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A system for scanning and segmenting cursively handwritten words into basic strokes 3

A system for scanning and segmenting cursively handwritten w...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Privitera, C.M. Plamondon, R. Laboratoire Scribens Departement de Genie Electrique et de Genie Informatique Ecole Polytechnique de Montreal Case postale 6079 MontrealQCH3C3A7 Canada International Computer Science Institute 1947 Center St. BerkeleyCA94704-1105 United States

ISBN: (纸本)0818671289

This paper presents a segmentation method that partly mimics the cognitive-behavioral process used by human subjects to recover motororal information from the image of a handwritten word. The approach does not exploit any thinning procedure, but rather a different typology of information is manipulated concerning the curvature of the word contour. Starting from the maximum curvature points roughly corresponding to the beginning of a stroke, the algorithm scans the word, following the natural course of the line and attempts to repeat the same movement as executed by the writer during the generation of the word. At each maximum curvature point, the line is segmented and reconstructed by a smooth interpolation of the most interior points belonging to the line just covered. At the end of the scanning process, a temporal sequence of motor strokes is obtained which plausibly composes the original intended movement. © 1995 ieee.

关键词： image segmentation

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Directional mathematical morphology approach for line thinning and extraction of character strings from maps and line drawings 3

Directional mathematical morphology approach for line thinni...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Luo, Huizhu Agam, Gady Dinstein, Its'hak Electrical and Computer Engineering Department Ben Gurion University of Negev Beer Sheva84105 Israel

ISBN: (纸本)0818671289

The use of computer aided design requires line drawings and m p s to be digitized and stored in databases. The input of line drawings and nwps into data bases requires vectorization of lines, and recognition of symbols and characters. This paper addresses two aspects reluted to the input process. The first aspect is an autonwtic algorithm for the separation of character strings ,fona mps. The second aspect is an algorithm .for line thinning. The proposed algorithms are based on directional morphology operations. The character string extraction algorithm is independent of font style, size, and language and is suitable for a variety of nwp styles with straight or curved lines. The presented experimental results demonstrate very good performance of the algorithms even in cases where the character strings touch or intersect lines in the map. © 1995 ieee.

关键词： Mathematical morphology

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Efficient analysis of complex diagrams using constraint-based parsing 3

Efficient analysis of complex diagrams using constraint-base...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Futrelle, R.P. Nikolakis, N. Biological Knowledge Laboratory College of Computer Science Northeastern University 161 Cullinane Hall BostonMA02115 United States

ISBN: (纸本)0818671289

This paper describes substantial advances in the analysis (parsing) of diagrams using constraint grammars. The addition of set types to the grammar and spatial indexing of the data make it possible to efficiently parse real diagrams of substantial complexity. The system is probably the first to demonstrate efficient diagram parsing using grammars that easily be retargeted to other domains. The work assumes that the diagrams are available as a flat collection of graphics primitives: Lines, polygons, circles, Bezier curves and text. This is appropriate for future electronic documents or for vectorized diagrams converted from scanned images. The classes of diagrams that we have analyzed include x,y data graphs and genetic diagrams drawn from the biological literature, as well as finite state automata diagrams (states and arcs). As an example, parsing a four-part data graph composed of 133 primitives required 35 sec using Macintosh Common Lisp on a Macintosh Quadra 700. © 1995 ieee.

关键词： Graphic methods

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Interactive acquisition of thematic information of Chinese verbs for judicial verdict document understanding using templates, syntactic clues, and heuristics 3

Interactive acquisition of thematic information of Chinese v...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Lin, Koong H. C. Liu, Rey-Long Soo, Von-Wun Department of Computer Science National Tsing-Hua University Hsinchu30043 Taiwan

ISBN: (纸本)0818671289

The thematic knowledge can bridge the gap between semantic entities and syntactic constituents. In document understanding, the correctness and the efficiency could be improved ifthe thematic knowledge is available. In this paper, we propose a semi-automatic method to acquire thematic knowledge of Chinese verbs by exploiting syntactic clues. The syntactic clues, which may be collected by most existing syntactic processors, reduce the hypothesis space of the theta roles. The ambiguities may be further resolved by the evidencesfrom a trainer. A set of heuristics based on linguistic constraints are employed to guide the ambiguity resolution process. To acquire thematic information for verbs, the argument structures of the verbs must be extracted first. A template matching method is used to extract the argument structure of verbs. © 1995 ieee.

