization for color images. For aesthetic reasons, previously proposed color histogram equalization techniques do not generate uniform color histograms. Our ...