Proceedings of IEEE International Conference on Computer Vision

20-23 June 1995

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  • Proceedings of IEEE International Conference on Computer Vision

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (409 KB)
    Freely Available from IEEE
  • Recovering 3D motion of multiple objects using adaptive Hough transform

    Publication Year: 1995, Page(s):284 - 289
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Presents a method to determine the 3D motion of multiple objects from two perspective views. In our method, segmentation is determined based on a 3D rigidity constraint. We divide the input image into overlapping patches, and for each sample of the translation parameter space, we compute the rotation parameters of patches using a least-squares fit. Every patch votes for a sample in the translation... View full abstract»

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  • Auxiliary variables for deformable models

    Publication Year: 1995, Page(s):975 - 980
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    We present a mathematical formulation for curve and surface reconstruction algorithms by introduction of auxiliary variables. For deformable models and templates, two step iterative algorithms have been often used where, at each iteration, the model is first locally deformed according to the potential data attraction and then globally smoothed. We show how these approaches can be interpreted as th... View full abstract»

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  • Topologically adaptable snakes

    Publication Year: 1995, Page(s):840 - 845
    Cited by:  Papers (108)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The paper presents a typologically adaptable snakes model for image segmentation and object representation. The model is embedded in the framework of domain subdivision using simplicial decomposition. This framework extends the geometric and topological adaptability of snakes while retaining all of the features of traditional snakes, such as user interaction, and overcoming many of the limitations... View full abstract»

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  • Matching of 3-D curves using semi-differential invariants

    Publication Year: 1995, Page(s):390 - 395
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    A method for matching 3-D curves under Euclidean motions is presented. Our approach uses a semi-differential invariant description requiring only first derivatives and one reference point, thus avoiding the computation of high order derivatives. A novel curve similarity measure building on the notion of ε-reciprocal correspondence is proposed. It is shown that by combining ε-reciprocal c... View full abstract»

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  • Segmented shape descriptions from 3-view stereo

    Publication Year: 1995, Page(s):102 - 108
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    We address the recovery of segmented, 3-D descriptions of an object from intensity images. We use three views of an object from slightly different viewpoints as our input. For each image we extract a hierarchy of groups based on proximity, parallelism and symmetry in a robust manner. The groups in the three images are matched by computing the epipolar geometry. For each set of matched groups from ... View full abstract»

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  • Face recognition from one example view

    Publication Year: 1995, Page(s):500 - 507
    Cited by:  Papers (153)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    To create a pose-invariant face recognizer, one strategy is the view-based approach, which uses a set of real example views at different poses. But what if we only have one real view available, such as a scanned passport photo-can we still recognize faces under different poses? Given one real view at a known pose, it is still possible to use the view-based approach by exploiting prior knowledge of... View full abstract»

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  • 3D-2D projective registration of free-form curves and surfaces

    Publication Year: 1995, Page(s):549 - 556
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    Some medical interventions require knowing the correspondence between an MRI/CT pre-operative image and the actual position of the patient. Examples occur in neurosurgery, radiotherapy, interventional radiology, but also in video surgery (laparoscopy). We present in this article three new techniques for performing this task without artificial markers. We find the 3D-2D projective transformation (c... View full abstract»

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  • Structure and motion estimation from dynamic silhouettes under perspective projection

    Publication Year: 1995, Page(s):290 - 295
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Addresses the problem of estimating the structure and motion of a smooth curved object from its silhouettes observed over time by a trinocular stereo rig under perspective projection. We first construct a model for the local structure along the silhouette for each frame in the temporal sequence. Successive local models are then integrated into a global surface description by estimating the motion ... View full abstract»

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  • Improving laser triangulation sensors using polarization

    Publication Year: 1995, Page(s):981 - 986
    Cited by:  Papers (10)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    We report a novel application of polarization based vision addressing the robustness of laser triangulation range sensors. Such sensors are based on the accurate detection of a pattern of laser light projected onto a scene, usually a point or line. Typical problems arise with highly specularly reflective surfaces, which can generate visible reflections of the light in various parts of the image. T... View full abstract»

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  • On multi-feature integration for deformable boundary finding

    Publication Year: 1995, Page(s):846 - 851
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Precise segmentation of underlying objects in an image is very important especially for biomedical image analysis. We present an integrated approach for boundary finding using region and curvature information along with the gradient. Unlike the previous methods, where smoothing is enforced by penalizing curvature, here the grey level curvature is used as an extra source of information. However, in... View full abstract»

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  • Shape-extraction for curves using geometry-driven diffusion and functional optimization

    Publication Year: 1995, Page(s):396 - 401
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    In this paper we show how both geometry-driven diffusion and optimization of the Mumford-Shah functional can be used to develop a type of curve-evolution that is able to preserve salient features of closed curves (such as corners and straight line segments), while simultaneously suppressing noise and irrelevant details. The idea is to characterize the curve by means of its angle-function (i.e. the... View full abstract»

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  • 3-D surface reconstruction from stereoscopic image sequences

    Publication Year: 1995, Page(s):109 - 114
    Cited by:  Papers (24)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A stereoscopic scene analysis system for 3-D modeling of objects from stereoscopic image sequences is described. A dense map of 3-D surface points is obtained by image correspondence, object segmentation, interpolation, and triangulation. Emphasis is put on the accurate measurement of image correspondences from grey level images. The surface geometry of each scene object is approximated by a trian... View full abstract»

