Proceedings of the IEEE

Issue 7 • July 1972

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Displaying Results 1 - 25 of 42
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1972, Page(s):766 - 767
    Cited by:  Papers (2)
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    Freely Available from IEEE
  • Digital pictures fifty years ago

    Publication Year: 1972, Page(s):768 - 770
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1632 KB)

    Automatic translation of the lights and shades of a picture into a digital record tape and its reconversion to a picture were elements of the Bartlane picture transmission system in operation on telegraph circuits fifty years ago. s. Using digital signals on submarine cables, the Bartlane system handled nearly 500 pictures of portant news events prior to the outbreak of war in Europe in 1939. Publ... View full abstract»

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  • Visual fidelity criterion and modeling

    Publication Year: 1972, Page(s):771 - 779
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1001 KB)

    Fidelity measures and criteria for visual communications are discussed. It is recognized that the basis of visual fidelity assessment is subjective judgement of reproduced pictures. However, in design and elsewhere there is also need for explicit evaluation of visual communication waveforms. The rate distortion theory model for such evaluations is brought out and two existing evaluations of limite... View full abstract»

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  • Intraframe coding for picture transmission

    Publication Year: 1972, Page(s):779 - 791
    Cited by:  Papers (20)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2483 KB)

    A great variety of intraframe coding techniques have been proposed and demonstrated in recent years. Most of them exploit the properties of both the image and the human viewer. These properties are discussed briefly so as to provide a framework for describing the various coding techniques. The development of intraframe coders has been an evolutionary process. Techniques such as delta modulation (D... View full abstract»

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  • Interframe coding of videotelephone pictures

    Publication Year: 1972, Page(s):792 - 800
    Cited by:  Papers (28)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1753 KB)

    Television signals contain a great deal of frame-to-frame redundancy because picture areas are scanned in every frame whether they have changed or not. That portion of the signal describing stationary images need not be retransmitted in every frame if adequate memory is provided at the receiver. The signal describing moving images must be transmitted, of course, but it requires progressively less ... View full abstract»

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  • Rate-distortion theory and application

    Publication Year: 1972, Page(s):800 - 808
    Cited by:  Papers (50)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1690 KB)

    The theoretical minimum channel capacity required to transmit a given source at a given average distortion level is discussed. The limitations and applications of the theory are reviewed with particular emphasis on the use of the results for guiding practical system design and for bounding system performance. Applications are oriented toward video sources. View full abstract»

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  • Transform picture coding

    Publication Year: 1972, Page(s):809 - 820
    Cited by:  Papers (160)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (5795 KB)

    Picture coding by first dividing the picture into sub-pictures and then performing a linear transformation on each sub-picture cud quantizing and coding the resulting coefficients is introduced from a heuristic point of view. Various transformation, quantization, and coding strategies are discussed. A survey of all known applications of these techniques to monochromatic image coding is presented a... View full abstract»

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  • Recent developments in digital image processing at the image processing laboratory at the jet propulsion laboratory

    Publication Year: 1972, Page(s):821 - 828
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (5773 KB)

    Image processing of spacecraft images has been carried on at the Jet Propulsion Laboratory since 1964. The most recent advances in removal of geometric distortion and residual image effects along with various types of mapping projections are covered. The recent applications of image processing to the areas of bio-medicine, forensic sciences, and astronomy are discussed. These treatments are of a t... View full abstract»

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  • Image processing in the context of a visual model

    Publication Year: 1972, Page(s):828 - 842
    Cited by:  Papers (243)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (8397 KB)

    A specific relationship between some of the current knowledge and thought concerning human vision and the problem of controlling subjective distortion in processed images are reviewed. View full abstract»

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  • Image restoration: The removal of spatially invariant degradations

    Publication Year: 1972, Page(s):842 - 853
    Cited by:  Papers (53)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4141 KB)

    This is a review of techniques for digtal restoration of images. Optical and other analog processors are not discussed. Restoration is considered from the point of view of space-domain as well as of spatial-frequency-domain descriptions of images. Consideration is restricted to degradations arising from noise and spatially invariant blurring. However, many of the space-domain methods apply, with m... View full abstract»

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  • Space-variant image motion degradation and restoration

    Publication Year: 1972, Page(s):854 - 861
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1476 KB)

    A description of motion degradation in linear incoherent optical systems is presented. Given a mechanical description of the motion, an equivalent linear space-variant system containing all the motion effects is derived, and detailed examples of common types of variant and invariant motion are included. Following a review of restoration techniques for motion blur, a method for image restoration ap... View full abstract»

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  • Inverse filtering for linear shift-variant imaging systems

    Publication Year: 1972, Page(s):862 - 872
    Cited by:  Papers (65)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4419 KB)

    A technique is introduced for inverse filtering of linear shift-variant imaging systems. The technique requires that the linear system be decomposed into a distortion of the input plane followed by a shift-invariant operation and terminated by a distortion of the output plane. Such a representation is motivated by the fact that the coma aberration may be represented in this way. The paper includes... View full abstract»