关键词： Syntactics

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Invariant handwritten Chinese character recognition using weighted ring-data matrix 3

Invariant handwritten Chinese character recognition using we...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Chiu, Hung-Pin Tseng, Din-Chang Cheng, Jen-Chieh Institute of Computer Science and Information Engineering National Central University Chung-Li Taiwan

ISBN: (纸本)0818671289

A location-,scale-,and orientation-invariant handwritten Chinese character recognition system is proposed. Five invariant features are employed in this study;the main feature is just invariant to rotation, thus a scale- and translation-invariant normalization process is needed to achieve all desired invariance. Four other features are derived from three primitives: 1-fork point, corner point, and multi-fork point. To reduce matching time, preclassification is employed. A fuzzy membership function is defined according to the weighted mean ringdata matrix, number of strokes, and number of connected components to match characters. A data set was constructed from 200 handwritten Chinese characters and comprising ten different samples of each character in arbitrary orientations. Experiments were conducted with the data set to evaluate the performance of the proposed preclassification and matching methods. The average recognition rate is about 90%;we conclude that the proposed system offers a simple solution to the complex problem of invariantly recognizing handwritten Chinese characters. © 1995 ieee.

关键词： Membership functions

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A line sweep thinning algorithm? 3

A line sweep thinning algorithm?

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Chang, Fu Cheng, Yung-Ping Pavlidis, Theo Shuai, Buey-Yuh Institute of Information Science Academia Sinica Taipei Taiwan Dept.of Computer Science Stony BrookNY11794-4400 United States

ISBN: (纸本)0818671289

In this article, we propose a new thinning algorithm based on line sweep procedures. A line sweep is a procars where the plane is divided into parallel slabs by lines passing through certain "events" and then items are processed according to an order of the slabs. Assuming that the contour of the object that are to be thinned have been approzimated by polygons, the "events" are then the vertices of the polygons and the line sweep algorithm looks for pairs of polygon sides that lie within each slab. Since the procedure is applied in both horizontal and vertical direction, possible conflicts may exist among the pairs of polygon sides. A subsequent effort is to resolve the conflicts according to a fav generic types into which they can be classified. After the conflict resolution, the object can be decomposed into the regions that can be represented by the skeletons computed from the pairs of polygon sides, and the regions that are the singular parts of the object. Both types of regions can be used as features for sub sequentpattern recognition operations. © 1995 ieee.

关键词： Character recognition

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Recursive morphological sieve method for searching pictorial point symbols on maps 3

Recursive morphological sieve method for searching pictorial...

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3rd International conference on Document Analysis and recognition, ICDAR 1995

作者： Shieh, J.S. Department of Computer Science Memorial University of Newfoundland St. John'sNFA1C5S7 Canada

ISBN: (纸本)0818671289

Point symbols on a map represent interesting and significant positional data, such as airports, ski areas and natural parks. Identification of point symbols and finding their positions are important for automatic map understanding. Point symbols on maps may partially overlap on each other. More often they are touched or connected by line symbols, and their background consists of colored and/or textured regions. In this situation, a straightforward morphological template matching method is not feasible. A new partial ordering method for aligning pictorial point symbols which is based on the relationship of K-tolerance covering and a new general method for searching pictorial point symbols on maps, the recursive morphological sieve method, are described. The main ideas of this new method include (1) finding the coverings of the kernels of a symbol instead of the symbol itself, (2) morphologically preprocessing.maps to form multi-level sieves, (3) using the sieves to screen out symbol kernels, and (4) renewing sieves during a recursive screening process. This method may also be used to recognize pictorial point symbols on other types of documental files. © 1995 ieee.

