Filters








9,240 Hits in 11.4 sec

Three-dimensional object recognition

Paul J. Besl, Ramesh C. Jain
1985 ACM Computing Surveys  
A general-purpose computer vision system must be capable of recognizing threedimensional (3-D) objects.  ...  This paper proposes a precise definition of the 3-D object recognition problem, discusses basic concepts associated with this problem, and reviews the relevant literature.  ...  Besl and R. C. Jain library. They employ 3-D models constructed by the Martin and Aggarwal [ 19831 approach, but any 3-D model reconstruction method could be used in practice.  ... 
doi:10.1145/4078.4081 fatcat:fan2tkkvq5gg5h5crwvr27puiy

Geometric invariants and object recognition

Isaac Weiss
1993 International Journal of Computer Vision  
I In this paper we discuss the role of the general invariance concept in object recognition, and review the classical and recent literature on projective invariance.  ...  To match the two images, common methods thus need to find the correct viewpoint, a difficult problem that can involve search in a large parameter space of all possible points of view and/or finding point  ...  We can measure it on the image and use it for indexing of the 3-D object. The two lamp shades of Fig. 14 were clearly distinguished by this method.  ... 
doi:10.1007/bf01539536 fatcat:tve6uhevdndmlg72zo3tweajje

Bayesian pot-assembly from fragments as problems in perceptual-grouping and geometric-learning

2002 Object recognition supported by user interaction for service robots  
The performance measure can also be aposteriori probability, and many other types of information can be included, e.g., pot wall thickness, surface color, patterns on the surface, etc.  ...  This can also be viewed as the problem of learning a geometric object from an unorganized set of free-form fragments of the object and of clutter, or as a problem of perceptual grouping.  ...  s 4 t v u 3 D e w E 3 x F s y © s 8 s DE 3 5 F s U © s 8 S w 8 (6) Since the surface model depends on the axis, the resulting objective function is highly non-linear.  ... 
doi:10.1109/icpr.2002.1047853 fatcat:37xyyqxzo5gbpnh4yptakw5qnq

OBJECTIVE TEMPERATURE ESTIMATES FROM MEAN CIRCULATION PATTERNS1

DONALD E. MARTIN, WALTER G. LEIGHT
1949 Monthly Weather Review  
Klein, “An Objective Method of Forecasting Five-day Precipitation for the Tennessee Valley,” Research Paper No. 29, U. S. Weather Bureau, Wash- ington, 1949. 3. J. Namias and P. F.  ...  REVISION OF METHOD It has been pointed out that the measurement of curvature is cumbersome and does not lend itself to con- version for use with 5-day material.  ... 
doi:10.1175/1520-0493(1949)077<0275:otefmc>2.0.co;2 fatcat:vbf623j3gndzpdcu4qd44srt2i

Part description and segmentation using contour, surface, and volumetric primitives

Alok Gupta, Ruzena K. Bajcsy, Bernd Girod
1990 Sensing and Reconstruction of Three-Dimensional Objects and Scenes  
We propose a paradigm for part description and segmentation by integration of contour, surface, and volumetric primitives.  ...  We propose a paradigm for part description and segmentation by integration of contour, surface, and volumetric primitives.  ...  Consider a depth map of an arbitrary scene. The initial model is an ellipsoid in the right position, orientation and of the right size to cover all of the 3-D points.  ... 
doi:10.1117/12.20020 fatcat:eanenwy3izdwjiij2rfucyaqhe

Modeling deformable shell-like objects grasped by a robot hand

Jiang Tian, Yan-Bin Jia
2009 2009 IEEE International Conference on Robotics and Automation  
Classical nonlinear theory of thin shells [21, pp. 186-194] is generalized to shells with arbitrary parametric middle surfaces, using a method introduced in our earlier work [13] .  ...  type of objects.  ...  To make the theory applicable to an arbitrary parametric middle surface, we apply the technique in [13] to rewrite strains and shears in terms of geometric invariants.  ... 
doi:10.1109/robot.2009.5152736 dblp:conf/icra/TianJ09 fatcat:twz63n7r6zgoze74arr6frb43u

Path planning for deformable linear objects

M. Moll, L.E. Kavraki
2006 IEEE Transactions on robotics  
We introduce a method for efficiently computing stable configurations of a wire subject to manipulation constraints. These configurations correspond to minimal-energy curves.  ...  We present a new approach to path planning for deformable linear (one-dimensional) objects such as flexible wires.  ...  Joe Warren and Prof. Leo Guibas for useful discussions on minimal-energy curves.  ... 
doi:10.1109/tro.2006.878933 fatcat:xoew4y324nbwbbtw64b7jbvjv4

On the bending algorithms for soft objects in flows

Achim Guckenberger, Marcel P. Schraml, Paul G. Chen, Marc Leonetti, Stephan Gekle
2016 Computer Physics Communications  
We start by comparing the numerically obtained mean curvature, the Laplace-Beltrami operator of the mean curvature and finally the surface force density to analytical results for the discocyte resting  ...  All are based on the same physical model (due to Canham and Helfrich) and start from a surface discretization with flat triangles.  ...  Moreover, Method D is based on a kernel of the heat equation, Method E fits some parabola onto the surface components, and Method S uses a subdivision scheme.  ... 
doi:10.1016/j.cpc.2016.04.018 fatcat:z4e6y2b3nbh6vgassnk4sj6wve

