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IEEE Transactions on Computers

Issue 4 • Date April 1975

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  • IEEE Transactions on Computers - Table of contents

    Publication Year: 1975, Page(s): c1
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  • IEEE Computer Society

    Publication Year: 1975, Page(s): c2
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  • Introduction to the Special Issue on Optical Computing

    Publication Year: 1975, Page(s):337 - 339
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2792 KB)

    IN introducing what some may consider an unusual special issue, it is appropriate to recall that at the 1967 Fall Joint Computer Conference, the name of this journal was changed from IEEE TRANSACTIONS ON ELECTRONIC COMPUTERS to IEEE TRANSACTIONS ON COMPUTERS. This Special Issue on Optical Computing aptly reflects the broad aspects of computing for which this journal was intended. View full abstract»

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  • An Optical-Digital Computer for Parallel Processing of Images

    Publication Year: 1975, Page(s):340 - 347
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5992 KB)

    An optical-digital computer (ODC) that enables parallel processing of images is discussed. A number of optical and analog electronic preprocessing operations are described. These include the use of the texture variance to separate objects in an image on the basis of texture, application of autocorrelation techniques to find hidden periodicities in images, masking on the basis of color, Fourier ana... View full abstract»

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  • An Optical/Digital Processor: Hardware and Applications

    Publication Year: 1975, Page(s):348 - 358
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10584 KB)

    A real-time two-dimensional hybrid processor consisting of a coherent optical system, an optical/digital interface, and a PDP-11/15 control minicomputer is described. The input electrical-to-optical transducer is an electron-beam addressed potassium dideuterium phosphate (KD2PO4) light valve. The requirements and hardware for the output optical-to-digital interface, which is ... View full abstract»

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  • A Hybrid Optical Computer Processing Technique for Fingerprint Identification

    Publication Year: 1975, Page(s):358 - 369
    Cited by:  Papers (3)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5024 KB)

    An automated procedure involving both optical and computer processing steps is being developed as a means for easing the growing burden associated with manual preparation and manual searching of ten print fingerprint card files. A description of this technique is presented along with results recently obtained during a monitored test using a 10 000 fingerprint card library. View full abstract»

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  • Solid-State Area Scanning Arrays as Interface Devices Between Optical and Digital Computing Systems–A Simulation Study

    Publication Year: 1975, Page(s):370 - 380
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11400 KB)

    This paper describes how, in spite of occasional performance limitations generally due to process defects, large-area solid-state image sensors can be applied to scan pictorial data. First, it is estimated to what extent the direct imaging of pictorial matter onto a defective area-scanning device for acceptable scanning quality is possible. A novel concept is then proposed in which the optically g... View full abstract»

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  • Two Reconstruction Methods for Microwave Imaging of Buried Dielectric Anomalies

    Publication Year: 1975, Page(s):381 - 390
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2896 KB)

    Microwave imaging of anomalies, such as voids or discontinuities, in optically opaque regions is described. Images were reconstructed with two techniques. The experimental technique utilized laser light for reconstructions from detour phase holograms that encoded data measured in the region of Fresnel diffraction. Examples of images are presented for smooth and rough interfaces. The numerical reco... View full abstract»

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  • Nonredundant Point Distribution for Coded Aperture Imaging with Application to Three-Dimensional On-Line X-Ray Information Retrieving

    Publication Year: 1975, Page(s):391 - 394
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3128 KB)

    Conventional methods of displaying three-dimensional information in X-ray diagnostics like tomography or tomosynthesis are not capable of imaging fast moving objects because of the time-sequential recording process. To overcome this difficulty the method of coded aperture imaging using nonredundant point distributions is applied to X-ray imaging. The object coded by an array of X-ray sources is de... View full abstract»

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  • New Experiments and Analysis in Bragg-Diffraction Imaging

    Publication Year: 1975, Page(s):395 - 401
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6488 KB)

