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IEEE Transactions on Communications

Issue 12 • December 1981

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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  • Guest Editors' Prologue - Scanning the Issue

    Publication Year: 1981, Page(s):1725 - 1727
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  • An Adaptive Strategy for Hybrid Image Coding

    Publication Year: 1981, Page(s):1736 - 1740
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    In hybrid coding technique, the sampled data are divided into blocks ofN times Msamples. Next, each block is transformed to generate a one-dimensional transform of each line in the block. The transform coefficients are then processed by a block of DPCM encoders which uncorrelate the data in the second dimension and qnantize the uncorrelated samples using appropriate quantizers. In this ... View full abstract»

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  • Interfield Hybrid Coding of Component Color Television Signals

    Publication Year: 1981, Page(s):1740 - 1753
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1564 KB)

    Hybrid coding of color television images at broadcast standards is investigated. This involves two-dimensional discrete cosine transform (2-D DCT) of each field, followed by the differential pulse code modulation (DPCM) between successive fields. Two 22frame sequences of "Water Skier" and "Wheel of Fortune" in component form, i.e., luminanceYand chrominanceIandQ, w... View full abstract»

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  • Robust Two-Dimensional Tree Encoding of Images

    Publication Year: 1981, Page(s):1786 - 1798
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2564 KB)

    A class of robust two-dimensional (2-D) tree coding procedures are described for efficient encoding of monochrome images. The encoding filter is designed on the basis of ensemble properties of a particular class of stochastic random fields which have been shown to provide a useful model for typical imagery data. We make use of the (M; K', L') algorithm in instrumenting the 2-D tree sear... View full abstract»

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  • A Two-Channel Picture Coding System: I - Real-Time Implementation

    Publication Year: 1981, Page(s):1841 - 1848
    Cited by:  Papers (7)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1150 KB)

    The two-channel system previously reported has been implemented in hardware using system parameters appropriate to consumer television. The basic system divides the spectrum into lowand high-frequency spatial components. The lows are coarsely sampled and finely quantized and the highs finely sampled and coarsely quantized using a companded, randomized quantizer. The purpose of this experiment was ... View full abstract»

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  • A Two-Channel Picture Coding System: II - Adaptive Companding and Color Coding

    Publication Year: 1981, Page(s):1849 - 1858
    Cited by:  Papers (13)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1250 KB)

    The two-channel picture coding system previously reported is improved by adaptive companding and extended to component color coding. The basic system divides the spectrum into lowand high-frequency spatial components. The former are coarsely sampled and finely quantized, while the latter are finely sampled and coarsely quantized using a companded, randomized quantizer. The adaptive version uses a ... View full abstract»

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  • Japanese VIDEOTEX System "CAPTAIN" - Experimental Service and User Reactions Outline

    Publication Year: 1981, Page(s):1959 - 1967
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (850 KB)

    The CAPTAIN system is a VIDEOTEX system in Japan. Existing telephone lines are used for transmission and home TV sets are used for the display units. The first experimental service (with 1000 user terminals, 199 information providers, and 100 000 displays frames) was carried out from December 1979 to March 1981 by the Ministry of Posts and Telecommunications and the Nippon Telegraph and Telephone ... View full abstract»

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  • [Back cover]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Channel Error Recovery for Transform Image Coding

    Publication Year: 1981, Page(s):1754 - 1762
    Cited by:  Papers (19)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1936 KB)

    A method is presented to automatically inspect the block boundaries of a reconstructed two-dimensional transform coded image, to locate blocks which are most likely to contain errors, to approximate the size and type of error in the block, and to eliminate this estimated error from the picture. This method uses redundancy in the source data to provide channel error correction. No additional channe... View full abstract»

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  • Pre-Press Picture Processing in the Graphic Arts Industry

    Publication Year: 1981, Page(s):1891 - 1897
    Cited by:  Papers (1)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The graphic arts industry embraces all aspects of picture and graphic preparation prior to the actual running of a printing press. Electronic equipment is now available for much of this work, including such processes as the scanning and color separation of color material, the storage and transmission of data within a plant or to remote sites, the spatial manipulation of images in the assembly of p... View full abstract»

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  • Visual Communication Systems for the Deaf

    Publication Year: 1981, Page(s):1986 - 1992
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    The paper is in two parts. The first (Section II) describes six years' operating experience with an in-house switched videotelephone system installed in the headquarters of the Royal National Institute for the Deaf, London. The system, which has recently been extended to 10 terminals, has confirmed the usefulness and practicality of switched television for both deaf-to-hearing and deaf-to-deaf com... View full abstract»

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  • Adaptive Block/Location Coding of Facsimile Signals Using Subsampling and Interpolation for Pre- and Postprocessing

    Publication Year: 1981, Page(s):1925 - 1934
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    In this paper, an information lossy preprocessing technique using subsampling is described. Notches and pinholes in the original image are first removed using a set of masks, after which single element runs are doubled to preserve connectivity. The image is then subsampled by taking alternate picture elements (pels) horizontally and vertically. Enlargement of the subsampled image is carried out at... View full abstract»

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  • Application of Pseudorandom Noise to DPCM

    Publication Year: 1981, Page(s):1763 - 1767
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    The conventional DPCM compression algorithm has been substantially improved by the substitution of a tapered, noisy quantizer for the usual tapered quantizer. This markedly reduces the visibility of defects caused by granular noise and leak. The quantizer characteristic can then be modified to achieve less slope overload, thus significantly improving image quality. View full abstract»

