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IEEE Transactions on Communications

Issue 11 • Date November 1977

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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  • Introduction: Special Issue on Image Bandwidth Compression

    Publication Year: 1977, Page(s):1249 - 1251
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • Digital Coding of Color Video Signals - A Review

    Publication Year: 1977, Page(s):1349 - 1385
    Cited by:  Papers (40)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4260 KB)

    This paper reviews the field of the efficient coding of color television signals. Because this paper is perhaps the first review on this topic, some background is given in the areas of colorimetry, visual perception of color and color television systems. We assume that the reader has some familiarity with luminance encoding techniques. Coding techniques themselves are divided into two broad groups... View full abstract»

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  • [Back cover]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Comparison of Redundancy Reducing Codes for Facsimile Transmission of Documents

    Publication Year: 1977, Page(s):1425 - 1433
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A comparison and a valuation of different redundancy reducing coding techniques for the digital transmission of facsimile documents on telephone lines is presented. Especially taken into account are those codes which have been submitted to the International Telegraph and Telephone Consultative Committee (CCITT) for standardization of digital group 3 facsimile machines. The reduction factor and the... View full abstract»

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  • Digital Video: A Buffer-Controlled Dither Processor for Animated Images

    Publication Year: 1977, Page(s):1433 - 1440
    Cited by:  Papers (1)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    A new technique has been discovered which permits pseudo-gray tone video images to be played in real-time on bilevel, memory displays such as the ac plasma panel. The technique combines ordered dither processing, selective updating, and hysteretic thresholding to digitally transmit or store the video images. Only a 1 bit/pel frame memory plus a 0.3 bits/pel replenishment buffer are required. This ... View full abstract»

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  • Coding of Two-Tone Images

    Publication Year: 1977, Page(s):1406 - 1424
    Cited by:  Papers (49)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1704 KB)

    We review the concepts and techniques of efficient coding for the transmission or storage of two-tone images, such as business documents and weather maps. Digitization considerations are presented first. Then we discuss in detail the basic concepts (both heuristic and mathematical) of efficient coding. This is followed by descriptions of typical coding techniques. Finally, channel errors and buffe... View full abstract»

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  • Interframe Cosine Transform Image Coding

    Publication Year: 1977, Page(s):1329 - 1339
    Cited by:  Papers (58)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Two-dimensional transform coding and hybrid transform/DPCM coding techniques have been investigated extensively for image coding. This paper presents a theoretical and experimental extension of these techniques to the coding of sequences of correlated image frames. Two coding methods are analyzed: three-dimensional cosine transform coding, and two-dimensional cosine transform coding within an imag... View full abstract»

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  • Interframe Coding of 525-Line, Monochrome Television at 1.5 Mbits/s

    Publication Year: 1977, Page(s):1339 - 1348
    Cited by:  Papers (16)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1472 KB)

    Interframe coder simulation results are described for standard-broadcast-rate monochrome television in applications where the television camera is largely stationary, such as TV-conferencing or video telephone. An algorithm for coding at 1.5 Mbits/s, whose parameters were optimized via trial and error, produces pictures with little resolution loss for low-to-moderate movement, but somewhat visible... View full abstract»

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  • Adaptive Delta Modulation Systems for Video Encoding

    Publication Year: 1977, Page(s):1302 - 1314
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2520 KB)

    This paper describes several adaptive delta modulators designed to encode video signals. One- and two-dimensional ADM algorithms are discussed and compared. Results are shown for bit rates of 2 bits/pixel, 1 bit/pixel and 0.5 bits/pixel. Pictures showing the difference between the encodeddecoded pictures and the original pictures are presented. Results are also presented to illustrate the effect o... View full abstract»

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  • Quantization of TV Chrominance Signals Considering the Visibility of Small Color Differences

    Publication Year: 1977, Page(s):1393 - 1406
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A quantizing method for chrominance signals is presented which takes into account that the visibility of small color differences and the areas of reproducible colors are a function of luminance. For the evaluation of quantizing characteristics and for an estimate of the effectiveness of such a procedure, CIE (Commission International de l'Eclairage) formulas are used. It is proposed to subdivide t... View full abstract»

