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Researchers such as Zhu  and Pizer & Damon [4, 9] have modified the definition of the medial axis in their work to make the axis more robust, but as a consequence have sacrificed some of these. In this chapter we discuss a medial axis computation technique for a discrete binary object based on the Voronoi diagram of a point sample obtained from its boundary.
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The method is developed for. and medial-axis-based shape features, which were then organized into vectors and assigned to the nearest pixels of corresponding shape parts to create feature images. How-ever, the shapes this representation can represent are restricted by the feature descriptors it uses.
For instance, all descriptors mentioned in  are for 2D closed contours. An intuitive way to implement the MAT is the so-called grassfire transformation. There are numerous methods for medial axis computation (see Ref.
for a survey of skeletal methods). In our approach, we apply a multi-scale method to reduce the sensitivity of medial axes to image noise and boundary details. A multi-scale representation of shape F is achieved by computing its evolved versions as F Cited by: Marcon J, Kopriva DA, Sherwin SJ, Peiro J et al.,Naturally curved quadrilateral mesh generation using an adaptive spectral element solver, 28th International Meshing Roundtable and User Forum, Publisher: arXiv We describe an adaptive version of a method for generating valid naturally curved quadrilateral meshes.
Description Robust and flexible multi-scale medial axis computation EPUB
The method uses a guiding field, derived from the concept of a cross field. The medial axis is a symmetry axis in the sense that each pair of associated boundaries is symmetric around the medial axis. The advantages of using the medial axis over contours are many: The medial axis represents the spatial arrangement of curves, the interior of objects, makes explicit the symmetry of a region, captures the continuity of an Cited by: However, medial axis is composed of planar (two dimensional) and linear (one dimensional) parts.
In order to compute such dimension-dependent decomposition of the medial axis, as well as pruning away hairy branches from the medial axis one requires some extra gadgets which we describe in the next by: 2.
/ot ot Other Titles in Applied Mathematics Society for Industrial and Applied Mathematics OT98 / Finite Difference Methods for Ordinary and Partial Differential Equations Steady-State and Time-Dependent Problems.
We're upgrading the ACM DL, and would like your input. Please sign up to review new features, functionality and page by: In this paper, we present an automatic method which can transfer geometric textures from one object to another, and can apply a manually designed geometric texture to a model.
Our method is based on geometry images as introduced by Gu et al. The key ideas in this method involve geometric texture extraction, boundary consistent texture synthesis, discretized orientation and scaling, and Cited by: Description; Chapters; Supplementary; Research in Computer and Robot Vision is directed toward researchers and graduate students in the field of computer vision.
A broad spectrum of recent research is presented including sensing and navigation for mobile robots, the extraction of lines, curves, surfaces, and skeletons from intensity images and range images, human motion, and feature extraction. The resulting medial axis appears largely invariant with respect to typical noise conditions in the discrete data.
The method is tested on various synthetic as well as real images. We also show an application of the approximate medial axis to the sizing field for triangular and tetrahedral meshing. Doctoral Dissertation Abstracts (M – Z) Following is a complete list of doctoral graduates of the Department of Computer Science, with their dissertation titles.
Graduates of other departments or schools, whose primary adviser was a member of the Department of Computer Science, are also listed. This thesis evaluates the suitability of Voronoi ball models (VBMs) as a multipurpose shape representation for applications in computer graphics, scientific visualization, and computer vision.
The effectiveness of VBMs is judged with respect to six key properties, namely stability, flexibility, accuracy, complexity, efficiency, and intuitiveness. These properties have a significant impact on Cited by: 2.
The proposed morphological spectrum is the multi-scale morphological shape description and analysis tools based on granulometry.
It is shown how the tasks of change detection and shape matching in images can be solved using a morphological image by: 9. A centroidal Voronoi tessellation is a Voronoi tessellation whose generating points are the centroids (centers of mass) of the corresponding Voronoi regions.
