Now showing items 1-20 of 23

    • 3-D Reconstruction of Shaded Objects from Multiple Images Under Unknown Illumination 

      Jin, Hailin; Wang, Dejun; Cremers, Daniel; Prados, Emmanuel; Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologySpringer Verlag, 2008-03)
      We propose a variational algorithm to jointly estimate the shape, albedo, and light configuration of a Lambertian scene from a collection of images taken from different vantage points. Our work can be thought of as extending ...
    • Active Geodesics: Region based Active Contour Segmentation with a Global Edge based Constraint 

      Appia, Vikram; Yezzi, Anthony (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2011-11)
      We present an active geodesic contour model in which we constrain the evolving active contour to be a geodesic with respect to a weighted edge-based energy through its entire evolution rather than just at its final state ...
    • Curious snakes: an active contour formulation of information-driven minimum-latency boundary detection 

      Soatto, Stefano; Sundaramoorthi, Ganesh; Yezzi, Anthony (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-06)
      We present a region-based active contour detection algorithm for objects that exhibit relatively homogeneous photometric characteristics (e.g. smooth color or gray levels), embedded in complex background clutter. Current ...
    • Dynamic shape and appearance modeling via moving and deforming layers 

      Jackson, Jeremy D.; Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologySpringer Verlag, 2008-08)
      This model is based on a collection of overlapping layers that can move and deform, each supporting an intensity function that can change over time. We discuss the generality and limitations of this model in relation to ...
    • In-loop feature tracking for structure and motion with out-of-core optimization 

      Herrero, Nicolas; Landabaso, Jose-Luis; Gallego, Guillermo; Pujol-Alcolado, Jose-Carlos (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-09)
      In this paper, a novel and approach for obtaining 3D models from video sequences captured with hand-held cameras is addressed. We define a pipeline that robustly deals with different types of sequences and acquiring devices. ...
    • Integral Invariant Signatures 

      Manay, Siddharth; Hong, Byung-Woo; Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologySpringer-Verlag, 2004-05)
      For shapes represented as closed planar contours, we introduce a class of functionals that are invariant with respect to the Euclidean and similarity group, obtained by performing integral operations. While such integral ...
    • Localized Principal Component Analysis based Curve Evolution: A Divide and Conquer Approach 

      Appia, Vikram; Ganapathy, Balaji; Yezzi, Anthony; Faber, Tracy (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2011-11)
      We propose a novel localized principal component analysis (PCA) based curve evolution approach which evolves the segmenting curve semi-locally within various target regions (divisions) in an image and then combines these ...
    • Multiview Stereo Reconstruction of Dense Shape and Complex Appearance 

      Jin, Hailin; Soatto, Stefano; Yezzi, Anthony (Georgia Institute of TechnologySpringer Verlag, 2005-07)
      We address the problem of estimating the three-dimensional shape and complex appearance of a scene from a calibrated set of views under fixed illumination. Our approach relies on a rank condition that must be satisfied ...
    • A New Geometric Metric in the Space of Curves, and Applications To Tracking Deforming Objects by Prediction and Filtering 

      Sundaramoorthi, Ganesh; Mennucci, Andrea C.; Soatto, Stefano; Yezzi, Anthony (Georgia Institute of TechnologySociety for Industrial and Applied Mathematics, 2011-02)
      We define a novel metric on the space of closed planar curves which decomposes into three intuitive components. According to this metric, centroid translations, scale changes, and deformations are orthogonal, and the metric ...
    • Offshore stereo measurements of gravity waves 

      Benetazzo, Alvise; Fedele, Francesco; Gallego, Guillermo; Shih, Ping-Chang; Yezzi, Anthony (Georgia Institute of Technology, 2012-06)
      Stereo video techniques are effective for estimating the space-time wave dynamics over an area of the ocean. Indeed, a stereo camera view allows retrieval of both spatial and temporal data whose statistical content is ...
    • Properties of Sobolev-type metrics in the space of curves 

      Mennucci, Andrea C.; Yezzi, Anthony; Sundaramoorthi, Ganesh (Georgia Institute of TechnologyEuropean Mathematical Society, 2008)
      We define a manifold M where objects c ϵ M are curves, which we parameterize as c : S¹ → R ⁿ (n ≥2, S¹ is the circle). Given a curve c, we define the tangent space TcM of M at c including in it all deformations h : S¹ → R ...
    • Recursive Camera Autocalibration with the Kalman Filter 

      Gallego, Guillermo; Ronda, José I.; Valdés, Antonio; García, Narciso (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2007)
      Given a projective reconstruction of a 3D scene, we address the problem of recovering the Euclidean structure of the scene in a recursive way. This leads to the application of Kalman filtering to the problem of camera ...
    • Region matching with missing parts 

      Duci, Alessandro; Yezzi, Anthony; Mitter, Sanjoy; Soatto, Stefano (Georgia Institute of TechnologySpringer Verlag, 2002-05)
      We present a variational approach to the problem of registering planar shapes despite missing parts. Registration is achieved through the evolution of a partial differential equation that simultaneously estimates the shape ...
    • Region-based segmentation on evolving surfaces with application to 3D reconstruction of shape and piecewise constant radiance 

      Jin, Hailin; Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologySpringer-Verlag, 2004-05)
      We consider the problem of estimating the shape and radiance of a scene from a calibrated set of images under the assumption that the scene is Lambertian and its radiance is piecewise constant. We model the radiance ...
    • Robust 3D pose estimation and efficient 2D region-based segmentation from a 3D shape prior 

      Dambreville, Samuel; Sandhu, Romeil; Yezzi, Anthony; Tannenbaum, Allen R. (Georgia Institute of TechnologySpringer Verlag, 2008-10)
      In this work, we present an approach to jointly segment a rigid object in a 2D image and estimate its 3D pose, using the knowledge of a 3D model. We naturally couple the two processes together into a unique energy functional ...
    • Space-time Measurements of Oceanic Sea States 

      Fedele, Francesco; Benetazzo, Alvise; Gallego, Guillermo; Shih, Ping-Chang; Yezzi, Anthony; Barbariol, Francesco; Ardhuin,Fabrice (Georgia Institute of TechnologyElsevier, 2013-10)
      Stereo video techniques are effective for estimating the space-time wave dynamics over an area of the ocean. Indeed, a stereo camera view allows retrieval of both spatial and temporal data whose statistical content is ...
    • Stereoscopic Segmentation 

      Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2001-07)
      We cast the problem of multiframe stereo reconstruction of a smooth shape as the global region segmentation of a collection of images of the scene. Dually, the problem of segmenting multiple calibrated images of an ...
    • Tales of Shape and Radiance in Multi-view Stereo 

      Soatto, Stefano; Yezzi, Anthony; Jin, Hailin (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2003-10)
      To what extent can three-dimensional shape and radiance be inferred from a collection of images? Can the two be estimated separately while retaining optimality? How should the optimality criterion be computed? When is ...
    • Variational multiframe stereo in the presence of specular reflections 

      Jin, Hailin; Yezzi, Anthony; Soatto, Stefano (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2002-06)
      We consider the problem of estimating the surface of an object from a calibrated set of views under the assumption that the reflectance of the object is non-Lambertian. In particular, we consider the case when the object ...
    • Variational Stereo Imaging of Oceanic Waves with Statistical Constraints 

      Gallego, Guillermo; Yezzi, Anthony; Fedele, Francesco; Benetazzo, Alvise (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2013-06)
      An image processing observational technique for the stereoscopic reconstruction of the wave form of oceanic sea states is developed. The technique incorporates the enforcement of any given statistical wave law modeling the ...