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Computers, IEEE Transactions on

Issue 9 • Date Sept. 1971

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Displaying Results 1 - 25 of 35
  • IEEE Transactions on Computers - Table of contents

    Publication Year: 1971, Page(s):c1 - 1137
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    Freely Available from IEEE
  • IEEE Computer Society

    Publication Year: 1971, Page(s): c2
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    Freely Available from IEEE
  • Preface

    Publication Year: 1971, Page(s):965 - 966
    Cited by:  Papers (3)
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    Freely Available from IEEE
  • The Reliability of Linear Feature Extractors

    Publication Year: 1971, Page(s):967 - 971
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    This paper introduces the concepts of capacity and reliability of a linear feature extractor. The relationship between the capacity introduced here and the channel capacity in information theory is discussed in some detail. The reliability is associated with the least favorable distributions and gives us a measure of the effectiveness for the worst possible case. It is of particular importance in ... View full abstract»

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  • Real-Time Recognition of Spoken Words

    Publication Year: 1971, Page(s):972 - 978
    Cited by:  Papers (18)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1840 KB)

    First a survey is given of a number of published vowel and word recognition systems. Then a new real-time word recognition system is described that uses only a small computer (8K memory) and a few analog peripherals. The essentials of the procedure are as follows. During the pronunciation of a word, a spectral analysis is carried out by a bank of 17 1/3-octave bandpass filters. The outputs of the ... View full abstract»

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  • Two Statistical Feature Evaluation Techniques Applied to Speaker Identification

    Publication Year: 1971, Page(s):979 - 987
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1824 KB)

    The problem of identifying people based solely upon samples of their speech is viewed as a statistical pattern classification problem, emphasizing the portion of the process in which an informative, concise set of features is extracted from the speech signal. This work takes into account both the limited amount of data available in a real application and the statistical dependence among the variou... View full abstract»

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  • Finding Events in a Sea of Bubbles

    Publication Year: 1971, Page(s):988 - 995
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2560 KB)

    DAPR is a digital automatic pattern recognition system, designed to find and measure events in bubble chamber film without manual intervention. It is able to measure film which has come directly from the photographic development process, and to produce on magnetic tape a digital abstraction of the information contained in the film, from which a subsequent selection of desired events takes place by... View full abstract»

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  • Global Transformations in Pattern Recognition of Bubble Chamber Photographs

    Publication Year: 1971, Page(s):995 - 1001
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    In this paper we present some new ideas on pattern recognition of bubble chamber photographs. We have found global transformations that reduce circular tracks to a point in a two-dimensional angle-curvature space. The performance of this tracking method on a sample of bubble chamber events is presented and planned improvements are discussed. View full abstract»

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  • The Special Features of POLLY: How They Are Used for Automatic Scanning

    Publication Year: 1971, Page(s):1002 - 1006
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    POLLY is a special-purpose bubble chamber film-measuring device in which small regions of the film are scanned automatically, the regions being under computer control. With some help from manual interaction facilities incorporated in the device, certain patterns of interest in high-energy physics are detected, identified, and located. View full abstract»

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  • Feature Extraction by Golay Hexagonal Pattern Transforms

    Publication Year: 1971, Page(s):1007 - 1014
    Cited by:  Papers (18)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4160 KB)

    Golay hexagonal pattern transforms are position independent local operators for use in transforming or altering binary images. The hexagonal tessellation is preferred because it removes the connectivity ambiguity present in the square or checkerboard tessellation. Golay transforms also may be applied to multilevel or "gray" images by encoding such images as a registered stack of binary image plane... View full abstract»

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  • Computer Analysis of Chromosome Patterns: Feature Encoding for Flexible Decision Making

    Publication Year: 1971, Page(s):1014 - 1022
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    Experimental pattern recognition techniques for processing chromosome slides with a computer are described. The purpose of the computer program is twofold: to illuminate the basic mechanisms by which a human recognizes an object, such as a chromosome, and distinguishes it from other entities; and the employment of these mechanisms is an automatic and precise extraction of chromosome features. View full abstract»

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  • A Comparison of Seven Techniques for Choosing Subsets of Pattern Recognition Properties

    Publication Year: 1971, Page(s):1023 - 1031
    Cited by:  Papers (40)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1848 KB)

    The only guaranteed technique for choosing the best subset of N properties from a set of M is to try all (MN) possible combinations. This is computationally impractical for sets of even moderate size, so heuristic techniques are required. This paper presents seven techniques for choosing good subsets of properties and compares their performance on a nine-class vectorcardiogram classification probl... View full abstract»

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  • A Survey of Preprocessing and Feature Extraction Techniques for Radiographic Images

    Publication Year: 1971, Page(s):1032 - 1044
    Cited by:  Papers (39)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (13088 KB)

    Feature extraction is one of the more difficult steps in image pattern recognition. Some sources of difficulty are the presence of irrelevant information and the relativity of a feature set to a particular application. Several preprocessing techniques for enhancing selected features and removing irrelevant data are described and compared. The techniques include gray level distribution linearizatio... View full abstract»

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  • Multidimensional Rotations in Feature Selection

    Publication Year: 1971, Page(s):1045 - 1051
    Cited by:  Papers (41)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3576 KB)

    An important aspect in mathematical pattern recognition is the usually noninvertible transformation from the pattern space to a reduced dimensionality feature space that allows a classification process to be implemented on a reasonable number of features. Such feature-selecting transformations range from simple coordinate stretching and shrinking to highly complex nonlinear extraction algorithms. ... View full abstract»

