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Proceedings of the IEEE

Issue 5 • May 1981

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): c1
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  • Scanning the issue

    Publication Year: 1981, Page(s):499 - 501
    Cited by:  Papers (1)
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  • Advances in mathematical models for image processing

    Publication Year: 1981, Page(s):502 - 528
    Cited by:  Papers (248)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2886 KB)

    Several state-of-the-art mathematical models useful in image processing are considered. These models include the traditional fast unitary transforms, autoregessive and state variable models as well as two-dimensional linear prediction models. These models introduced earlier [51], [52] as low-order finite difference approximations of partial differential equations are generalized and extended to hi... View full abstract»

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  • The importance of phase in signals

    Publication Year: 1981, Page(s):529 - 541
    Cited by:  Papers (729)  |  Patents (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2575 KB)

    In the Fourier representation of signals, spectral magnitude and phase tend to play different roles and in some situations many of the important features of a signal are preserved if only the phase is retained. Furthermore, under a variety of conditions, such as when a signal is of finite length, phase information alone is sufficient to completely reconstruct a signal to within a scale factor. In ... View full abstract»

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  • Applications of stochastic texture field models to image processing

    Publication Year: 1981, Page(s):542 - 551
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2039 KB)

    Stochastic models for the generation of two-dimensional texture fields have been used in studies of human visual texture perception. Such models also find application in image processing for the development of techniques for synthesizing and analyzing texture. This paper presents a survey of various stochastic texture models that have been developed. Results of visual texture discrimination experi... View full abstract»

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  • The role of human visual models in image processing

    Publication Year: 1981, Page(s):552 - 561
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    The mechanisms are discussed by which the human eye forms a neural image of the outside world for transmission along the optic nerve. Mathematical models of these mechanisms which can be exploited for engineering purposes are presented and their usefulness and limitatious are discussed. Three areas in which human vision models have been successfully applied are image bandwidth compression, image q... View full abstract»

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  • Correspondence processes in dynamic scene analysis

    Publication Year: 1981, Page(s):562 - 572
    Cited by:  Papers (83)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1314 KB)

    One of the fundamental problems in dynamic scene analysis is the tracking of objects from frame to frame. A general approach to tracking is to establish correspondences between points, or sets of points, between frames and then group the sets into objects based upon similarity of motion. This paper will focus on processes for establishing the correspondence between sets of points in successive fra... View full abstract»

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  • Computational vision

    Publication Year: 1981, Page(s):572 - 595
    Cited by:  Papers (70)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3335 KB)

    Research is beginning to uncover fundamental computational principles underlying vision that apply equally to artificial and natural systems. These principles provide insights into the limitations of early machine vision systems and lay a foundation for building future systems capable of high performance in a broad range of visual domains. We present this emerging computational view of visual perc... View full abstract»

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  • Image pattern recognition

    Publication Year: 1981, Page(s):596 - 605
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1288 KB)

    The general goal of image pattern recognition is to generate descriptions of images, and relate those descriptions to models characterizing classes of images. This paper reviews the subject from a technique-oriented standpoint. Topics covered include preprocessing; registration and matching; segmentation into parts; representation of the parts; and description in terms of properties of and relatio... View full abstract»

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  • Trends in image display systems

    Publication Year: 1981, Page(s):606 - 614
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (786 KB)

    Today, with large volumes of data, high throughput requirements, and more complex image processing algorithms, the emphasis is on interactive image processing. Consequently, image displays are beginning to occupy a central role in image processing architectures. This paper presents some historical background on image displays and identifies the functional capabilities required in today's displays.... View full abstract»

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  • Processing of X-ray images

    Publication Year: 1981, Page(s):615 - 627
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2022 KB)

    A review of three aspects of image processing of X-ray imagery is presented. Short reviews of computer assisted tomography and coded aperture imaging are given. The application of image enhancement and restoration to radiography is reviewed in greater depth. View full abstract»

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  • Analysis technology for land remote sensing

    Publication Year: 1981, Page(s):628 - 642
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2748 KB)

    In this paper an overview is provided of the development to the present time of the ability to analyze vertical views of the earth's surface by machine. The paper begins with a brief review of the several phases of effort which have led to today's operational capabilities, starting with the research phase of the 1960's which defined the basic fundamentals, and continuing with the developmental pha... View full abstract»

