Proceedings 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition

15-18 June 1992

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Displaying Results 1 - 25 of 160
  • Indexing function-based categories for generic recognition

    Publication Year: 1992, Page(s):795 - 797
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors report the implementation and evaluation of a function-based recognition system that takes an uninterrupted 3-D object shape as its input and reasons to determine if the object belongs to the superordinate category furniture, and if so, into which (sub)category it falls. The system has analyzed over 250 input objects, and the results largely agree with intuitive human interpretation of... View full abstract»

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  • Proceedings. 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (Cat. No.92CH3168-2)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (20 KB)
    Freely Available from IEEE
  • The scale space aspect graph

    Publication Year: 1992, Page(s):335 - 340
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Currently the aspect graph is computed under the assumption of perfect resolution in the viewpoint, the projected image, and the object shape. Visual detail is represented that an observer might never see in practice. By introducing scale into this framework, a mechanism is provided for selecting levels of detail that are large enough to merit explicit representation, effectively allowing control ... View full abstract»

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  • Saliencies and symmetries: toward 3D object recognition from large model databases

    Publication Year: 1992, Page(s):322 - 327
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    The construction of interpretation tables from database models is introduced, and a recognition procedure using scene feature groups is discussed. Techniques for extraction of feature group equivalence classes and computation of feature group saliency are discussed. Two methods to reduce the computational burdens associated with a large model database are proposed and tested on polyhedral objects.... View full abstract»

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  • Recovering shape by purposive viewpoint adjustment

    Publication Year: 1992, Page(s):16 - 22
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An approach for recovering surface shape from the occluding contour using an active (i.e., moving) observer is presented. It is based on a relationship between the geometries of a surface in a scene and its occluding contour: If the viewing direction of the observer is along a principal direction for a surface point whose projection is on the contour, surface shape (i.e., curvature) at the surface... View full abstract»

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  • Depth from defocus and rapid autofocusing: a practical approach

    Publication Year: 1992, Page(s):773 - 776
    Cited by:  Papers (20)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A method for determining depth (range) from image defocus and rapid autofocusing of a camera named DFD1F, is presented. It requires only two images in theory, but three images in the present implementation. DFD1F is based on computing only one-dimensional Fourier coefficients as opposed to two-dimensional Fourier coefficients for a related prior method, thus providing not only computational advant... View full abstract»

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  • Morphological structuring function decomposition

    Publication Year: 1992, Page(s):566 - 571
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The author attempts to solve the structuring function decomposition problem where the structuring function refers to the gray scale structuring element. A morphologically realizable representation for the structuring function that reduces the structuring function decomposition into a series of binary structuring element decompositions is presented. Recursive algorithms that are pipelinable for eff... View full abstract»

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  • Real-time smooth pursuit tracking for a moving binocular robot

    Publication Year: 1992, Page(s):23 - 28
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The problem of a moving robot tracking a moving object with its cameras, without requiring the ability to recognize the target to distinguish it from distracting surroundings, is examined. A novel aspect of the approach taken is the use of controlled camera movements to simplify the visual processing necessary to keep the cameras locked on the target. A gaze-holding system implemented on a robot's... View full abstract»

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  • Verifying and combining different visual cues into a 3-D model

    Publication Year: 1992, Page(s):777 - 780
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The authors attempt to combine results from different vision cues such as contour, motion and shading in an image sequence to obtain as complete a 3-D model as possible. Two problems must be solved. First, different features may appear to be the same image data. They should be classified so that different methods can be applied precisely. Second, output from different approaches may supplement, or... View full abstract»

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  • Nonlinear multiscale filtering using mathematical morphology

    Publication Year: 1992, Page(s):572 - 578
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A multiscale filtering scheme based on the three Matheron axioms for morphological openings is developed. It is shown that opening a signal with a gray scale operator does not introduce additional zero-crossings as one moves to coarser scales. Within this framework, the problem of choosing an appropriate structuring element is studied. In order to obtain a measure of the performance of different s... View full abstract»

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  • Active photometric stereo

    Publication Year: 1992, Page(s):29 - 34
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An active vision technique for determining the absolute depth of surfaces is described. The algorithm assumes a very general model for the reflectance properties of the surface, and is valid for most of the shading models commonly used in computer vision work. The algorithm relies on the controlled motion of a point light source, which is not at infinity but relatively close to the surface and to ... View full abstract»

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  • Recognizing 3D objects from 2D images: an error analysis

    Publication Year: 1992, Page(s):316 - 321
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Object recognition systems that use a small number of pairings of data and model features to compute the 3D transformation from model to sensor coordinates are considered. The effects of 2D sensor uncertainty on such computations are examined. The uncertainty in transformation parameters is bounded, and the effect of this uncertainty on false positive recognition rates is analyzed View full abstract»

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  • Robust statistics in shape fitting

    Publication Year: 1992, Page(s):540 - 546
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The concept of robustness in statistics is examined. Starting from the concepts of the breakdown point and equivariance properties of an estimator, the desired equivariance properties for shape fitting are defined, and high breakdown point methods with these properties are found View full abstract»

