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Proceedings of the IEEE

Issue 6 • June 1994

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Displaying Results 1 - 12 of 12
  • Albert Hoyt Taylor [Scanning the Past]

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (98 KB)

    Presents a short biography of A. Hoyt Taylor and discusses his work in the fields of concealed radio receiving systems, radar, radio wave propagation and antennas. View full abstract»

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  • Improved techniques for single-pass adaptive vector quantization

    Publication Year: 1994, Page(s):933 - 939
    Cited by:  Papers (21)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1116 KB)

    Constantinescu and Storer presented a new single-pass adaptive vector quantization algorithm that learns a codebook of variable size and shape entries; they presented experiments on a set of test images showing that with no training or prior knowledge of the data, for a given fidelity, the compression achieved typically equals or exceeds that of the JPEG standard. This paper presents improvements ... View full abstract»

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  • Evaluating quality of compressed medical images: SNR, subjective rating, and diagnostic accuracy

    Publication Year: 1994, Page(s):919 - 932
    Cited by:  Papers (131)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Compressing a digital image can facilitate its transmission, storage, and processing. As radiology departments become increasingly digital, the quantities of their imaging data are forcing consideration of compression in picture archiving and communication systems (PACS) and evolving teleradiology systems. Significant compression is achievable only by lossy algorithms, which do not permit the exac... View full abstract»

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  • Arithmetic coding for data compression

    Publication Year: 1994, Page(s):857 - 865
    Cited by:  Papers (117)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    Arithmetic coding provides an effective mechanism for removing redundancy in the encoding of data. We show how arithmetic coding works and describe an efficient implementation that uses table lookup as a first alternative to arithmetic operations. The reduced-precision arithmetic has a provably negligible effect on the amount of compression achieved. We can speed up the implementation further by u... View full abstract»

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  • The sliding-window Lempel-Ziv algorithm is asymptotically optimal

    Publication Year: 1994, Page(s):872 - 877
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The sliding-window version of the Lempel-Ziv data-compression algorithm (sometimes called LZ '77) has been thrust into prominence recently. A version of this algorithm is used in the highly successful “Stacker” program for personal computers. If is also incorporated into Microsoft's new MS-DOS-6. Although other versions of the Lempel-Ziv algorithm are known to he optimal in the sense t... View full abstract»

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  • Split-merge video displacement estimation

    Publication Year: 1994, Page(s):940 - 947
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Motion Compensation is one of the most effective techniques used in interframe data compression. In this paper we present a parallel block-matching algorithm for estimating interframe displacement of blocks with minimum error. The algorithm is designed for a simple parallel architecture to process video in real time. The blocks may have variable size and shape depending on a split-and-merge techni... View full abstract»

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  • Optical computing techniques for image/video compression

    Publication Year: 1994, Page(s):948 - 954
    Cited by:  Papers (2)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The advantage of optics is its capability of providing highly parallel operations in a three-dimensional space. In this paper, we propose optical architectures to execute various image compression techniques. We optically implement the following compression techniques: transform coding, vector quantization, video coding. We show many generally used transform coding methods, for example, the cosine... View full abstract»

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  • Performance evaluation of trellis-coded modulation schemes

    Publication Year: 1994, Page(s):833 - 855
    Cited by:  Papers (53)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1528 KB)

    A description of the algorithms to evaluate the main parameters determining the performance of a trellis-coded modulation (TCM) scheme is presented. TCM schemes are divided into classes that have an increasing degree of symmetry, so as to properly match the various algorithms to each class. The algorithms are compared in terms of computational complexity and tested on a set of multidimensional PSK... View full abstract»

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  • On the Ziv-Lempel proof and related topics

    Publication Year: 1994, Page(s):866 - 871
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Results concerning the celebrated Ziv-Lempel sequence compression algorithm are revisited taking a rather intuitive approach. Also presented are ideas, which were previously formalized and extensions of these results to compression of two-dimensional data View full abstract»

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  • Textual image compression: two-stage lossy/lossless encoding of textual images

    Publication Year: 1994, Page(s):878 - 888
    Cited by:  Papers (28)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1092 KB)

    A two-stage method for compressing bilevel images is described that is particularly effective for images containing repeated subimages, notably text. In the first stage, connected groups of pixels, corresponding approximately to individual characters, are extracted from the image. These are matched against an adaptively constructed library of patterns seen so far, and the resulting sequence of sym... View full abstract»

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  • Comparison of international standards for lossless still image compression

    Publication Year: 1994, Page(s):889 - 899
    Cited by:  Papers (63)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    This overview focuses on a comparison of lossless compression capabilities of the international standard algorithms for still image compression known as MH, MR, MMR, JBIG, and JPEC. Where the algorithms have parameters to select, these parameters have been carefully set to achieve maximal compression. Compression variations due to differences in data are illustrated and scaling of these compressio... View full abstract»

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  • Advances in speech and audio compression

    Publication Year: 1994, Page(s):900 - 918
    Cited by:  Papers (112)  |  Patents (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2228 KB)

    Speech and audio compression has advanced rapidly in recent years spurred on by cost-effective digital technology and diverse commercial applications. Recent activity in speech compression is dominated by research and development of a family of techniques commonly described as code-excited linear prediction (CELP) coding. These algorithms exploit models of speech production and auditory perception... View full abstract»

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H. Joel Trussell
North Carolina State University