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
  • Edge detection and curve enhancement using the facet model and parametrized relaxation labelling

    Publication Year: 1994, Page(s):1 - 5 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (514 KB)

    We present a method for detecting and labeling the edge structures in digital grey-scale images in two distinct stages: 1) a variant of the cubic facet model detects location, orientation and curvature of the putative edge points; and 2) a relaxation labeling network reinforces meaningful edge structures and suppresses noisy edges. Each node label of this network is a 3D vector parametrizing the o... View full abstract»

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  • A step edge detector algorithm based on symbolic analysis

    Publication Year: 1994, Page(s):6 - 10 vol.1
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    This paper analyzes the noise error, in both the module and the argument in the calculation of the gradient vector of the images illumination function. The results show that the behavior of the argument is more robust than that of the module. A proposal is made for a symbolic analysis of the argument of the gradient vector to detect the contour of the objects in the image. This shows that it is po... View full abstract»

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  • Super-resolution estimation of edge images

    Publication Year: 1994, Page(s):11 - 16 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    A hidden Markov model, which describes the evolution of a (binary) edge-image along the resolution axis, is presented. The model integrates two layers: A hidden layer consists of sources having the ability of "breeding" along the resolution axis according to a Markovian rule. A second layer consists of a Gibbs random field which is defined by all the sources. The available image is a realization o... View full abstract»

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  • A performance measure of boundary detection algorithms

    Publication Year: 1994, Page(s):17 - 21 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    In this paper we derive a quality measure for analysing the performance of algorithms which seek to find boundaries and boundary models between regions of differing mean grey-level value. The measure can be used to compare different approaches and, more importantly, it can also be used as a first step to building self-optimising vision systems that can automatically optimise important parameters a... View full abstract»

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  • Efficient computation of 3D moments

    Publication Year: 1994, Page(s):22 - 26 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (369 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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  • Reconstruction of quadric surface from occluding contour

    Publication Year: 1994, Page(s):27 - 31 vol.1
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (597 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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  • 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 (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (557 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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  • Statistics of surface curvature estimates

    Publication Year: 1994, Page(s):37 - 41 vol.1
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (316 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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  • Performance evaluation of first order operators

    Publication Year: 1994, Page(s):42 - 46 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (512 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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  • An effective image thresholding method using a fuzzy compactness measure

    Publication Year: 1994, Page(s):47 - 51 vol.1
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    This paper presents an improved method for image thresholding by optimization of fuzzy compactness which was originally introduced by Pal-Rosenfeld (1988). In our method a set of asymmetric S-functions whose windows are located in the same range are used as membership functions for obtaining fuzzy compactness. This avoids the problem which may occur in the original algorithm by unsuitably choosing... View full abstract»

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  • Detecting junctions using properties of the Laplacian of Gaussian detector

    Publication Year: 1994, Page(s):52 - 56 vol.1
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    This paper describes a fast junction detection algorithm using the Laplacian of Guassian detector. We propose a general junction model and analyze its behavior in scale space. This study shows two properties: the Laplacian of Gaussian is zero at any junction and it has one or several elliptic extrema that always lie inside the junction sectors. These extrema move in scale space on lines passing by... View full abstract»

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  • Virtual line segment-based Hough transform

    Publication Year: 1994, Page(s):57 - 62 vol.1
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (553 KB)

    The generalized Hough transform (GHough) is a useful technique for detecting and locating 2D shapes. However, GHough requires a 4D accumulator array to detect objects of unknown scale and orientation. In this paper, we propose an extension of GHough, the virtual line segment-based Hough transform (VHough) that requires much less storage than GHough to accurately determine the scale and orientation... View full abstract»

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  • Using grey-level models to improve active shape model search

    Publication Year: 1994, Page(s):63 - 67 vol.1
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    We describe methods for using flexible models to locate structures in images. We have previously described statistical models of shape and shape variability which can be used for this purpose (active shape models). In this paper we show how statistical models of grey-level appearance can be incorporated, leading to improved reliability and accuracy. We describe experiments designed to: 1) test how... View full abstract»

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  • Controlling growing snakes by using key-points

    Publication Year: 1994, Page(s):68 - 73 vol.1
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    In the present paper we address the problem of establishing contours in static monocular scenes. We propose to use features from unified edge and key-point detection to drive an active contour model. We present a framework for image segmentation consisting of: 1) detection of 1D and 2D intensity discontinuity, i.e. general edges and key-points; 2) reformulation of the active contour model to an ex... View full abstract»

