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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
    Request permission for commercial reuse | PDF file iconPDF (887 KB)
    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
  • Thinning by thickening: using Gaussian filtering to perform feature preserving thinning

    Publication Year: 1994, Page(s):532 - 535 vol.1
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper investigates thinning as applied to feature-based, off-line handwritten cursive and printed characters. In this report, the sources of errors introduced by conventional thinning processes are considered. A novel method to reduce these errors using gray level Gaussian filtering and gray level etching is presented and justified. Experimental results are given View full abstract»

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  • Determination of proportions and entropy of land use mixing in pixels of a multispectral satellite image

    Publication Year: 1994, Page(s):798 - 800 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Deals with a form of knowledge of land use relating to mixture percentages. The authors present a method for the determination of mixture percentages in pixels of a multispectral satellite scene (Landsat TM or SPOT XS). This method is applied to images after correction for topographic and atmospheric effects. They continue with a description of the linear analysis of the satellite scene and captur... View full abstract»

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  • Curve-like sets, normal complexity, and representation

    Publication Year: 1994, Page(s):216 - 221 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    Proposes a theory of the complexity of curves that is sufficient to separate those which extend along their length (e,g., in one dimension) from those that cover an area (e.g., 2-D). The theory is based on original results in geometric measure theory, and is applied to the problems of (i) perceptual grouping and (ii) physiological interpretation, of axonal arbors in developing neurons View full abstract»

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  • Range-speed imaging with FM-CW signaling

    Publication Year: 1994, Page(s):529 - 531 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    This paper presents a method for range-speed imaging of moving targets. The approach is based on illuminating the target region with an FM-CW signal. The inversion in this imaging problem involves a partitioning of the echoed signals in the frequency domain followed by a transformation. The system model and inversion in this imaging method does not approximate a moving target's Doppler shift to be... View full abstract»

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  • Partial matching of 3-D objects in CAD/CAM systems

    Publication Year: 1994, Page(s):483 - 487 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    This application presents an algorithm for model-based partial recognition of CAD/CAM objects in 3-D space. Its main goal is to serve as an industrial application in robotic aided production lines and to facilitate the programming of process robots. Hence, a special emphasis is given to its practical capabilities. The recognition algorithm is invariant to the 3-D similarity transformation: rotatio... View full abstract»

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  • Automatic reading of analog display instruments

    Publication Year: 1994, Page(s):794 - 797 vol.1
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A general design strategy based on experiences of a successful application project concerning the reading of analog devices in order to automate the reading process is presented. The problem space is defined and a description language is introduced which controls the interpretation of specific types of instruments and decouples recognition of primitiva and formation of an aspired result. Furthermo... 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 genetic algorithm for the detection of 2D geometric primitives in images

    Publication Year: 1994, Page(s):526 - 528 vol.1
    Cited by:  Papers (21)
    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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  • Symmetry of fuzzy data

    Publication Year: 1994, Page(s):499 - 504 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Symmetry is usually viewed as a discrete feature: an object is either symmetric or non-symmetric. Following the view that symmetry is a continuous feature, a continuous symmetry measure (CSM) has been developed to evaluate symmetries of shapes and objects. In this paper the authors extend the symmetry measure to evaluate the imperfect symmetry of fuzzy shapes, i.e. shapes with uncertain point loca... View full abstract»

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  • Applications of non-metric vision to some visual guided tasks

    Publication Year: 1994, Page(s):132 - 136 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Presents a stratification of geometric information available from stereovision in three levels: Euclidean, affine and projective, depending upon the kind of calibration that has been obtained for the stereo rig. The authors then focus on the last two levels: they show how affine calibration can be achieved from real images without the need of calibration patterns and how to use projective and affi... View full abstract»

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  • Estimation of 3-D parametric models from shading image using genetic algorithms

    Publication Year: 1994, Page(s):668 - 670 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    In this paper, a method for estimating parameters of a 3-D shape from a 2-D shading image using a genetic algorithms (GAs) is proposed. The shape of the object is represented by a superquadrics model, and then the model parameters are coded for application to GAs. The coded string is evaluated according to the similarity of the shading image calculated from the 3-D model shape represented by the p... View full abstract»

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  • Acquiring 3D models from rotation and highlights

    Publication Year: 1994, Page(s):331 - 336 vol.1
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    This paper proposes an approach to acquire 3D models of objects with specular reflectance for graphics use. Highlight and rotation informations are employed in the model recovery. The authors control object rotation and extract motion of a highlight stripe, from which the object shape can be qualitatively inferred and quantitatively reconstructed by solving a first-order linear differential equati... View full abstract»

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  • Automated detection of cowhide defects using Markov random field techniques

    Publication Year: 1994, Page(s):791 - 793 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    We deal with the automated detection of cowhide defects. First we introduce a local contrast measure in order to take into account efficiently salient features for discrimination between defective and no defective regions. An Ising model serves as prior model for reinforcing region connectedness. We then propose a two-stages optimization algorithm: first a very fast one-pass step producing a rough... 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 commercial reuse | Click to expandAbstract | PDF file iconPDF (544 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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  • 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 (13)
    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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  • Recognising groups of curves based on new affine mutual geometric invariants, with applications to recognizing intersecting roads in aerial images

    Publication Year: 1994, Page(s):205 - 209 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    This paper treats some of the problem in recognizing the geometry of objects composed of groups of curves that undergo arbitrary affine transformations, providing the objects can be invariantly segmented into groups of curves representable by third degree implicit polynomials. As an illustrative example, the authors treat the problem of representing and recognizing portions of roads in aerial imag... 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 (57)  |  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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  • 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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  • ScilImage: an environment for collaborative use and development of image processing software

    Publication Year: 1994, Page(s):543 - 545 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    This paper presents a brief overview of a portable multi-layered interactive environment for software development and use, and a class based infrastucture for image processing. The environment consists of a library handler, a C interpreter, a command expander, a menu and dialog generator, and a visual programming interface. It forms a proper vehicle for development and exchange of (image processin... View full abstract»

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  • Online color camera calibration

    Publication Year: 1994, Page(s):232 - 237 vol.1
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    This paper presents a practical approach to online color camera calibration under changing illumination conditions. Calibration is based on a color camera model and color constancy. In the first stage of the calibration a reconstruction of the current illuminant is performed based on an image taken from a scene with a calibrated color set. Using the updated power spectrum distribution of the curre... View full abstract»

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  • Propagating covariance in computer vision

    Publication Year: 1994, Page(s):493 - 498 vol.1
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    This paper describes how to propagate approximately additive random perturbations through any kind of vision algorithm step in which the appropriate random perturbation model for the estimated quantity produced by the vision step is also an additive random perturbation. The author assumes that the vision algorithm step can be modeled as a calculation (linear or nonlinear) that produces an estimate... View full abstract»

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