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  • Computing occlusion-free viewpoints

    Publication Year: 1992, Page(s):802 - 807
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Methods for computing the locus of all viewpoints from which features on known polyhedral objects can be viewed in their entirety without being occluded by anything in the environment are presented. Convex and concave polyhedra with or without holes and the viewing model of perspective projection are used in this work. Based on properties of the occlusion-free and occluded loci of viewpoints, two ... View full abstract»

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  • Computational ground and airborne localization over rough terrain

    Publication Year: 1992, Page(s):781 - 783
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An approach for autonomous localization of ground vehicles on natural terrain is proposed. The localization problem is solved using measurements including attitude, heading, and distances to specific environmental points. The algorithm utilizes random acquisition of distance measurements to prune the possible location(s) of the viewer. The approach is also applicable to airborne localization View full abstract»

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  • Optimal nonlinear pattern restoration from noisy binary figures

    Publication Year: 1992, Page(s):579 - 584
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A mathematical framework for the solution of statistical inference problems on a class of random sets is proposed. It is based on a new definition of expected pattern. The least-mean-difference estimator (restoration filter) is proved, under certain conditions, to be equivalent to the minimization of the measure of size (area) of the set-difference between the original pattern and the expected pat... View full abstract»

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  • Correcting chromatic aberrations using image warping

    Publication Year: 1992, Page(s):684 - 687
    Cited by:  Papers (10)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The use of image warping to reduce the impact of chromatic aberration in vision applications is addressed. The warp is determined using edge displacements which are fit with cubic splines. An image reconstruction algorithm is used for nonlinear resampling. The main contribution of this work is to analyze the quality of the warping approach by comparing it with active lens control. Test results for... View full abstract»

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  • Motion trajectories

    Publication Year: 1992, Page(s):839 - 841
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A simple algorithm for selecting and linking interesting flow vectors across a sequence of frames for computing motion trajectories is presented. Tokens that have both interesting pixel gray values in the spatial domain and in the optical flow field in the temporal domain are tracked. This AND operation effectively removes some redundant trajectories. Due to errors introduced during the computatio... View full abstract»

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  • Visual motion analysis under interceptive behavior

    Publication Year: 1992, Page(s):148 - 153
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The development of the visual processes that would be needed by a mobile robot system for visually intercepting a moving target is considered. Many relevant active visual processes are proposed that provide robust input for qualitative motion control strategies. The processes for detecting independent motion and for monitoring progress toward the moving target are summarized View full abstract»

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  • 3-D landmark recognition from range images

    Publication Year: 1992, Page(s):360 - 365
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Progress in building and recognizing models of objects for an autonomous vehicle for on-road and cross-country navigation is reported. The object models are stored in a map and are used as landmarks for estimating vehicle position. The landmarks can be used as intermediate control points at which the vehicle must take some prescribed action in the case of a complex mission. Robust object tracking ... View full abstract»

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  • Recovering the scaling function of a SHGC from a single perspective view

    Publication Year: 1992, Page(s):36 - 41
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    An algorithm for recovering the scaling function of a straight homogeneous generalized cylinder (SHGC) from an image contour is presented. Both location and reference cross section are supposed known. Perspective view assumption and geometric properties of SHGCs are used to derive the method. No additional constraints have been imposed on the object shape. The method has been tested on synthetic i... View full abstract»

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  • Detecting parameterized curve segments using MDL and the Hough transform

    Publication Year: 1992, Page(s):547 - 552
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A method for detecting curve segments in a digital image is described. The method takes as input a set of edges, and produces as output the number of and parameters for the segments. The method is robust, requiring no thresholds. In place of thresholds, a model class must be provided. Using the information-theoretic minimum description length (MDL) principle, it evaluates each model in the model c... View full abstract»

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  • The alignment of objects with smooth surfaces: error analysis of the curvature method

    Publication Year: 1992, Page(s):341 - 346
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The recognition of objects with smooth bounding surfaces from their contour images is addressed. In particular, the curvature method is applied to ellipsoidal objects and the error for different rotations of the objects is computed analytically. It is seen that the error depends on the exact shape of the ellipsoid (namely, the relative lengths of its axes), and it increases as the ellipsoid become... View full abstract»

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  • Shape from periodic texture using the spectrogram

    Publication Year: 1992, Page(s):284 - 289
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    It is shown how local spatial image frequency is related to the surface normal of a textured surface. It is found that the Fourier power spectra of any two similarly textured patches on a plane are approximately related to each other by an affine transformation. The transformation parameters are a function of the plane's surface normal. This relationship is used as the basis of an algorithm for fi... View full abstract»

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  • A new 3-D surface measurement system using a structured light

    Publication Year: 1992, Page(s):784 - 786
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors present a 3-D measurement method using a projected grid that permits an optimal geometrical exploitation of the calculated 3-D data. They propose a reliable method for solving the correspondence that establishes the link between the imaged grid and the original grid curve per curve without any ambiguity. The imaged grid is extracted by an efficient method that describes the distorted g... View full abstract»

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