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Proceedings of 1994 IEEE Workshop on Motion of Non-rigid and Articulated Objects

11-12 Nov. 1994

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  • Proceedings of 1994 IEEE Workshop on Motion of Non-rigid and Articulated Objects

    Publication Year: 1994
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    Freely Available from IEEE
  • Determining articulated motion from perspective views: a decomposition approach

    Publication Year: 1994, Page(s):126 - 137
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    The problem is to estimate the 3D motion of an articulated object, such as a robot arm or a human body, from a monocular sequence of 2D perspective views. We advocate an approach of decomposition. The object is decomposed into simpler parts, each containing a small number of links. We estimate the motion of the simplest part(s) and then propagate the analysis to the remaining parts of the object. ... View full abstract»

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  • Nonrigid motions as homogeneous transformations

    Publication Year: 1994, Page(s):138 - 143
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    In this paper, we present an approach to modeling nonrigid transformations (equivalently, nonrigid surfaces) by homogeneous transformations, and we illustrate the utility of this approach by describing how we used it to study sequences of static nonrigid motions of a membrane. Experimental results are presented View full abstract»

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  • Spatio-temporal analysis of nonrigid motion from 4D data

    Publication Year: 1994, Page(s):146 - 151
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Presents a method for analysis of nonrigid motion in time sequences of volume images (4D data). In this method, nonrigid motion of the deforming object's contour is dynamically approximated by a deformable surface. In order to reduce the number of parameters describing the deformation, we make use of modal analysis, which provides a spatial smoothing of the surface, and Fourier analysis of the tim... View full abstract»

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  • Adaptive and deformable models based on simplex meshes

    Publication Year: 1994, Page(s):152 - 157
    Cited by:  Papers (11)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Simplex meshes are simply-connected meshes that are topologically the dual of triangulations. We have introduced a simplex mesh representation for recognizing partially-occluded smooth objects. In this paper, we present a physically-based approach for recovering 3D objects, based on the geometry of simplex meshes. Elastic behavior is modelled by local stabilizing functionals controlling the mean c... View full abstract»

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  • Physically-based combinations of views: representing rigid and nonrigid motion

    Publication Year: 1994, Page(s):158 - 164
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Nonrigid motion can be described as morphing or blending between extremal shapes, e.g. heart motion can be described as transitioning between the systole and diastole states. Using physically-based modeling techniques, shape similarity can be measured in terms of forces and strain. This provides a physically-based coordinate system in which motion is characterized in terms of physical similarity t... View full abstract»

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  • Towards structure and motion estimation from dynamic silhouettes

    Publication Year: 1994, Page(s):166 - 171
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Addresses the problem of estimating the structure and motion of a smooth curved object from its silhouettes observed over time by a trinocular imagery. We first construct a model for the local structure along the silhouette for each frame in the temporal sequence. The local models are then integrated into a global surface description by estimating the motion between successive frames. The algorith... View full abstract»

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  • 3D displacement field reconstruction on an irregular domain from planar tagged cardiac MR images

    Publication Year: 1994, Page(s):172 - 177
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    An important application of deformable motion estimation theory is the estimation of heart motion from tagged magnetic resonance image sequences. In tagged MR images, the heart appears with a spatially encoded pattern that moves with the tissue. The position of the tag pattern in each frame of the image sequence can be used to obtain sparse measurements of the heart's 3D displacement field. In thi... View full abstract»

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  • Detecting irregularities in cyclic motion

    Publication Year: 1994, Page(s):178 - 185
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Real cyclic motions tend not to be perfectly even, i.e., the period varies slightly from one cycle to the next, because of physically important changes in the scene. A generalization of period is defined for cyclic motions that makes periodic variation explicit. This representation, called the period trace, is compact and purely temporal, describing the evolution of an object or scene without refe... View full abstract»

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  • Segmenting independently moving, noisy points

    Publication Year: 1994, Page(s):96 - 103
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    There has been much work on using point features tracked through a video sequence to determine structure and motion. In many situations, to use this work, we must first isolate subsets of points that share a common motion. This is hard because we must distinguish between independent motions and apparent deviations from a single motion due to noise. We propose several methods of searching for point... View full abstract»

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  • Contour tracking by multi-frame relaxation

    Publication Year: 1994, Page(s):188 - 193
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    This paper describes a novel feature tracking method. It is based on an inter-frame relaxation technique. This method combines intra-frame and inter-frame constraints on the behaviour of acceptable contour structure. The intra-frame information is represented by both a dictionary of local contour structure and a statistical model of the response of a set of directional feature detection operators.... View full abstract»

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  • Simplifying multiple motion and structure analysis using planar parallax and image warping

    Publication Year: 1994, Page(s):104 - 109
    Cited by:  Papers (3)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Presents a formulation for 3D motion and structure analysis using motion parallax defined with respect to an arbitrary plane in the environment. It is shown that if an image coordinate system is warped using plane projective transformation with respect to a reference view, the residual image motion is dependent only on the epipoles and has a simple relation to the 3D structure. Our computational s... View full abstract»

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  • An efficient method for contour tracking using active shape models

    Publication Year: 1994, Page(s):194 - 199
    Cited by:  Papers (74)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    There has been considerable research interest recently, in the areas of real time contour tracking and active shape models. This paper demonstrates how dynamic filtering can be used in combination with a modal-based flexible shape model to track an articulated non-rigid body in motion. The results show the method being used to track the silhouette of a walking pedestrian in real time. The active s... View full abstract»