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  • Simplified 6.3 Mbit/s Codec for Video Conferencing

    Publication Year: 1981, Page(s):1877 - 1882
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A color TV codec with a 6.3 Mbit/s transmission bit-rate has been simplified by a newly developed coding method. This method is the combination of a 4-to-1 dot interlace system and 4 bit/pel DPCM. A digital filtering technique for reducing coding distortion is also employed. In comparison with an interframe codec having the same transmission bit-rate, the amount of codec circuitry is halved. Subje... View full abstract»

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  • A Modified Adaptive Delta Modulator

    Publication Year: 1981, Page(s):1767 - 1785
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3128 KB)

    This paper presents the results of a study in data compression of adaptive delta modulated video signals. The Song mode ADM is first investigated at a sampling rate of 16 Mbits/s and shown not to produce enough redundancy to warrant entropy encoding. We then present a modified adaptive delta modulator algorithm that operates at a sampling rate of 16 Mbits/s and does produce sufficient redundancy t... View full abstract»

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  • High Definition Television Systems: Desirable Standards, Signal Forms, and Transmission Systems

    Publication Year: 1981, Page(s):1882 - 1891
    Cited by:  Papers (37)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    Since 1970, the Japan Broadcasting Corporation (NHK) has been making efforts in studies of future high-definition television systems in response to the expected demands of a future postindustrial society. The standards and signal systems and transmission parameters appropriate to high-definition TV are discussed. Several TV standards and the desired signal-to-noise ratios that will fit in with var... View full abstract»

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  • Improvements to the Constant Area Quantization Bandwidth Compression Scheme

    Publication Year: 1981, Page(s):1818 - 1823
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Two modifications to the constant area quantization (CAQ) video bandwidth compression scheme are described which together reduce the mean square error (MSE) in the reconstructed image by up to 70 percent. The first modification is merely a change in the CAQ algorithm requiring no additional hardware, whereas the second modification exploits line-to-line redundancies and necessitates the inclusion ... View full abstract»

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  • Time Compression Multiplexing of Multiple Television Signals in Satellite Channels Using Chirp Transform Processors

    Publication Year: 1981, Page(s):1832 - 1840
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Higher picture quality and better link utilization can be obtained using time compression multiplexing of color television signals in satellite channels instead of the conventional approach of frequency-division multiplexing. A time compression/expansion technique based on chirp transforms is proposed for such an application. The real-time chirp transform needed is realizable by surface acoustic w... View full abstract»

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  • Simultaneous Transmission of Voice and Handwriting Signals: "Sketchphone System"

    Publication Year: 1981, Page(s):1982 - 1986
    Cited by:  Papers (12)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The "Sketchphone" is an audiographic communication terminal which makes it possible to transmit handwriting and speech signals simultaneously over a telephone channel. Computer simulation of a voice interleaving technique which causes little degradation in telephone conversation quality was carried out to achieve simultaneous transmission of two signals. A complete "Sketchphone" set has not yet be... View full abstract»

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  • 30 Mbit/s Codec for the NTSC Color TV Signal Using an Interfield-Intrafield Adaptive Prediction

    Publication Year: 1981, Page(s):1859 - 1867
    Cited by:  Papers (24)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    This paper proposes a new approach to the composite coding of the NTSC color TV signal, i.e., an interfield-intrafield adaptive prediction. First, concerning prediction efficiency for various moving pictures, an advantage of this coding scheme over interframe coding is clarified theoretically and experimentally. This adaptive prediction gives very good and stable performance for still to violently... View full abstract»

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  • A Pinned Sine Transform Image Coder

    Publication Year: 1981, Page(s):1728 - 1735
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2104 KB)

    The pinned sine transform (PST) coder described is a practical approximation to the pinned KLT coder. The image is partitioned into two fields: a boundary field, which depends only on the coded block boundaries, and a pinned field, which vanishes at the boundaries and is subsequently sine transformed and compressed. The reconstructed image is continuous across the block boundaries and "blocking ef... View full abstract»

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  • A Picture Browsing System

    Publication Year: 1981, Page(s):1968 - 1976
    Cited by:  Papers (4)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    We describe a system for storing pictures in a database and retrieving them from a remote location over a low bit-rate channel. Even with compression techniques, it takes a long time to transmit a picture, making search for a picture of desired attributes time-consuming. Our system improves the human interaction with the picture database by constructing an auxiliary text database containing a list... View full abstract»

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  • Sampling and Reconstruction of NTSC Video Signals at Twice the Color Subcarrier Frequency

    Publication Year: 1981, Page(s):1823 - 1832
    Cited by:  Papers (15)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Methods for sampling and reconstruction of NTSC video signals at twice the color subcarrier frequency are described and evaluated. A scheme for sampling NTSC signals is characterized by the horizontal sampling frequency and the spatiotemporal sampling structure. For a given sampling frequency, the sampling structure should be chosen to permit the best subjective reconstruction of the analog signal... View full abstract»

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  • Displacement Measurement and Its Application in Interframe Image Coding

    Publication Year: 1981, Page(s):1799 - 1808
    Cited by:  Papers (1019)  |  Patents (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1800 KB)

    A new technique for estimating interframe displacement of small blocks with minimum mean square error is presented. An efficient algorithm for searching the direction of displacement has been described. The results of applying the technique to two sets of images are presented which show 8-10 dB improvement in interframe variance reduction due to motion compensation. The motion compensation is appl... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas