Proceedings of 12th International Conference on Pattern Recognition

9-13 Oct. 1994

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  • Proceedings of 12th International Conference on Pattern Recognition

    Publication Year: 1994
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    Freely Available from IEEE
  • Guaranteed geometric hashing

    Publication Year: 1994, Page(s):465 - 469 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (471 KB)

    Geometric hashing is an invariant feature-driven approach to model-based object recognition. Previous interest has focused on its ability to accommodate sensor error. This paper presents an enhancement of the geometric hashing technique which guarantees, under only a few constraints, that models will not be missed due to sensor noise. The authors' geometric hashing algorithm enters model affine in... View full abstract»

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  • Generic recognition of articulated objects by reasoning about functionality

    Publication Year: 1994, Page(s):847 - 849 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (265 KB)

    Previous work on the recognition of objects by reasoning about their functionality has not dealt with objects that have moving parts. In this paper we introduce a scenario in which object recognition is accomplished by first deriving an articulated shape model from an observed sequence of 3-D shapes and by then reasoning about the possible functionality of the articulated shape model. View full abstract»

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  • Author index

    Publication Year: 1994, Page(s):865 - 875
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    Freely Available from IEEE
  • Performance evaluation of first order operators

    Publication Year: 1994, Page(s):42 - 46 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (460 KB)

    We address the problems of the influence of the edge orientation on the performance of first order operators. To illustrate, we present the performance evaluation, including a subpixel error of three popular detectors: Canny, Deriche, as well as Shen and Castan View full abstract»

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  • Statistics of surface curvature estimates

    Publication Year: 1994, Page(s):37 - 41 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    Reliable curvature estimation is an important goal in image analysis to provide viewpoint independent cues for shape classification. This paper presents a model of the relationship between the variance of curvature estimates and the image noise. Agreement to within 10% is obtained for 3D range data. Previous models have only provided qualitative agreement with experimental observations. A perturba... View full abstract»

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  • How to track efficiently piecewise curved contours with a view to reconstructing 3D objects

    Publication Year: 1994, Page(s):32 - 36 vol.1
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (508 KB)

    This paper addresses the problem of rigid and nonpolyhedral object tracking in complex environments without a priori knowledge neither on objects nor on the camera motion. The key of our approach is to propose a robust curve based tracking algorithm founded on an iterative registration method and exploiting our rigid snake model. In order to ensure the convergence of the tracking process, we then ... View full abstract»

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  • Physics-based tracking of 3D objects in 2D image sequences

    Publication Year: 1994, Page(s):432 - 436 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (500 KB)

    We present a new technique for tracking 3D objects in 2D image sequences. We assume that objects are constructed from a class of volumetric part primitives. The models are initially recovered using a qualitative shape recovery process. We subsequently track the objects using local forces computed from image potentials. Therefore we avoid the expensive computation of image features. By integrating ... View full abstract»

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  • A genetic algorithm for the detection of 2D geometric primitives in images

    Publication Year: 1994, Page(s):526 - 528 vol.1
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    We investigate the use of genetic algorithms (GAs) for image primitives extraction (such as segments, circles, ellipses or quadrilaterals). This approach completes the well-known Hough transform, in the sense that GAs are efficient when the Hough approach becomes too expensive in memory, i.e. when we search for complex primitives having more than 3 or 4 parameters. A GA is a stochastic technique, ... View full abstract»

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  • Fast 3-D object recognition using feature based aspect-trees

    Publication Year: 1994, Page(s):854 - 857 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (452 KB)

    This contribution focuses on the recognition of a priori known 3-D objects in single 2-D images. The underlying model is embedded in the domain of CAD-based vision using a viewer-centered approach to generate a set of normalized views. They serve as a basis for an optimal selection of properties of features. The idea of an aspect is used for grouping the values of the properties into aspect-trees.... View full abstract»

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  • Recursive image sequence segmentation by hierarchical models

    Publication Year: 1994, Page(s):523 - 525 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (308 KB)

    This paper addresses the problem of image sequence segmentation. A technique using a sequence model based on compound random fields is presented. This technique is recursive in the sense that frames are processed in the same cadency as they are produced. New regions appearing in the sequence are detected by a morphological procedure View full abstract»

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  • Estimation of the second order spatio-temporal derivatives of deforming image curves

    Publication Year: 1994, Page(s):179 - 184 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (588 KB)

    This paper intends to show that the second order spatio-temporal derivatives of de-forming image curves can be computed quite accurately from image sequences. These quantities, related to the second order optical flow parameters, are useful in the computation of the motion and the structure of a 3-D rigid curve from monocular image sequences. We show that they can be estimated directly from the po... View full abstract»

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  • Reconstruction of quadric surface from occluding contour

    Publication Year: 1994, Page(s):27 - 31 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    We present an algebraic method to reconstruct quadric surfaces from occluding contours observed in two images. The occluding contour is the image of a special curve, called rim, on the surface. It is defined by the fact that the optical rays of their points are tangential to the surface. We show that, although the occluding contours in two images do not correspond to the same rim on the surface, w... View full abstract»

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  • Tracking complex primitives in an image sequence

    Publication Year: 1994, Page(s):426 - 431 vol.1
    Cited by:  Papers (32)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1096 KB)