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  • Real-time digital image enhancement

    Publication Year: 1981, Page(s):643 - 654
    Cited by:  Papers (23)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1606 KB)

    A programmable system for enhancing monocular and stereographic images at video rates is presented. The system provides both automatic and interactive enhancement modes based on histogram modification and intensity mapping techniques. Experimental results which illustrate enhancement capabilities under a variety of scene types and conditions are described. View full abstract»

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  • Switchable end-fire element for three-dimensional array use

    Publication Year: 1981, Page(s):658 - 659
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (207 KB)

    Use of interpolation processor coefficients as weights in a particular line array format leads to an end-fire pattern having special properties. A wide, nearly constant gain main beam results which is complemented by a backside region having uniformly low peak sidelobe levels. Changing the polarity of one element reverses the direction of energy flow. Use of these simple line arrays as elements of... View full abstract»

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  • On the state description of nonlinear networks—Further results

    Publication Year: 1981, Page(s):659 - 660
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Starting from specified types of element constitutive relations, necessary and sufficient conditions are given, which lead to validity tests, for the existence of state-variable equations in terms of capacitor charges and inductor fluxes or in terms of capacitor voltages and inductor currents as state variables. The relation between the equilibrium states and operating points is also discussed. Th... View full abstract»

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  • One method of the circuit diagnosis

    Publication Year: 1981, Page(s):661 - 662
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    In this paper it is shown that properties of orthonormal excitations of the circuit that was used in [1] for deriving sensitivity can as well be used as a mathematical tool for the determination of element values of the analog circuits. Simple methods are then presented for the computation of the circuit elements if all the nodes are accessible. View full abstract»

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  • Remarks on system simplification using the Routh stability array

    Publication Year: 1981, Page(s): 662
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (119 KB)

    A novel method employing the Routh stability array is presented for obtaining a stable approximant for a stable system. View full abstract»

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  • Zero location techniques for the removal of amplitude skew in narrow-band-transformed bandpass characteristics

    Publication Year: 1981, Page(s):662 - 664
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    The narrow-band transformation is known to preserve the delay properties of the low-pass prototype. Simultaneous arithmetic symmetry in the magnitude characteristic is shown to be possible by appropriate location of the numerator zeros. View full abstract»

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  • Comments on "Digitally programmable gain amplifiers with arbitrary range of integer values"

    Publication Year: 1981, Page(s):664 - 665
    Cited by:  Papers (2)
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  • Remarks on the emission coefficient of a bipolar transistor

    Publication Year: 1981, Page(s):665 - 666
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    The extent to which it is necessary-and the collector current range over which it is valid-to characterize the base-emitter junction of a bipolar transistor by a nonunity emission coefficient is clarified by a simple theoretical argument based on a consideration of base majority carrier charge. View full abstract»

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  • Moments of intersymbol interference

    Publication Year: 1981, Page(s):666 - 667
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    A new derivation of a recursion relation for the moments associated with intersymbol interference in multilevel PAM transmission is presented. This simple derivation uses certain properties of the cumulant generating function. View full abstract»

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  • Recursive two-dimensional signal reconstruction from linear system input and output magnitudes

    Publication Year: 1981, Page(s):667 - 668
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (243 KB)

    A recursive algorithm is presented for reconstructing a two-dimensional complex signal from its magnitude and the magnitude of the output of a known linear shift-invariant system whose input is the desired signal. The recursion has a simple geometric interpretation, and is easily extended to causal, shift-varying systems. View full abstract»

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  • Generalized true three-dimensional reconstruction algorithm

    Publication Year: 1981, Page(s):668 - 670
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (511 KB)

    A generalized true three-dimensional reconstruction (TTR) algorithm applicable to a sphere or cylindrical geometry is described. A new composite filter concept which is applicable to all forms of three-dimensional geometries, especially suitable for a truncated sphere is introduced and incorporated into image reconstruction of physically realizable detector array system such as the truncated spher... View full abstract»

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  • Phaselock techniques

    Publication Year: 1981, Page(s):671 - 672
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    Freely Available from IEEE
  • Systems: Decomposition, optimization and control

    Publication Year: 1981, Page(s): 671
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    Freely Available from IEEE

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H. Joel Trussell
North Carolina State University