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  • A robust technique for the estimation of the deformable hyperquadrics from images

    Publication Year: 1994, Page(s):74 - 78 vol.1
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (570 KB)

    We present a robust technique for the estimation of deformable hyperquadrics from images. Hyperquadrics are volumetric shape models that include superquadrics as a special case. Recovering hyperquadric parameters is difficult not only due to the existence of many local minima in the error function but also due to the existence of an infinite number of global minima (with zero error) that do not co... View full abstract»

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  • Fitting 3-D data using superquadrics and free-form deformations

    Publication Year: 1994, Page(s):79 - 83 vol.1
    Cited by:  Papers (13)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (711 KB)

    Recovery of 3D data with simple parametric models has been the subject of many studies over the last ten years. Many have used the notion of superquadrics, introduced for graphics in Barr (1994). It appears however that whilst superquadrics could describe a wide variety of forms, they are too simple to recover and describe complex shapes. This paper describes a two-step method to fit a parametric ... View full abstract»

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  • Automation of fluorescent dot counting in cell nuclei

    Publication Year: 1994, Page(s):84 - 87 vol.1
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    We have developed a completely automated fluorescence microscope system that can examine 500 cells in approximately 20 minutes to determine the number of labeled chromosomes (seen as dots) in each cell nucleus. This system works with two fluorescent dyes-one for the DNA hybridization dots (e.g. FITC) and one for the cell nucleus (e.g. DAPI). After the stage has moved to a new field the image is au... View full abstract»

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  • Image analysis for automated tracking in robot-assisted endoscopic surgery

    Publication Year: 1994, Page(s):88 - 92 vol.1
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (589 KB)

    This paper describes a practical and reliable image analysis and tracking algorithm to achieve automated instrument localization and scope manoeuvring in endoscopic surgery. View full abstract»

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  • Interactive analysis of multi-spectral images using a Hilbert curve

    Publication Year: 1994, Page(s):93 - 97 vol.1
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (495 KB)

    There have been many new developments in interactive analysis for multi-spectral images in the research of remote sensing. In general, the methods used are linear transformations such as principal component analysis. In this paper, the authors present a new interactive method for classifying multi-spectral images using a Hilbert curve which is a one-to-one mapping and preserves the neighborhood as... View full abstract»

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  • Urban area detection in satellite images using map knowledge by a feedback control technique

    Publication Year: 1994, Page(s):98 - 102 vol.1
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    A new technique for urban area detection in satellite images by integrating geographic map knowledge is presented. Satellite images are modeled by Markov random fields and digitized maps are used as a priori knowledge of the scene under analysis. An iterative scheme is proposed to increase the robustness of scene labeling algorithms by means of a feedback control. Experimental results on urban are... View full abstract»

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  • A new robust approach to image shading analysis and 3-D shape reconstruction

    Publication Year: 1994, Page(s):103 - 107 vol.1
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    New robust techniques for the analysis of the first and second order discrete variational structure of images are introduced. Their application to parametric surface recovery from shading is presented. The theoretical groundings are described along with promising preliminary experimental results. View full abstract»

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  • From an intensity image to 3-D segmented descriptions

    Publication Year: 1994, Page(s):108 - 113 vol.1
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    Addresses the inference of 3-D segmented descriptions of complex objects from a single intensity image. The authors' approach is based on the analysis of the projective properties of a small number of generalized cylinder primitives and their relationships in the image which make up common man-made objects. Past work on this problem has either assumed perfect contours as input or used 2-dimensiona... View full abstract»

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  • Direct computation of shape from shading

    Publication Year: 1994, Page(s):114 - 119 vol.1
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    A direct method for the recovery of surface shape from image shading is presented. The method in its basic form is applicable to shading patterns obtained when a distant overhead point light-source illuminates a convex or concave Lambertian surface possessing a single extremal point at which surface height has either a local maximum or local minimum. A key quality of the method is its ability to o... View full abstract»

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  • Global shape from shading

    Publication Year: 1994, Page(s):120 - 125 vol.1
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (667 KB)

    A new approach for the reconstruction of a smooth three dimensional object from its two dimensional gray level image is presented. An algorithm based on topological properties of simple smooth surfaces is provided to solve the problem of global reconstruction. Classifying singular points in the shading image as maxima minima and two kinds of saddle points, serves as the key to the solution of the ... View full abstract»

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