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  • Redundancy in Feature Extraction

    Publication Year: 1971, Page(s):1051 - 1054
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Given two random variables X and Y, a definition is offered that gives a condition for Y to be redundant with respect to X. It is shown that if such redundancy exists, then observations on Y, i.e., pattern vector elements related to Y, can be eliminated without increasing the classification error. A test for redundancy is developed and applied to the problem of preprocessing pattern vectors to eli... View full abstract»

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  • Theoretical Comparison of a Class of Feature Selection Criteria in Pattern Recognition

    Publication Year: 1971, Page(s):1054 - 1056
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The distance measures and the information functions for feature selection are compared. The comparison is based on the available tight upper and lower bounds of the probability of misrecognition, the rates of change of such probability, the effectiveness of a feature subset, and the computational complexity. View full abstract»

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  • Speaker Adaptation in a Limited Speech Recognition System

    Publication Year: 1971, Page(s):1057 - 1063
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1584 KB)

    This study examines the feasibility and limitations of speaker adaptation in improving the performance of a fixed (speaker-independent) automatic speech recognition system. A fixed vocabulary of 55 [ƏCVd] syllables is used in the recognition system, where C is 1 of 11 stops and fricatives, and V is 1 of 5 tense vowels. The results of the experiment on speaker adaptation, performed with 6 male... View full abstract»

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  • Feature Extraction in an Optical Character Recognition Machine

    Publication Year: 1971, Page(s):1063 - 1067
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2448 KB)

    A feature extraction technique for the next generation of optical character readers must be able to rapidly generate a quantity of discriminant functions using a minimum of equipment. The procedure described in this note generates a series of reference patterns for two-class discrimination and a feature ordering tree which may also be used to decode the sample class. Special hardware is used to pr... View full abstract»

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  • A Character Recognition Application of an Iterative Procedure for Feature Selection

    Publication Year: 1971, Page(s):1067 - 1075
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2832 KB)

    A simple yet powerful technique for selecting features to be used in a pattern recognition system has been devised and applied to an eight-class character recognition problem using a set of 19 000 typed character samples as a data base. High-order joint probabilities have been directly estimated from the data base, thus making it possible to take into account in the feature selection process the e... View full abstract»

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  • Some Studies in the Interactive Design of Character Recognition Systems

    Publication Year: 1971, Page(s):1075 - 1086
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2856 KB)

    A project to develop an effective tool for the interactive design of optical character recognition systems is described. The initial design system and several techniques and experiments to improve the system are also reported. Results of an experiment to design a recognition system for typewritten characters are included. The recognition logic required 11.3 man-hours to design and recognized over ... View full abstract»

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  • Use of the Multipole Expansion to Extract Significant Features of the Surface Electrocardiogram

    Publication Year: 1971, Page(s):1086 - 1089
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    Electrical activity associated with excitation and recovery of heart muscle is manifest as a time-varying potential distribution on the surface of the body. The surface electrocardiogram may be represented by a multipole expansion. The multipole terms can be derived from the surface potentials, and in turn are related to the cardiac sources. Studies indicate that a substantial portion of the infor... View full abstract»

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  • Automatic Ship Photo Interpretation by the Method of Moments

    Publication Year: 1971, Page(s):1089 - 1095
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1528 KB)

    The results of a study undertaken to determine the feasibility of automatic interpretation of ship photographs using the spatial moments of the image as features to characterize the image are reported. The photo interpretation consisted of estimating the location, orientation, dimensions, and heading of the ship. The study used simulated ship images in which the outline of the ship was randomly fi... View full abstract»

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  • Pattern Recognition Signal Processing for Mechanical Diagnostics Signature Analysis

    Publication Year: 1971, Page(s):1095 - 1100
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    Signature analysis of small, complex, cyclic mechanisms is discussed. An envelope preprocessor for isolating signal events relating to mechanical impacts is developed. A recognition system based on second-order (normal) statistics is used and the use of statistical procedures for signature intepretation is presented. Experimental evidence is presented to support the validity of this approach to me... View full abstract»

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  • A Direct Method of Nonparametric Measurement Selection

    Publication Year: 1971, Page(s):1100 - 1103
    Cited by:  Papers (86)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2120 KB)

    A direct method of measurement selection is proposed to determine the best subset of d measurements out of a set of D total measurements. The measurement subset evaluation procedure directly employs a nonparametric estimate of the probability of error given a finite design sample set. A suboptimum measurement subset search procedure is employed to reduce the number of subsets to be evaluated. Teh ... View full abstract»

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  • Techniques for Efficient Encoding of Features in Pattern Recognition

    Publication Year: 1971, Page(s):1104 - 1106
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Two techniques are described for efficient encoding of features in pattern recognition. It is shown that the number of binary digits needed to represent patterns can be greatly reduced using efficient feature encoding. Four-thousand utterances based on a 40-word vocabulary are used to evaluate the techniques. View full abstract»

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Aims & Scope

The IEEE Transactions on Computers is a monthly publication with a wide distribution to researchers, developers, technical managers, and educators in the computer field.

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Meet Our Editors

Editor-in-Chief
Paolo Montuschi
Politecnico di Torino
Dipartimento di Automatica e Informatica
Corso Duca degli Abruzzi 24 
10129 Torino - Italy
e-mail: pmo@computer.org