关键词： Textures

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An approach to recognition of human patterns in movement

An approach to recognition of human patterns in movement

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An International Meeting on Engineering in Medicine and Biology society,and conference of the Biomedical Engineering society of India

作者： A. Pazos A. Rivas-Feal Department of Computer Science Faculty of Informatics of La Coruña Group of Applications of Artificial Intelligence Spain

The system the authors propose here aims to establish an automatization of the data acquisition process from video sequences in sporting environments. All of this is devoted to perform an analysis of human movement in an affordable way. One has to take into account that if one is working with very narrow environments (e.g. sport movements and specifically cyclic movements), the main problem, that is shape recognition and interpretation from images, reduces the complexity and thus the analysis can be treated in an easier way. Under this condition, a database for the storage of graphic patterns aids the system in situations with a nonclear solution, and at the same time allows one to save the environmental conditions of the image sequence. These conditions can change a lot of times and can make the recognition process difficult. The authors have also used artificial neural networks for pattern association between patterns from the image, in some cases incomplete, and those stored in a database. This process will be preceded, of course, by filtering operations and typical techniques of image processing.for improving the features of each frame from the sequence to be recognized.

关键词： pattern recognition Humans image recognition image databases image storage Data acquisition Video sequences Performance analysis Shape image analysis

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An integrated facility for data acquisition and analysis of biomedical signals. Case studies on VEP, IVS

An integrated facility for data acquisition and analysis of ...

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An International Meeting on Engineering in Medicine and Biology society,and conference of the Biomedical Engineering society of India

作者： G.R. Kulkarni V. Udpikar Dept. of Phys. Poona Univ. Pune India

The variety of signal sources and the wide range of analytical techniques pose a serious problem in the integrated setup development for biomedical signal processing. In this paper we present an integrated, personal computer based setup useful in a variety of biomedical signal processing.applications. We also present interesting case studies from VEP, IVS analysis. At the heart of the setup is a PC-AT486 with analog-to-digital converter (12 bits, 100 KSPS), serial modem and powerful, interactive digital signal processing.(DSP) software FFT Lysis. The configuration is interfaced with the NICOLET COMPACT FOUR VEP recorder, and spike-train pre-amplifier. The DSP software on the PC-AT consists of biomedical signal processing.modules for digital filtering, template matching FFT analysis, wavelet analysis, basic image processing.and pattern synthesis. In addition to these the software consists of powerful statistical classification programs for principal component analysis (PCA).

关键词： Data acquisition Data analysis Signal analysis Biomedical signal processing Digital signal processing image analysis pattern analysis Principal component analysis Signal processing Microcomputers

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MEDIUM LEVEL SCENE REPRESENTATION USING A VLSI SMART HEXAGONAL SENSOR WITH MULTIRESOLUTION EDGE EXTRACTION CAPABILITY AND SCALE-SPACE INTEGRATION processing

MEDIUM LEVEL SCENE REPRESENTATION USING A VLSI SMART HEXAGON...

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1994 ieee computer-society conference on computer Vision and pattern recognition

作者： TREMBLAY, M SAVARD, M POUSSART, D UNIV LAVAL DEPT ELECT ENGNCOMP VISION & DIGITAL SYST LABQUEBEC CITY G1K 7P4QUEBECCANADA

ISBN: (纸本)0818658258

This paper presents a sensing approach where phototransduction, multi-resolution feature extraction, scale-space integration and edge tracking are performed on a mixed (digital-analog) VLSI architecture in order to generate medium-level scene description. The proposed system is mainly targeted for robot vision applications where feature description is preferred to a set of raw or raster 2D images and edge maps. The Multiport Access photo-Receptor (MAR) is a CMOS sensor and represents the main sensory part of this integrated image acquisition system. VLSI also provides means to integrate analog computing, digital controller and DSP co-processor modules which define a powerful sensory chip set for focal plane image processing. A current version of the MAR sensor which implements 256 × 256 pixels includes 16 analog spatial filters which simultaneously compute multiresolution edge maps. This unique 2D hexagonal smart sensor approach which performs up to 8.5 × 10⁹ arithmetic Op/sec during the acquisition/filtering phase and 25 × 10⁹ Logical Op/sec for scale-space integration allows high resolution image capability. It represents a significant improvement for passive sensory units in a compact assembly for computer vision applications.

关键词： image sensors

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