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  • Invariant-based recognition of complex curved 3D objects from image contours

    Publication Year: 1995, Page(s):508 - 514
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    To recognize three-dimensional objects bounded by smooth curved surfaces from monocular image contours, viewpoint-dependent image features must be related to object geometry. Contour bitangents and inflections along with associated parallel tangents points are the projection of surface points that lie on the occluding contour for a five-parameter family of scaled orthographic projection viewpoints... View full abstract»

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  • Validation of 3-D registration methods based on points and frames

    Publication Year: 1995, Page(s):557 - 562
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    We propose a new method to estimate a rigid transform from a set of 3-D matched points or matched frames, and we concentrate on the analysis of the uncertainty of the estimated transform. The theoretical contributions are an intrinsic model of noise for transformations based on composition rather than addition, a unified formalism for the estimation of both the rigid transform and its covariance m... View full abstract»

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  • Determining facial expressions in real time

    Publication Year: 1995, Page(s):296 - 301
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    We suggest an approach to describing and tracking the deformation of facial features. We concentrate on the mouth since its shape is important in detecting emotion. However, we believe that our system could be extended to deal with other facial features. In our system, the mouth is described by a valley contour which is based between the lips. This contour is shown to exist independently of illumi... View full abstract»

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  • Combining color and geometry for the active, visual recognition of shadows

    Publication Year: 1995, Page(s):203 - 209
    Cited by:  Papers (16)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Shadows are a frequent occurrence, but they cannot be infallibly recognized until a scene's geometry and lighting are known. We present a number of cues which together strongly suggest the identification of a shadow and which can be examined with low cost. The techniques are: a color image segmentation method that recovers single material surfaces as single image regions irregardless of the surfac... View full abstract»

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  • Perceptual organization in an interactive sketch editing application

    Publication Year: 1995, Page(s):597 - 604
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The paper shows how techniques from computational vision can be deployed to support interactive sketch editing. While conventional computer supported drawing tools give users access to visible marks or image objects at a single level of abstraction, a human user's visual system rapidly constructs complex groupings and associations among image elements according to his or her immediate purposes. We... View full abstract»

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  • Automatic generation of GRBF networks for visual learning

    Publication Year: 1995, Page(s):794 - 800
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Learning can often be viewed as the problem of mapping from an input space to an output space. Examples of these mappings are used to construct a continuous function that approximates given data and generalizes for intermediate instances. Generalized Radial Basis Function (GRBF) networks are used to formulate this approximating function. A novel method is introduced to construct an optimal GRBF ne... View full abstract»

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  • Real-time focus range sensor

    Publication Year: 1995, Page(s):995 - 1001
    Cited by:  Papers (31)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    Structures of dynamic scenes can only be recovered using a real-time range sensor. Depth-from-defocus offers a direct solution to fast and dense range estimation. It is computationally efficient as it circumvents the correspondence problem faced by stereo and feature tracking in structure-from-motion. However, accurate depth estimation requires theoretical and practical solutions to a variety of p... View full abstract»

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  • Rigid body segmentation and shape description from dense optical flow under weak perspective

    Publication Year: 1995, Page(s):251 - 256
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    We present an algorithm for identifying and tracking independently moving rigid objects from optical flow. The proposed method uses the fact that each distinct object has a unique epipolar constraint associated with its motion. This is in contrast to using local optical flow information for segmentation. Thus motion discontinuities based on self-occlusion are distinguished from those due to separa... View full abstract»

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  • Site model acquisition and extension from aerial images

    Publication Year: 1995, Page(s):888 - 893
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A system has been developed to acquire, extend and refine 3D geometric site models from aerial imagery. This system hypothesizes potential building roofs in an image, automatically locates supporting geometric evidence in other images, and determines the precise shape and position of the new buildings via multiimage triangulation. Model-to-image registration techniques are applied to align new, in... View full abstract»

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  • Recognition using region correspondences

    Publication Year: 1995, Page(s):8 - 15
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    A central problem in object recognition is to determine the transformation that relates the model to the image, given some partial correspondence between the two. This is useful in determining whether an object is present in an image, and if so, in determining where the object is. We present a novel method of solving this problem that uses region information. In our approach, the model is divided ... View full abstract»

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  • Facial expression recognition using a dynamic model and motion energy

    Publication Year: 1995, Page(s):360 - 367
    Cited by:  Papers (99)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    Previous efforts at facial expression recognition have been based on the Facial Action Coding System (FACS), a representation developed in order to allow human psychologists to code expression from static facial “mugshots.” We develop new more accurate representations for facial expression by building a video database of facial expressions and then probabilistically characterizing the ... View full abstract»

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  • An integral approach to free-formed object modeling

    Publication Year: 1995, Page(s):870 - 875
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Presents a new approach to free-formed object modeling from multiple range images. In most conventional approaches, successive views are registered sequentially. In contrast to the sequential approaches, we propose an integral approach which reconstructs statistically optimal object models by simultaneously aggregating all data from multiple views into a weighted least-squares (WLS) formulation. T... View full abstract»

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