Invariant surface characteristics for 3D object recognition in range images

Paul J. Besl, Ramesh C. Jain
1986 Computer Vision Graphics and Image Processing  
The signs of these surface curvatures are used to classify range image regions into one of eight basic viewpoint-independent surface types.  ...  Meun curvature and Guussian curvuture are the fundamental second-order surface characteristics that possess desirable invariance properties and represent extrinsic and intrinsic surface geometry respectively  ...  We are indebted to Professor Mario Micallef for interesting and informative discussions on the equations of prescribed mean curvature and prescribed Gaussian curvature and for several pointers to the mathematical  ... 
doi:10.1016/0734-189x(86)90220-3 fatcat:gd2qtbwdhrhv7gac63ejoqf7aq

Invariant surface characteristics for 3-D object recognition in range images

Paul J Besl, Ramesh C Jain
1985 Computer Vision Graphics and Image Processing  
The signs of these surface curvatures are used to classify range image regions into one of eight basic viewpoint-independent surface types.  ...  Meun curvature and Guussian curvuture are the fundamental second-order surface characteristics that possess desirable invariance properties and represent extrinsic and intrinsic surface geometry respectively  ...  We are indebted to Professor Mario Micallef for interesting and informative discussions on the equations of prescribed mean curvature and prescribed Gaussian curvature and for several pointers to the mathematical  ... 
doi:10.1016/0734-189x(85)90049-0 fatcat:lwqabh2ssnbkxoap6icrwxtyzq

A Review of Geometry Recovery from a Single Image Focusing on Curved Object Reconstruction [chapter]

Martin R. Oswald, Eno Töppe, Claudia Nieuwenhuis, Daniel Cremers
2012 Mathematics and Visualization  
We classify the approaches according to their reconstruction objective and compare them based on a variety of important criteria.  ...  Finally, we show experimental comparisons for five curved object reconstruction approaches.  ...  Further, we are grateful to Mukta Prasad and co-authors for providing test data and results of their single view reconstruction method.  ... 
doi:10.1007/978-3-642-34141-0_16 fatcat:mgqtloxtb5ddblwan75utz275i

Generic object recognition using multiple representations

S Das
1996 Image and Vision Computing  
This paper is concerned with the derivation of hierarchical CAD models having multiple representations -concave/convex edges and straight homogeneous generalized cylinder -and their use for generic object  ...  Multiple representations, on the other hand, allow different matching strategies to be applied for the same object, or even for different parts of the same object.  ...  Thus, given the original and the diffused curves in parametric form and hence their respective curvatures and torsions according to Eqs. (7) and (8), an iterative deformation of the original curve in steps  ... 
doi:10.1016/0262-8856(95)01064-5 fatcat:atte6zqehvf2jfdivgmm54if5e

Generic object recognition using multiple representations

Subhodev Das, Bir Bhanu, Chih-Cheng Ho
1996 Image and Vision Computing  
This paper is concerned with the derivation of hierarchical CAD models having multiple representations -concave/convex edges and straight homogeneous generalized cylinder -and their use for generic object  ...  Multiple representations, on the other hand, allow different matching strategies to be applied for the same object, or even for different parts of the same object.  ...  Thus, given the original and the diffused curves in parametric form and hence their respective curvatures and torsions according to Eqs. (7) and (8), an iterative deformation of the original curve in steps  ... 
doi:10.1016/0262-8856(96)89798-8 fatcat:m56ordb55jbnrhmakfic72wz5q

On Computing Mapping of 3D Objects

Xin Li, S. S. Iyengar
2014 ACM Computing Surveys  
Different mapping algorithms are discussed and compared according to their formulations of objective functions, constraints, and optimization strategies.  ...  We review the computation of 3D geometric data mapping, which establishes one-to-one correspondence between or among spatial/spatiotemporal objects.  ...  The step-size λ k is determined by the strong Wolfe conditions [Moré and Thuente 1994] . The limitedmemory version of BFGS method, LBFGS, is a practical variant of BFGS.  ... 
doi:10.1145/2668020 fatcat:rcwzp5d4azb7xkaquyfc3l3reu

Haptic Simulation, Perception and Manipulation of Deformable Objects [article]

Nadia Magnenat-Thalmann, Pascal Volino, Ugo Bonanni, Ian R. Summers, A. C. Brady, J. Qu, D. Allerkamp, M. Fontana, F. Tarri, F. Salsedo, Massimo Bergamasco
2007 Eurographics State of the Art Reports  
design of novel force feedback systems, innovative concepts for curvature simulation and control algorithms for accuracy improvement.  ...  This tutorial addresses haptic simulation, perception and manipulation of complex deformable objects in virtual environments (VE).  ...  The first 3 DoFs are actuated in order to exert forces of arbitrary orientation at the fingertip, whereas the last 3 DoFs are passive and are realized by a gimbal.  ... 
doi:10.2312/egt.20071060 fatcat:2swapys4kjholfxjqdgjdbpdam
« Previous Showing results 1 — 15 out of 9,240 results