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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
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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
  • Homogeneity & texture. General approach

    Publication Year: 1994, Page(s):592 - 594 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The formal definition of image homogeneity and texture is proposed. The notion of double-raster characteristic of the piecewise-homogeneous image is used for stating in a general case the problem of generating the image with the given features. The randomized algorithm of solving this problem by using the double-raster probability model of the image is investigated. The possible applications of th... View full abstract»

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  • Surface inspection using texture recognition

    Publication Year: 1994, Page(s):589 - 591 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    This paper presents a novel approach to automating the visual inspection of magnetic disks. In commercial production, quality control is currently achieved by means of functional tests. Visual inspection of the disk surface is required to achieve improved reliability. A novel method for automating visual inspection which relies on texture recognition is presented. The method produces an approximat... 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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  • Foreign object detection via texture analysis

    Publication Year: 1994, Page(s):586 - 588 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper describes a monitoring system which detects contaminants such as pieces of stone or fragments of glass in food stuffs. The X-ray images of the food stuffs are irregular and highly textured and are thus analysed using an artificial neural network technique for texture recognition. The advantage over the existing methods of inspection is that they achieve a greater capability of reliably ... 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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  • Performance evaluation of texture measures with classification based on Kullback discrimination of distributions

    Publication Year: 1994, Page(s):582 - 585 vol.1
    Cited by:  Papers (244)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    This paper evaluates the performance both of some texture measures which have been successfully used in various applications and of some new promising approaches. For classification a method based on Kullback discrimination of sample and prototype distributions is used. The classification results for single features with one-dimensional feature value distributions and for pairs of complementary fe... View full abstract»

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  • Normalization of face images using few anchors

    Publication Year: 1994, Page(s):761 - 763 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Presents a procedure for facial normalization which is determined by the translocation of few anchors in two sets. The first set determines the affine part of the transformation and is used for overcoming change in viewpoint and scale. The second set is used for normalization of expression. A generalization of radial basis functions theory is used for generating the appropriate mapping. Only a few... View full abstract»

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  • Rigid registration of 3-D objects by motion analysis

    Publication Year: 1994, Page(s):579 - 581 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The registration of 3-D objects is an important problem in the image processing field. When using landmarks or specific features is not possible for that task, iterative methods can be used with profit, but suffer from the presence of local minima. We present here a general iterative method for the registration of 3-D objects. Its originality stems from its mechanical basis: we study the motion of... View full abstract»

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  • 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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  • Qualitative estimations of range and motion using spatio-temporal textural images

    Publication Year: 1994, Page(s):736 - 738 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    In this paper we model the problem of structure from motion as the range estimation with known motion. First, we approximate the motion within a reasonable time interval as a 3D translation and thus some image transformations are applied to convert an arbitrary motion to a 1D translation. Then we analyse the epipolar plane image in the Fourier domain to avoid the feature extraction and corresponde... View full abstract»

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  • Color vision based methodology for grading lumber

    Publication Year: 1994, Page(s):787 - 790 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    In this paper we describe the outlines of a color vision solution for grading softwood lumber The proposed inspection principle is to recognize the sound wood regions early as this reduces the computational requirements at later stages. This is important because color increases the data volumes significantly over grey scale images. The computational solutions have turned out to be simpler than wit... View full abstract»

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  • Estimating gaze from a single view of a face

    Publication Year: 1994, Page(s):758 - 760 vol.1
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Current approaches to gaze tracking tend to be highly intrusive: the subject must either remain perfectly still, or wear cumbersome headgear to maintain a constant separation between the sensor and the eye. This paper describes a more flexible vision-based approach, which can estimate the direction of gaze from a single, monocular view of a face. The technique makes minimal assumptions about the s... View full abstract»

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  • Non rigid registration for building 3D anatomical atlases

    Publication Year: 1994, Page(s):576 - 578 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Presents a general scheme for the building of anatomical atlases. The authors propose to use specific and stable features, the “crest lines” or ridge lines which are automatically extracted from 3D images by differential geometry operators. The authors have developed nonrigid registration techniques and got encouraging results for the building of a first atlas of the crest lines of the... 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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  • Segmentation of visual motion by minimizing convex non-quadratic functionals

    Publication Year: 1994, Page(s):661 - 663 vol.1
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A minimization problem is proposed to combine smoothing of locally computed motion data (e.g. normal flow) with the detection of motion boundaries. The continuous formulation of the cost functional allows one to incorporate arbitrary continuity-equations which locally determine apparent motion, and a nonlinear smoothing term adapts to the magnitude of the flow-gradient or to its components diverge... 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 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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  • Motion and structure based image segmentation for object oriented time-varying sequences coding

    Publication Year: 1994, Page(s):733 - 735 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The paper presents an ascending approach to the construction of the spatio-temporal segmentation of time varying sequences. The particularity of the approach is to combine motion homogeneity of the segments with spatial fidelity of occlusion boundaries. The tracking process with the developed procedures of spatial and temporal adjustment allows a high quality reconstruction of the sequence frames ... View full abstract»

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  • Automatic measurement of the angle of squint by Hough-transformation and covariance-filtering

    Publication Year: 1994, Page(s):784 - 786 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Describes the image processing method for the automatisation of the measurement of squint using the first and fourth Purkinje reflex. This method is already in use in clinical practice in comparison to the standard method of the cover test. The new method, based on image processing, allows the exact and objective determination of the angle of squint. Children from the age of six months as well as ... 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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  • Matching images by comparing their gradient fields

    Publication Year: 1994, Page(s):572 - 575 vol.1
    Cited by:  Papers (36)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    We present a simple yet powerful method to perform point-to-point matching between two images. The method uses an evidence measure, whose value for a given displacement reflects both the similarity between two locations and the confidence in a correct match. The measure is based on the gradient fields of the images, and can be computed quickly and in parallel. Accumulating the evidence measure for... 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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