    This paper describes a new approach to track complex primitives along image sequences - integrating snake-based contour tracking and region-based motion analysis. First, a snake tracks the region outline and performs segmentation. Then the motion of the extracted region is estimated by a dense analysis of the apparent motion over the region, using spatio-temporal image gradients. Finally, this mot... View full abstract»

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  • Detection and pose estimation of human face with synthesized image models

    Publication Year: 1994, Page(s):754 - 757 vol.1
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    This paper presents a new method for detecting a human face, and estimating its pose while tracking it in real image sequences. The virtue of the method is that parameterized qualitative features derived from a lot of sampled facial images are introduced in the detection process, and in the face tracking process, some temporary model images of the face with various poses are synthesized by a textu... View full abstract»

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  • Discrete circular arcs

    Publication Year: 1994, Page(s):174 - 178 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    In this contribution we consider in all detail the effect of digitization on circular arcs. Given a specific discrete circular arc we find the set of all continuous arcs which by digitization would result in this pattern. From this characterization we provide optimal estimates of the radius (or curvature) of the original arc. This estimator achieves the ultimate precision one can reach in estimati... View full abstract»

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  • Scale-invariant polyhedral object recognition using fragmentary edge segments

    Publication Year: 1994, Page(s):850 - 853 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    We propose a scale-invariant polyhedral object recognition algorithm that is based on the pose clustering paradigm using fragmentary edge segments. Two novel feature-focus techniques are introduced to reduce the computational complexity for matching a scene with n edge fragments and a model with m edges from Q(m2n2) to O(mn) without loss of matching quality. In addition, we s... View full abstract»

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  • Efficient computation of 3D moments

    Publication Year: 1994, Page(s):22 - 26 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (324 KB)

    In this paper, we proposed a linear-transform-based method to compute 3D moments. Instead of computing the conventional moments directly, we compute the so-called LT moments which are related with the conventional moments by three linear transforms. By choosing appropriately these transforms, it is shown that the computational complexity can be considerably reduced View full abstract»

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  • Construction of a polygonal model using the Fisher-ratio criterion

    Publication Year: 1994, Page(s):210 - 215 vol.1
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (528 KB)

    A method is described to construct a polygonal model for a family of objects, consisting of various classes. The model optimally discriminates between classes on the shape of the contour. The method assumes some characteristic points (landmarks) on the contour are available for comparing corresponding curves over all objects. Relating a feature (angle of directional change) to each point on the cu... View full abstract»

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  • A cooperative integration of stereopsis and optic flow computation

    Publication Year: 1994, Page(s):356 - 360 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (524 KB)

    A cooperative integration of stereopsis and optic flow computation is presented. Central to our approach is the modelling of the visual processes as a sequence of coupled Markov random fields by defining suitable interprocess interactions based on some natural constraints. The integration makes each of the individual processes better constrained and more reliable. Further, as a result of the integ... View full abstract»

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  • Physics-based object pose and shape estimation from multiple views

    Publication Year: 1994, Page(s):326 - 330 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (432 KB)

    This paper presents a new algorithm for object pose and shape estimation from multiple views. Using a qualitative shape recovery scheme the authors first segment the image into parts which belong to a vocabulary of primitives. Based on the additional constraints provided by the qualitative shapes the authors extend their physics-based framework to allow object pose and shape estimation from stereo... View full abstract»

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  • Integrated stereo vision-a multiresolution approach

    Publication Year: 1994, Page(s):714 - 716 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (300 KB)

    The problem of stereo vision is an ill-posed problem in the sense of Hadamard. Motivated by the work of Gamble et al. (1989), Clark and Yullie (1990), Toborg and Hwang (1990), and Barnard (1989), we formulate and setup the problem of stereo vision in an integrated multiresolution framework. The energy functions constructed are interactive in the sense that there is feedforward as well as feedback ... View full abstract»

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  • Texture orientation for sorting photos "at a glance"

    Publication Year: 1994, Page(s):459 - 464 vol.1
    Cited by:  Papers (65)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (684 KB)

    Investigates a measure of "dominant perceived orientation" that has been developed to match the output of a human study involving 40 subjects. The results of this measure are compared with humans analyzing seven "teaser" images to test its effectiveness for finding perceptually dominant orientations. The use of low-level orientation is then applied to a "quick search" problem important in image da... View full abstract»

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  • 3-D scene representation as a collection of images

    Publication Year: 1994, Page(s):689 - 691 vol.1
    Cited by:  Papers (55)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (308 KB)

    We address the problem of the prediction of new views of a given scene from existing weakly or fully calibrated views called reference views. Our method does not make use of a three-dimensional model of the scene, but of the existing relations between the images. The new views are represented in the reference views by a viewpoint and a retinal plane, i.e. by four points which can be chosen interac... View full abstract»

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  • Multi-temperature annealing: a new approach for the energy-minimization of hierarchical Markov random field models

    Publication Year: 1994, Page(s):520 - 522 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    As it is well known, optimization of the energy function of Markov random fields is very expensive. Hierarchical models have usually much more communication per pixel than monogrid ones. This is why classical annealing schemes are too slow, even on a parallel machine, to minimize the energy associated with such a model. However, taking benefit of the pyramidal structure of the model, we can define... View full abstract»

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