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  • A general approach for determining 3D motion and structure of multiple objects from image trajectories

    Publication Year: 1994, Page(s):110 - 115
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Presents a general approach to determine the 3D motion and structure of multiple objects undergoing arbitrary motions. We segment the scene based on 3D motion parameters. First, the general motion model is fitted to each single trajectory. For this nonlinear fitting, initial estimates are obtained by a linear multiple-motion SFM (structure from motion) algorithm using the first two frames. Next, t... View full abstract»

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  • Robust algorithm for motion analysis based on Active Tubes

    Publication Year: 1994, Page(s):200 - 205
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Determining motion of objects is a very important and difficult problem. Many researches have been studied in this field. We previously presented a new model, named Active Tubes, to find motion of non-rigid objects from an image sequence. Active Tubes analyzes the temporal context in a spatio-temporal solid using an energy minimizing model like Snakes. You can consider it as a kind of accumulation... View full abstract»

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  • A system for human motion matching between synthetic and real images based on a biomechanic graphical model

    Publication Year: 1994, Page(s):83 - 88
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A system for analysis and synthesis of human motion is presented. The system consists of an analysis part and a synthesis part. The analysis part can be used automatically or interactively. The automatic analysis part includes the pre-processing, modeling, matching and interpretation phases. The interactive analysis part includes the same phases but with the possibility of user supervision. We pre... View full abstract»

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  • DigitEyes: vision-based hand tracking for human-computer interaction

    Publication Year: 1994, Page(s):16 - 22
    Cited by:  Papers (71)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Computer sensing of hand and limb motion is an important problem for applications in human-computer interaction (HCI), virtual reality, and athletic performance measurement. Commercially available sensors are invasive, and require the user to wear gloves or targets. We have developed a noninvasive vision-based hand tracking system, called DigitEyes. Employing a kinematic hand model, the DigitEyes ... View full abstract»

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  • Tracking facial motion

    Publication Year: 1994, Page(s):36 - 42
    Cited by:  Papers (24)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    We describe a computer system that allows real-time tracking of facial expressions. Sparse, fast visual measurements using 2D templates are used to observe the face of a subject. Rather than track features on the face, the distributed response of a set of templates is used to characterize a given facial region. These measurements ape coupled via a linear interpolation method to states in a physica... View full abstract»

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  • A model based approach to labelling human body outlines

    Publication Year: 1994, Page(s):57 - 62
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    To understand human body motion, one has to be able to identify different body parts. Because of the flexibility of the human body, numerous possible configurations are possible. The paper proposes a novel model based approach to label the outline of a human body. Based on the model, key features of the body can then be identified. In addition, we propose the use of the concept of support, a commo... View full abstract»

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  • Feature grouping in moving objects

    Publication Year: 1994, Page(s):214 - 219
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    We address the problem of grouping points or features common to a single object. In this paper we consider the processing of a sequence of two-dimensional orthogonal projections of a three-dimensional scene containing an unknown number of independently-moving rigid objects. We describe a computationally inexpensive algorithm that can determine the number of bodies and which points belong to which ... View full abstract»

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  • Recognition and localization of articulated objects

    Publication Year: 1994, Page(s):116 - 123
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Presents a method for the localization and interpretation of modeled objects that is general enough to cover articulated and other types of constrained models. The flexibility between components of the model are expressed as spatial constraints which are fused into the pose estimation during the interpretation process. The constraint fusion assists in obtaining a precise and stable pose of each ob... View full abstract»

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  • Incremental model-based discrimination of articulated movement from motion features

    Publication Year: 1994, Page(s):89 - 94
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    Discrimination of articulated movement is a central problem in perception. We present a model-based system designed to discriminate articulated movements and demonstrate its capabilities in distinguishing three human gaits. Recognition proceeds directly from uninterpreted visual motion features. The adaptive model of movement, the scenario, is based on discrete parameterized events separated by pa... View full abstract»

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  • Articulated and elastic non-rigid motion: a review

    Publication Year: 1994, Page(s):2 - 14
    Cited by:  Papers (39)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1204 KB)

    Motion of physical objects is non-rigid, in general. Most researchers have focused on the study of the motion and structure of rigid objects because of its simplicity and elegance. Recently, investigation of non-rigid structure and motion transformation has drawn the attention of researchers from a wide spectrum of disciplines. Since the non-rigid motion class encompasses a huge domain, we restric... View full abstract»

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  • Study of 3-D human movements: influence of the forearm bone morphology on the magnitude of the prosupination motion

    Publication Year: 1994, Page(s):29 - 34
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The purpose of this work is to study the human movements and more precisely the rotation, of the forearm, called the prosupination motion. From medical papers which have analysed the kinematics aspects, we deduce a computer simulation of the prosupination motion. We evaluate the magnitude of the motion detecting automatically collisions between the two bones during the movement. The collision dete... View full abstract»

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  • Active motion-based segmentation of human body outlines

    Publication Year: 1994, Page(s):50 - 56
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    We present an integrated approach towards the segmentation and shape estimation of human body outlines. Initially, we assume that the human body consists of a single part, and we fit a deformable model to the given data using our physics-based shape and motion estimation framework. As an actor attains different postures, new protrusions emerge on the outline. We model these changes in the shape us... View full abstract»

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