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  • DPCM Picture Coding with Adaptive Prediction

    Publication Year: 1977, Page(s):1295 - 1302
    Cited by:  Papers (29)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB)

    Adaptive prediction is a method of improving the prediction in differential pulse-code modulation (DPCM) systems. The information on contour directions derived from neighboring picture elements is used to select a suitable prediction value for the actual sample. An effective way for determining the contour direction, taking into account signal-source noise, quantization distortions and hardware co... View full abstract»

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  • Survey of Adaptive Image Coding Techniques

    Publication Year: 1977, Page(s):1275 - 1284
    Cited by:  Papers (41)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    The following is a survey of the technical literature on adaptive coding of imagery. Section 1 briefly discusses the general problem of image data compression. The optimum image data compression system, from a theoretical viewpoint, is presented in Section 1.1. The theoretical and the implementational problems of the optimum system are discussed and the assumptions that are made to overcome these ... View full abstract»

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  • Adaptive Coding of Monochrome and Color Images

    Publication Year: 1977, Page(s):1285 - 1292
    Cited by:  Papers (199)  |  Patents (67)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    An efficient adaptive encoding technique using a new implementation of the Fast Discrete Cosine Transform (FDCT) for bandwidth compression of monochrome and color images is described. Practical system application is attained by maintaining a balance between complexity of implementation and performance. FDCT sub-blocks are sorted into four classes according to level of image activity, measured by t... View full abstract»

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  • Encoding of Images Based on a Two-Component Source Model

    Publication Year: 1977, Page(s):1315 - 1322
    Cited by:  Papers (27)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1336 KB)

    In this paper we describe a code for grey-scale still images which separates the intensity function into two components: a discontinuous one representing intensity variations due to distinct objects and a continuous component due to such effects as texture. Each component is encoded separately and the two decoded components combined at the receiver. The code produces images with notably sharper de... View full abstract»

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  • Effects of Round-Off Noise on Hadamard Transformed Imagery

    Publication Year: 1977, Page(s):1292 - 1294
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The effects of hardware round-off error when using the two-dimensional Hadamard transform to code 8 by 8 pixel subpicture blocks of imagery are presented. The simulations show that at least 8 bits of precision are desirable. View full abstract»

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  • Rate-Distortion Coding Simulation for Color Images

    Publication Year: 1977, Page(s):1385 - 1392
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    We propose a distortion measure for color images, based on a mathematical model of color vision, and supported by subjective image quality evaluations. The visual model is configured after a simplified schematic of the retina's physiology and it transforms the red, green and blue image components into a representation that is consistent with major psychophysical phenomena. The distortion criterion... View full abstract»

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  • On Interframe Transform Coding

    Publication Year: 1977, Page(s):1323 - 1329
    Cited by:  Papers (12)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    This paper is concerned with interframe coding of monochrome pictures using 3-dimensional transforms. First, an algorithm which enables the vector processing of 3-dimensional arrays is derived. Next, this algorithm is used in an interframe transform coding experiment. Picture data (6 bits/pel) is processed in ( 4 \times 4 \times 4 ) blocks using the Walsh-Ha... View full abstract»

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  • On the Role of the Observer and a Distortion Measure in Image Transmission

    Publication Year: 1977, Page(s):1251 - 1267
    Cited by:  Papers (42)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1968 KB)

    This paper considers the characteristics of the human visual system as they are related to sensitivity to encoding errors in still achromatic images. The starting point is a discussion in Section I of the role of a numerical measure of distortion in the determination of optimum encoding. Section II then discusses several ways of determining properties of the human observer and discusses the method... View full abstract»

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  • Design of Quantizers for DPCM Coding of Picture Signals

    Publication Year: 1977, Page(s):1267 - 1274
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Visual thresholds play an important role in the process of incorporating properties of the human visual system in encoding picture signals. They tell us how much the picture signal can be perturbed without the perturbations being visible to human observers. We describe psychovisual experiments to determine the amplitude thresholds at a single edge having a given slope and then present methods to i... 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