Subband Coding

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Avideh Zakhor - One of the best experts on this subject based on the ideXlab platform.

  • multirate 3 d Subband Coding of video
    IEEE Transactions on Image Processing, 1994
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    We propose a full color video compression strategy, based on 3-D Subband Coding with camera pan compensation, to generate a single embedded bit stream supporting multiple decoder display formats and a wide, finely gradated range of bit rates. An experimental implementation of our algorithm produces a single bit stream, from which suitable subsets are extracted to be compatible with many decoder frame sizes and frame rates and to satisfy transmission bandwidth constraints ranging from several tens of kilobits per second to several megabits per second. Reconstructed video quality from any of these bit stream subsets is often found to exceed that obtained from an MPEG-1 implementation, operated with equivalent bit rate constraints, in both perceptual quality and mean squared error. In addition, when restricted to 2-D, the algorithm produces some of the best results available in still image compression. >

  • orientation adaptive Subband Coding of images
    IEEE Transactions on Image Processing, 1994
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    In the Subband Coding of images, directionality of image features has thus far been exploited very little. The proposed Subband Coding scheme utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates, At comparable bit rates, the subjective image quality obtained by our orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches such as the JPEG compression standard. >

  • orientation adaptive Subband Coding of images
    International Symposium on Circuits and Systems, 1993
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    A Subband Coding scheme is proposed. It utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates. At comparable bit rates, the subjective image quality obtained by the authors' orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches, such as the JPEG compression standard. >

  • ISCAS - Orientation adaptive Subband Coding of images
    1993 IEEE International Symposium on Circuits and Systems, 1
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    A Subband Coding scheme is proposed. It utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates. At comparable bit rates, the subjective image quality obtained by the authors' orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches, such as the JPEG compression standard. >

Soura Dasgupta - One of the best experts on this subject based on the ideXlab platform.

  • EUSIPCO - Subband Coding of cyclostationary signals with overdecimated filter banks
    2002
    Co-Authors: Soura Dasgupta, Ashish Pandharipande
    Abstract:

    We consider optimal orthonormal filter banks for Subband Coding of wide sense cyclostationary signals, with N-periodic second order statistics. An L-channel over decimated uniform filter bank, with N-periodic analysis and synthesis filters, is used as the Subband coder. An average variance condition is used to measure the output distortion. We show that for at least three potential bit allocation strategies, the optimum filter bank is a principal component filter bank. This is in the same vein as our earlier results on Subband Coding with maximally decimated filter banks.

  • Optimality in Multi Carrier Communication, Multiple Description Coding and the Subband Coding of Cyclostationary Signals
    IFAC Proceedings Volumes, 2001
    Co-Authors: Soura Dasgupta, Ashish Pandharipande
    Abstract:

    Abstract This paper considers three different problems in signal processing/communications. The first involves Multiuser Discrete Multitone Transmission (DMT). The other two problems concerns variants of Subband Coding, specifically Subband Coding of cyclostationary signals and the multiple description Coding. We show that underlying each is the same optimization problem that can be solved using the theory of majorization.

  • Signal compression by Subband Coding
    Automatica, 1999
    Co-Authors: Bruce A. Francis, Soura Dasgupta
    Abstract:

    This is a survey/tutorial paper on data compression using the technique of Subband Coding. This is widely used in practice, for example, in the MPEG audio coder. A Subband coder has two main components: a filter bank that decomposes the source into components, usually with respect to defined frequency bands; and a bank of quantizers. Without the quantizers, the Subband coder-decoder is a linear periodically time-varying discrete-time system, and hence falls into the class of multirate digital signal processing systems. The paper reviews the theory of such systems, studies the perfect reconstruction problem and a variant of it, reviews Subband Coding theory for a stationary input signal, and describes recent work for cyclostationary signals.

  • Signal compression by Subband Coding
    Automatica, 1999
    Co-Authors: Bruce A. Francis, Soura Dasgupta
    Abstract:

    This is a survey/tutorial paper on data compression using the technique of Subband Coding. This is widely used in practice, for example, in the MPEG audio coder. A Subband coder has two main components: a filter bank that decomposes the source into components, usually with respect to defined frequency bands; and a bank of quantizers. Without the quantizers, the Subband coder-decoder is a linear periodically time-varying discrete-time system, and hence falls into the class of multirate digital signal processing systems. The paper reviews the theory of such systems, studies the perfect reconstruction problem and a variant of it, reviews Subband Coding theory for a stationary input signal, and describes recent work for cyclostationary signals.

  • ICASSP - Optimum Subband Coding of cyclostationary signals
    1999 IEEE International Conference on Acoustics Speech and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258), 1999
    Co-Authors: Soura Dasgupta, Chris Schwarz, Brian D. O. Anderson
    Abstract:

    We consider the optimal orthonormal Subband Coding of zero mean cyclostationary signals, with N-periodic second order statistics. A 2-channel uniform filter bank, with N-periodic analysis and synthesis filters, is used as the Subband coder. A dynamic scheme involving N-periodic bit allocation is employed. An average variance condition is used to measure the output distortion. The conditions for maximizing the Coding gain parallel those for the case when the signals are wide sense stationary (WSS) and the analysis and synthesis filters and the bit allocation time invariant, in that the blocked Subband signals must be decorrelated and the Subband power spectral densities must obey an ordering. Some additional conditions on this ordering, over and above those required for the WSS case, are needed.