    System performance is substantially enhanced by using good attenuators in the system and employing a pulsing mode of operation. Spurious image elements, due to multiple reflections of the ultrasound in the acoustic cell and due to echoes from elements in the system which are not part of the object plane being imaged, can be eliminated in this fashion. In addition, depth discrimination can be subst... View full abstract»

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  • Thermoplastic Holographic Recording of Binary Patterns in PLZT Line Composer

    Publication Year: 1975, Page(s):402 - 406
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4424 KB)

    Binary patterns electrically set into a 12 element PLZT line composer have been recorded on a thermoplastic-photoconductor recording medium as Fourier transform (FT) holograms. A short description of the line composer, thermoplastic-photoconductive recording medium and optical system is given as background information for the experimental results. The reconstructed patterns show contrast ratios of... View full abstract»

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  • A Real-Time Parallel Optical Processing Technique

    Publication Year: 1975, Page(s):407 - 411
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5888 KB)

    Numerous parallel processing capabilities of holography have been described [1], [2]. Certain of these which are inherent in a (holographic) synthetic aperture radar [3]-[7] have also been discussed [8], including its parallel (simultaneous) phase curvature adjustments for all near-field reflecting objects, and its automatic (and parallel) adjustment of the (synthetic) aperture size so as to cause... View full abstract»

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  • Ultrasonic Holographic Fourier Spectroscopy via Optical Fourier Transforms

    Publication Year: 1975, Page(s):412 - 418
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7576 KB)

    Holographic Fourier spectroscopy has been extended to ultrasonic radiation. A recently developed acoustical-to-optical conversion cell (AOCC) was used to display the spectroscopic hologram. Real-time optical Fourier transformation of the ultrasonic interferogram can be obtained. View full abstract»

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  • Character Recognition with a Coherent Optical Multichannel Correlator

    Publication Year: 1975, Page(s):419 - 423
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3040 KB)

    A coherent-optical reading method for Optical Character Recognition Set A [OCR(A)]-numerics is derived modifying a customary coding method which has been used in optical correlators that feature signal input via ultrasonic light modulators for time compression of radar pulses. It is shown by computer simulation that unambiguous recognition of these numerics will be possible if combined application... View full abstract»

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  • Parallel Image Processing

    Publication Year: 1975, Page(s):424 - 433
    Cited by:  Papers (8)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2632 KB)

    Parallel image processing shows certain general similarities to retinal processing and shares with optical computing the characteristics of parallelism. Simulation on digital serial computers (DSC's), although possible in the simpler cases, very soon becomes almost uncontrollable, requiring large memories and very long programming and execution times. Advances in present circuit technology now per... View full abstract»

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  • Direct Coherent Optical Fourier Transform of Curves

    Publication Year: 1975, Page(s):434 - 442
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3080 KB)

    A coherent optical Fourier transform system is studied for which masks of curves only are used as input. A general theory for this problem is discussed, resulting in the functional connection between input and output data and limitations due to thickness, curvature, and extension of the curve. The general result can be simplified for a curve which represents a signal modulated by a carrier. In thi... View full abstract»

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  • Nonlinear Optical Data Processing and Filtering: A Feasibility Study

    Publication Year: 1975, Page(s):443 - 448
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1936 KB)

    The feasibility of nonlinear optical data processing with photochromic materials is analyzed. It is shown that a host of useful computations may be achieved by incorporating nonlinear optical elements (transparencies) into conventional optical data processing channels. View full abstract»

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  • New Outlook on Processing Radiation Received From Objects Viewed Through Randomly Fluctuating Media

    Publication Year: 1975, Page(s):449 - 456
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2744 KB)

    A unified approach to interferometry, holography, and the seeing problem is presented. Known interferometric techniques are arranged hierarchically and the concept of the "order" of an interferometer is introduced. When an interferometer is viewing a spatially incoherent object through a randomly fluctuating medium, it is argued that the field of view over which the observed data are isoplanatic d... View full abstract»

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  • IEEE Computer Society Publications

    Publication Year: 1975, Page(s): 456-a
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  • IEEE Computer Society Membership & Publications

    Publication Year: 1975, Page(s): 456
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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.

Full Aims & Scope

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