By Topic

Nonrigid and Articulated Motion Workshop, 1997. Proceedings., IEEE

Date 16-16 June 1997

Filter Results

Displaying Results 1 - 18 of 18
  • Proceedings IEEE Nonrigid and Articulated Motion Workshop

    Publication Year: 1997
    Request permission for commercial reuse | PDF file iconPDF (137 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 1997, Page(s): 145
    Request permission for commercial reuse | PDF file iconPDF (32 KB)
    Freely Available from IEEE
  • Frame-based 4D interactive modeling of heart motion

    Publication Year: 1997, Page(s):128 - 135
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    Temporal abnormalities in heart wall motion are important diagnostic indicators of cardiac disease. Limitations in cardiac image quality and resolution necessitate the guidance of an experienced user or clinician to define the inside and outside boundaries of the heart. The authors describe methods for reconstructing the spatio-temporal behavior of the heart from magnetic resonance cine images in ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A three-dimensional model of human lip motions trained from video

    Publication Year: 1997, Page(s):46 - 53
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    We present a 3D model of human lips and develop a framework for training it from real data. The model starts off with generic physics specified with the finite element method and “learns” the correct physics through observations. The model's physics allow physically-based regularization between sparse observation points and the resulting set of deformations are used to derive the corre... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The velocity snake

    Publication Year: 1997, Page(s):70 - 79
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    We present a new active contour model for boundary tracking and motion estimation of non-rigid objects, which results from applying a velocity control to the class of elastodynamical contour models, known as snakes. The proposed control term is the outcome of an energy dissipation function which measures the difference between the contour velocity and the apparent velocity of the image (optical fl... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modeling spatial-temporal patterns in facial articulation

    Publication Year: 1997, Page(s):54 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    In this paper, a new method of modeling human facial articulation is proposed. The approach contains three major parts: the spatial dimension reduction through principal component analysis; the temporal function approximation using the sample basis function which is similar to the facial articulation process; and the learning algorithm which can improve the recognition and the compression capabili... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Global versus structured interpretation of motion: moving light displays

    Publication Year: 1997, Page(s):18 - 25
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    Moving light displays (MLDs) have been used extensively to study motion perception and perception of the human gait in particular. MLD perception is largely considered to be structural, i.e., perception depends on identification of human kinematic structure. However, work by Little and Boyd (1996) has shown that it is possible to recognize individual people, from their gaits, by non-structural mea... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tracking of persons in monocular image sequences

    Publication Year: 1997, Page(s):2 - 9
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    We present an approach to extract quantitative geometric descriptions of the movements of persons by fitting the projection of a 3-dimensional human model to consecutive frames of an image sequence. The kinematics of the human model is given by a homogeneous transformation tree and its body parts are modeled by right-elliptical cones. The proposed approach can determine the values of a varying num... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A 3D optical flow approach to addition of deformable PET volumes

    Publication Year: 1997, Page(s):136 - 143
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A method for combining datasets from gated cardiac PET acquisitions is described. Optical flow techniques are used to accurately model non-rigid motion present during the cardiac cycle so that a one-to-one mapping is found between each voxel of two gated volumes. Using this mapping, images can be combined to produce a composite dataset with improved statistics and reduced motion induced blur. Like... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Human skin and hand motion analysis from range image sequences using nonlinear FEM

    Publication Year: 1997, Page(s):80 - 88
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1280 KB)

    We propose new methods for human tissue motion analysis from range image sequences using the nonlinear finite element method (FEM). The approach combines range data, mechanics of human tissues, and dynamics of their motion using nonlinear finite element models. We are able to evaluate the changes in strain distribution over time. Given images at two time instances and their corresponding features,... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Elastic spline models for human cardiac motion estimation

    Publication Year: 1997, Page(s):120 - 127
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Elastic splines (including dynamic “snakes” and elastic contours), minimising an energy norm of the membrane and/or thin-plate types, have been used to model many surfaces in visual reconstruction and related biomedical applications. The authors model the displacement of the material between successive cardiac images using vector splines. They define a family of elastic splines. These ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic simulation of the jaw and chewing muscles for maxillofacial surgery

    Publication Year: 1997, Page(s):104 - 111
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The need for simulation in medical environments increases with the complexity and risks of operations. Exact geometric planning is one of the main problems a surgeon has to deal with. The goal of the authors' research is the development of a graphical simulation of the human mastication system. Therefore, they are developing an integrated model of the jaw by parameterizing the bones (maxilla and m... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimation of articulated motion using kinematically constrained mixture densities

    Publication Year: 1997, Page(s):10 - 17
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    We address the problem of articulated posture estimation in its general form. Namely, the recovery of full 3D articulated posture parameters from an uncontrolled scene. Stochastic modeling of low-level segmented image data is unified with models of object kinematic structure through a constrained mixture of observation processes. A modified expectation-maximization algorithm is proposed for this p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Human motion analysis: a review

    Publication Year: 1997, Page(s):90 - 102
    Cited by:  Papers (116)  |  Patents (228)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1100 KB)

    Human motion analysis is receiving increasing attention from computer vision researchers. This interest is motivated by a wide spectrum of applications, such as athletic performance analysis, surveillance, man-machine interfaces, content-based image storage and retrieval, and video conferencing. The paper gives an overview of the various tasks involved in motion analysis of the human body. The aut... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Segmentation of range data for the automatic construction of models of articulated objects

    Publication Year: 1997, Page(s):62 - 69
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    We consider the problem of automatically constructing geometric models of articulated objects from example range data. The problem of automatic model construction has been investigated in some depth for rigid objects but these do not extend easily to the articulated case. The problem arises because of the need to register surface measurements taken from different viewpoints into a common reference... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Measuring lesion growth from 3D medical images

    Publication Year: 1997, Page(s):112 - 119
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Evaluating precisely the temporal variations of lesion volumes is very important for at least three types of practical applications: pharmaceutical trials, decision making for drug treatment or surgery and patient follow-up. The authors present a volumetric analysis technique, combining precise rigid registration of 3D medical images, nonrigid deformation computation and flowfield analysis. Their ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Virtual humans for animation, ergonomics, and simulation

    Publication Year: 1997, Page(s):28 - 36
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The last few years have seen great maturation in the computation speed and control methods needed to portray 3D virtual humans suitable for real interactive applications. We first describe the state of the art, then focus on the particular approach taken at the University of Pennsylvania with the Jack system. Various aspects of real-time virtual humans are considered such as appearance and motion,... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A configuration space approach for efficient animation of human figures

    Publication Year: 1997, Page(s):38 - 45
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    We propose an efficient method for animation of virtual human models in an environment of obstacles. A nearby target location reachable by a human figure is given and a search is performed in the object space encompassing obstacles to obtain an optimum configuration. The goal is realized by simplifying the configuration space of a human model into two dimensions and then projecting a discretized o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.