Canadian Journal of Electrical and Computer Engineering

Issue 1-2 • Jan.-April 1998

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Publication Year: 1998, Page(s): c1
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  • [Front inside cover]

    Publication Year: 1998, Page(s): c2
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  • Table of contents

    Publication Year: 1998, Page(s):1 - 2
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  • Special issue — Visual computing and communications

    Publication Year: 1998, Page(s):3 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    Le traitement de l'information visuelle en communications devient de plus en plus important avec le développement des réseaux à large bande, de la technologie de l'image et du vidéo, des stations de travail et processeurs multimédia de haut de gamme, et des outils pour l'indexation, le furetage et l'archivage. View full abstract»

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  • Degradation mechanisms in multigeneration of MPEG compressed video

    Publication Year: 1998, Page(s):5 - 9
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3827 KB)

    This paper describes mechanisms that cause degradation in multigeneration of MPEG compressed video. We present five mechanisms that contribute to the continued degradation in multigeneration: pixel domain quantization (PDQ), pixel domain clipping (PDC), compression control parameters variation (CCPV), motion vector re-estimation (MVR) and error propagation due to motion compensation (EPMC). Multig... View full abstract»

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  • Subjective evaluation of the digital HDTV grand Alliance system

    Publication Year: 1998, Page(s):11 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6283 KB)

    Subjective evaluations of the digital high-definition television (HDTV) Grand Alliance System were performed by the Advanced Television Evaluation Laboratory of the Communications Research Centre in Ottawa, Ontario. The overall quality of the Grand Alliance System in both interlaced and progressive modes was examined. Additional tests were conducted to assess the ability of the system to co-exist ... View full abstract»

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  • HVS-based image compression using the wavelet transform

    Publication Year: 1998, Page(s):17 - 22
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5525 KB)

    A simple image-compression scheme based on the wavelet transform and properties of the human visual system (HVS) is proposed. The scheme attempts to achieve better performance results than those achieved with the well-established JPEG compression technique for very high image-quality levels. To achieve this, the wavelet scheme tries to identify the wavelet filter that will result in the smallest n... View full abstract»

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  • Muscle-based analysis/synthesis video coding

    Publication Year: 1998, Page(s):23 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6744 KB)

    We present an analysis/synthesis coding scheme for visual telephony, based on a wire-frame and simulated-muscle model of the human head. Anatomically accurate muscles control facial synthesis from a stored texture map, providing economical representation of human facial expressions. Our main contribution is the development of a steepest-descent analysis algorithm that accurately and robustly track... View full abstract»

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  • A perturbation analysis and performance bound for the estimation of 3-D camera translation direction

    Publication Year: 1998, Page(s):31 - 42
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11193 KB)

    The estimation of the 3-D displacement of a moving camera relative to a scene is critical for applications in robotics as well as object-based video compression. By estimating the relative motion within a scene, one can accurately predict object positions for the future, thereby reducing the amount of information which must be coded. This problem has an inherently nonlinear nature and can therefor... View full abstract»

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  • Gray-scale and colour image segmentation via region growing and region merging

    Publication Year: 1998, Page(s):43 - 47
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8626 KB)

    This paper introduces image segmentation as an important first task of any image-analysis process. A seeded region-growing and -merging algorithm is created to segment gray-scale and videophone-type colour images. The approach starts with a set of seed pixels, and from these grows regions by appending to each seed pixel those neighbouring pixels that satisfy a certain predicate. Small regions of f... View full abstract»

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  • An algorithmic study on context modelling for lossless image compression

    Publication Year: 1998, Page(s):49 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1896 KB)

    Statistical context modelling is a powerful and versatile technique for lossless image coding. A key issue in context modelling is how to increase the order of model without drastically increasing the model cost. We take an algorithmic approach to address the issue and propose a few heuristical optimization techniques that fine tune models of relatively few parameters in the sense of entropy minim... View full abstract»

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  • Multimedia communications: Reaching a critical threshold

    Publication Year: 1998, Page(s):55 - 59
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB)

    Maturation of communication and computer technology in four related, converging areas has recently created an environment in which the basic necessary and sufficient functionality is in place to provide universal multimedia communication services, including video teleconferencing. This paper reviews a number of very recent and current activities in an attempt to indicate that a threshold capabilit... View full abstract»

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  • Efficient MPEG-2 encoding of interlaced video

    Publication Year: 1998, Page(s):61 - 67
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2299 KB)

    The MPEG-2 standard provides the enabling technology for a wide variety of applications such as satellite broadcasting and CATV. We present an MPEG-2-compliant interlaced video encoder that employs an efficient macroblock coding mode selection method, a simple motion vector prediction technique, and a computation constrained motion vector search algorithm. The macroblock coding mode is selected ba... View full abstract»

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  • A generalized class of fractal-wavelet transforms for image representation and compression

    Publication Year: 1998, Page(s):69 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9321 KB)

    The action of an affine fractal transform or (local) lterated Function System with gray-level Maps (IFSM) on a function f(x) induces a simple mapping on its expansion coefficients, cij, in the Haar wavelet basis. This is the basis of the discrete fractal-wavelet transform, where subtrees of the wavelet coefficient tree are scaled and copied to lower subtrees. Such transforms, which we shall also r... View full abstract»

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  • Multi-program video coding with joint rate control

    Publication Year: 1998, Page(s):85 - 88
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2008 KB)

    This paper presents a joint coding scheme for multi-program video transmission in which the channel capacity is distributed among programs according to their content complexities. The program-dependent bit allocation is achieved by using the same quantization parameter for all the programs at each frame. The joint coding implements a joint rate control which controls the sum of the bit rates for a... View full abstract»

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  • Motion field estimation using segmentation and consistency constraint

    Publication Year: 1998, Page(s):89 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4448 KB)

    This paper presents an approach to realistic motion field estimation. With this approach, an image is first segmented into homogeneous regions using a new multiscale gradient algorithm followed by watershed transformation. The multiscale gradient algorithm efficiently solves the oversegmentation problem of watershed transformation, increases segmentation accuracy and reduces the computational cost... View full abstract»

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  • Robust scene-change detection in MPEG compressed domain

    Publication Year: 1998, Page(s):95 - 99
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1519 KB)

    Video is an important and challenging medium and requires sophisticated indexing schemes for efficient retrieval from visual databases. Video segmentation is a fundamental step in video indexing and involves detection of scene changes. In this paper, we propose a fast and robust algorithm for detecting video shot boundaries in the MPEG-2 compressed bit stream with minimal decoding. View full abstract»

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  • [Back inside cover]

    Publication Year: 1998, Page(s): c3
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1998, Page(s): c4
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    Freely Available from IEEE

Aims & Scope

The role of the Canadian Journal of Electrical and Computer Engineering is to provide scientific and professional activity for its members in Canada, the CJECE complements international journals and will be of particular interest to anyone involved in research and development activities in the field of electrical and computer engineering.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dr. Shahram Yousefi
Dept. of Electrical and Computer
     Engineering
Queen's University