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  • Role of recursive estimation in statistical image enhancement

    Publication Year: 1972, Page(s):872 - 877
    Cited by:  Papers (63)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1453 KB)

    Recursive linear and nonlinear estimation concepts are applied to the problem of image enhancement, whereby procedures for the derivation of the estimators are developed. These procedures are applicable to enhancement of images characterized statistically by their mean and correlation function. Design of an approximate time invariant and a time varying estimator is discussed and the implications o... View full abstract»

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  • Two-dimensional Bayesian estimate of images

    Publication Year: 1972, Page(s):878 - 883
    Cited by:  Papers (134)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2769 KB)

    A dynamic model for pictorial data that can be represented by a random field of an exponential autocorrelation function is developed. A partial difference equation describes the dynamic model and is used to realize a two-dimensional recursive filter that gives a Bayesian-estimate of the pictorial data from a noisy observation of the data. It is assumed that the noise is additive, white, and uncorr... View full abstract»

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  • Data structures and computational organization in digital image enhancement

    Publication Year: 1972, Page(s):884 - 887
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1070 KB)

    Two practical questions in developing an image enhancement computer program are considered: the data structure for the matrix of image samples, and computing the FFT of a large matrix. Experience in developing such programs is discussed, and characteristics of an enhancement program developed for the CDC 6600/7600 computers are described. View full abstract»

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  • A comparison of computations for spatial frequency filtering

    Publication Year: 1972, Page(s):887 - 891
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (975 KB)

    Three computational algorithms for performing spatial frequency filtering are compared and tradeoffs developed. Although each method is defined by a convolution relation, the convolution computations are different. Equal filter point-spread functions are assumed to effect the comparison. If the filter point-spread function is nonzero only over a small area, then the computation tradeoff is simply ... View full abstract»

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  • N topics in search of an editorial: Heuristics, superresolution, and bibliography

    Publication Year: 1972, Page(s):891 - 894
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (529 KB)

    This paper is the result of editorial license in the effect that it is designed to augment the invited papers for enhancement and restoration in this issue. Unfortunately this editor found the genesis of a special issue to be a very dynamic process, and as such this paper has experienced many contortions. However, it is hoped that a few topics not covered earlier, but which warrant some discussion... View full abstract»

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  • Charge density in a conducting medium

    Publication Year: 1972, Page(s):899 - 900
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (297 KB)

    It is well-known that no permanent distribution of free charge can exist in a conductor. A common development of a "relaxation time" concludes that a charge distribution imposed in a conductor will decay exponentially with a time constant ε/σ. This development utilizes Ohm's law, J = σE, with σ constant, which is inappropriate for a variable charge density. The resulting relaxa... View full abstract»

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  • Admittance and radiation efficiency of the human body in the resonance region

    Publication Year: 1972, Page(s):900 - 901
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (367 KB)

    By using the body as a monopole antenna the admittance and radiation efficiency have been measured in the frequency range 30-70 MHz. It is concluded that there are no resonance effects. The efficiency is about -2 dB at the higher frequencies. View full abstract»

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  • Energy relations for waves in strongly dispersive media

    Publication Year: 1972, Page(s):901 - 902
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (209 KB)

    Expressions for the averaged stored energy, energy flow, and energy velocity of quasi-monochromatic waves in temporally and spatially dispersive media have been extended to take into account broad-band signals in strongly dispersive media. View full abstract»

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  • Determination of the periodic steady-state response of systems of implicit state equations using Newton's method

    Publication Year: 1972, Page(s):902 - 903
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (212 KB)

    For a system described by implicit state equations, it is shown that the state transition matrix of the system of first variation about x(t), where x(t) satisfies the state equations, can be efficiently obtained from numerical data needed to calculate x(t). View full abstract»

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  • On generalizations of the maximum power transfer problem

    Publication Year: 1972, Page(s):903 - 904
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (212 KB)

    The necessary conditions for maximum power transfer to the outputs of a multiport are discussed. The condition Z = Z0*is sufficient. A solution to this problem is not generally unique, because the matrix Z must satisfy the matrix equation Z(Z0+ Z0*)-1E0= - Z0(Z0+ Z0*)-1 View full abstract»

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  • Transformation of nonlinear continuous systems with stochastic coefficients

    Publication Year: 1972, Page(s):904 - 905
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (225 KB)

    Nonlinear continuous systems with stochastic coefficients are converted into deterministic systems with stochastic inputs by the analytic method of transformations. View full abstract»

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  • Response of a dual coaxial resistor to a sharply rising pulse

    Publication Year: 1972, Page(s):905 - 906
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (247 KB)

    A cylindrical resistor is made the common conductor between two coaxial systems. A sharply rising current pulse is passed through the first system and the voltage response of the second system is evaluated. View full abstract»

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North Carolina State University