We give some applications of such tessellations to problems in image compression, quadrature, finite difference methods, distribution of resources, cellular biology, statistics, and the Cited by: The development of the method depending on a new wavelet function which is designed specifically for computing the medial axis of ribbon-like objects and it yields certain desirable properties that make the resulting object skeleton robust against variations in grey level, variation in slope of the edge, as well as independent of the width of.
He, Y., Chen, C.: Sparse coding for flexible, robust 3D facial-expression synthesis. IEEE Computer Graphics and Applications 32 (2), 76–88 () Google Scholar Autonomous vehicles are expected to play a key role in the future of urban transportation systems, as they offer potential for additional safety, increased productivity, greater accessibility, better road efﬁciency, and positive impact on the environment.
Research in autonomous systems has seen dramatic advances in recent years, due to the increases in available computing power and reduced Cited by: The general theme of MEDICON is "Research and Development of Technology for Sustainable Healthcare".
This decade is being characterized by the appearance and use of emergent technologies under development. This situation has produced a tremendous impact on.
Computer simulations are implemented in Matlab (Ra, The MathWorks, Inc.) and are based on an agent navigating in a simple 2D environment depicted in Figure location of the agent is specified using orthogonal allocentric coordinates and its direction of heading (clockwise from positive) environment contains two inner walls and four boundary by: The sensors have a flexible round active area of diameter mm to detect the applied force, with a two flexible lead wires to connect the sensor to the acquisition circuit.
A FSR exhibits a non-linear relation between the applied force and the sensor’s resistance. In addition, no direct relationship is provided in the sensor’s datasheet. Proc. SPIEMedical Imaging Image Processing, pg 1 (3 July ); doi: / The key idea is to segment a polygonal domain by using its medial axis and afterwards merge small parts in the segmentation.
Given an arbitrary polygon Q with n generators (i.e., line segments and reflex vertices in Q), we show that the time complexity of our algorithm is O(n 2 log 2 n) and the number of output rectangles covering Q is O(Kn.
For a three-dimensional polyhedral solid, the medial axis consists of quadric surfaces and degree-four algebraic space curves.
Details Robust and flexible multi-scale medial axis computation EPUB
Computing with high-degree curves and surfaces requires high numerical precision. Most previous methods attempt to avoid such computation by discretizing, or otherwise approximating, the medial axis.
Dongchen Liang and Giacomo Indiveri Robust State-Dependent Computation in Neuromorphic Electronic Systems, Biomedical Circuits and Systems Conference, (BioCAS),pdf E Covi, R George, J Frascaroli, S Brivio, C Mayr, H Mostafa, G Indiveri, S Spiga Spike-driven threshold-based learning with memristive synapses and neuromorphic.
ROC study of the effects of computer-aided interval change analysis on radiologists' characterization of breast masses in two-view serial mammograms.
Full text of "3 D Imaging, Analysis And Applications" See other formats. Full text of "Computer vision, ECCV 6th European Conference on Computer Vision, Dublin, Ireland, June July 1, proceedings" See other formats.
Using an adaptation of the Support Vector Regression method for multi-scale analysis, the proposed method provides a global, analytical expression for the reconstructed vector field through an efficient non-linear optimization. Experiments on artificial and real data show a statistically robust behavior of the proposed technique.
SPIE Digital Library Proceedings. Proc. SPIEMedical Imaging Computer-Aided Diagnosis, (30 August ); doi: /Publication: Nat Neurosci. Dec;17(12) PMID: | PDF. Authors: Brickman AM, Khan UA, Provenzano FA, Yeung LK, Suzuki W, Schroeter H, Wall M, Sloan RP, Small SA. Institution: Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University, New York, New York, USA.
Background/Purpose: The dentate gyrus (DG) is a region in the hippocampal .The medial axis community has long exploited the ubiquitous regularity of symmetry as a basis for the decomposition of a closed contour into medial parts.
However, today's recognition systems are faced with cluttered scenes and the assumption that a closed contour exists, i.e., that figure-ground segmentation has been solved, rendering much of.
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