David Taubman - One of the best experts on this subject based on the ideXlab platform.

  • multirate 3 d Subband Coding of video
    IEEE Transactions on Image Processing, 1994
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    We propose a full color video compression strategy, based on 3-D Subband Coding with camera pan compensation, to generate a single embedded bit stream supporting multiple decoder display formats and a wide, finely gradated range of bit rates. An experimental implementation of our algorithm produces a single bit stream, from which suitable subsets are extracted to be compatible with many decoder frame sizes and frame rates and to satisfy transmission bandwidth constraints ranging from several tens of kilobits per second to several megabits per second. Reconstructed video quality from any of these bit stream subsets is often found to exceed that obtained from an MPEG-1 implementation, operated with equivalent bit rate constraints, in both perceptual quality and mean squared error. In addition, when restricted to 2-D, the algorithm produces some of the best results available in still image compression. >

  • orientation adaptive Subband Coding of images
    IEEE Transactions on Image Processing, 1994
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    In the Subband Coding of images, directionality of image features has thus far been exploited very little. The proposed Subband Coding scheme utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates, At comparable bit rates, the subjective image quality obtained by our orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches such as the JPEG compression standard. >

  • orientation adaptive Subband Coding of images
    International Symposium on Circuits and Systems, 1993
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    A Subband Coding scheme is proposed. It utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates. At comparable bit rates, the subjective image quality obtained by the authors' orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches, such as the JPEG compression standard. >

  • ISCAS - Orientation adaptive Subband Coding of images
    1993 IEEE International Symposium on Circuits and Systems, 1
    Co-Authors: David Taubman, Avideh Zakhor
    Abstract:

    A Subband Coding scheme is proposed. It utilizes orientation of local image features to avoid the highly objectionable Gibbs-like phenomena observed at reconstructed image edges with conventional Subband schemes at low bit rates. At comparable bit rates, the subjective image quality obtained by the authors' orientation adaptive scheme is considerably enhanced over a conventional separable Subband Coding scheme, as well as other separable approaches, such as the JPEG compression standard. >

Han-mook Choi - One of the best experts on this subject based on the ideXlab platform.

  • Wavelets and perfect reconstruction Subband Coding with causal stable IIR filters
    IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1995
    Co-Authors: S. Basu, C.-h. Chiang, Han-mook Choi
    Abstract:

    We show for the first time that it is possible to have a large family of perfect reconstruction Subband Coding filter banks, which are causal and IIR both at the analysis and at the synthesis ends. Complete parametrization of such classes of filters leading to design methods are given. Parametrizations in frequency domain terms as well as in terms of state space descriptions of filters are provided for better numerical implementation of design methods. The development is valid for two-band as well as for multiband Subband Coding schemes. The iterated filter banks are shown to give rise to a new family of biorthogonal version of continuous wavelets, the scaled and dilated version of which represents arbitrary square integrable signals. Dilation factors larger than two are implicit in the development resulting from the fact that we consider multiband Subband Coding schemes. >

  • ISCAS - Causal IIR perfect reconstruction Subband Coding
    1993 IEEE International Symposium on Circuits and Systems, 1
    Co-Authors: S. Basu, C.-h. Chiang, Han-mook Choi
    Abstract:

    A class of perfect reconstruction (PR) Subband Coding schemes is proposed. It uses a bank of causal stable recursive filters both at the analysis and synthesis ends. A general method of parametrizing all causal stable infinite impulse response (IIR) perfect reconstruction filters is given. A complete description of the entire class of linear phase (unstable) IIR Subband Coding schemes is provided. >

  • Linear phase IIR wavelets and perfect reconstruction Subband Coding
    Proceedings of IEEE Systems Man and Cybernetics Conference - SMC, 1
    Co-Authors: S. Basu, Han-mook Choi
    Abstract:

    We classify and develop methods of generating a broad family of perfect reconstruction (PR), two-band Subband Coding schemes using linear phase (unstable) IIR filters. Subject to the condition that all four of the analysis and synthesis filter transfer functions have identical denominators, and some other mild technical restrictions, we show how to generate a large family of such Subband Coding schemes and associated scaling functions and smooth wavelets. >

R Kishimoto - One of the best experts on this subject based on the ideXlab platform.

  • a study on perfect reconstructive Subband Coding
    IEEE Transactions on Circuits and Systems for Video Technology, 1991
    Co-Authors: K Irie, R Kishimoto
    Abstract:

    The authors present a Subband Coding scheme which has the possibility of distortion-free enCoding. The Coding scheme, which divides input signals into frequency bands, lends itself to parallel implementation. Computer simulation is conducted using high-quality HDTV component signals. Quadrature mirror filters (QMFs) and short-kernel Subband filters are compared in terms of entropy (bit-per-pel) and signal-to-noise ratio. Simulation results show that the short-kernel filters can reduce the entropy while maintaining the original picture quality. The number of Subband-signal levels was found to be increased. Reduction of the number of signal levels by transformation during the filtering process is studied. From this study, new architectures for short-kernel filters are developed which can reduce the entropy of Subband signals better than conventional two-tap filters. >

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