Browsing Computer Science by Author "Alon, Jonathan"

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Browsing Computer Science by Author "Alon, Jonathan"

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  • Alon, Jonathan; Athitsos, Vassilis; Sclaroff, Stan (Boston University Computer Science Department, 2005-06-03)
    Gesture spotting is the challenging task of locating the start and end frames of the video stream that correspond to a gesture of interest, while at the same time rejecting non-gesture motion patterns. This paper proposes ...
  • Athitsos, Vassilis; Alon, Jonathan; Sclaroff, Stan; Kollios, George (Boston University Computer Science Department, 2003-11-24)
    This paper introduces BoostMap, a method that can significantly reduce retrieval time in image and video database systems that employ computationally expensive distance measures, metric or non-metric. Database and query ...
  • Alon, Jonathan; Sclaroff, Stan; Kollios, George; Pavlovic, Vladimir (Boston University Computer Science Department, 2003-03-26)
    A new approach is proposed for clustering time-series data. The approach can be used to discover groupings of similar object motions that were observed in a video collection. A finite mixture of hidden Markov models (HMMs) ...
  • Athitsos, Vassilis; Alon, Jonathan; Sclaroff, Stan (Boston University Computer Science Department, 2005-03-16)
    Nearest neighbor classification using shape context can yield highly accurate results in a number of recognition problems. Unfortunately, the approach can be too slow for practical applications, and thus approximation ...
  • Rosales, Rómer; Siddiqui, Matheen; Alon, Jonathan; Sclaroff, Stan (Boston University Computer Science Department, 2001-06)
    An approach for estimating 3D body pose from multiple, uncalibrated views is proposed. First, a mapping from image features to 2D body joint locations is computed using a statistical framework that yields a set of several ...
  • Alon, Jonathan; Sclaroff, Stan (Boston University Computer Science Department, 2000-12-04)
    Standard structure from motion algorithms recover 3D structure of points. If a surface representation is desired, for example a piece-wise planar representation, then a two-step procedure typically follows: in the first ...
  • Sclaroff, Stan; Alon, Jonathan (Boston University Computer Science Department, 1999-07-27)
    We present a framework for estimating 3D relative structure (shape) and motion given objects undergoing nonrigid deformation as observed from a fixed camera, under perspective projection. Deforming surfaces are approximated ...
  • Alon, Jonathan; Athitsos, Vassilis; Sclaroff, Stan (Boston University Computer Science Department, 2005-06-03)
    Nearest neighbor classifiers are simple to implement, yet they can model complex non-parametric distributions, and provide state-of-the-art recognition accuracy in OCR databases. At the same time, they may be too slow for ...
  • Alon, Jonathan; Sclaroff, Stan (Boston University Computer Science Department, 1999-12-01)
    A specialized formulation of Azarbayejani and Pentland's framework for recursive recovery of motion, structure and focal length from feature correspondences tracked through an image sequence is presented. The specialized ...
  • Alon, Jonathan; Athitsos, Vassilis; Yuan, Quan; Sclaroff, Stan (Boston University Computer Science Department, 2004-03-08)
    A framework for the simultaneous localization and recognition of dynamic hand gestures is proposed. At the core of this framework is a dynamic space-time warping (DSTW) algorithm, that aligns a pair of query and model ...
  • Alon, Jonathan (Boston University Computer Science Department, 2006-09-18)
    Spotting patterns of interest in an input signal is a very useful task in many different fields including medicine, bioinformatics, economics, speech recognition and computer vision. Example instances of this problem include ...
  • Nunziati, Walter; Alon, Jonathan; Sclaroff, Stan; Del Bimbo, Alberto (Boston University Computer Science Department, 2005-05-19)
    We introduce a method for recovering the spatial and temporal alignment between two or more views of objects moving over a ground plane. Existing approaches either assume that the streams are globally synchronized, so that ...

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