Now showing items 198-217 of 508

  • INTERFACIAL TENSION MEASUREMENT BY SESSILE DROP USING DIGITAL IMAGE PROCESSING 

    ELDER, JAMES EDWARD (1987)
    In enhanced oil recovery the displacement of oil is most effective at low interfacial tensions, usuall below 10$\sp{-2}$ dyne/cm. This condition can be achieved by surfactant or chemical flooding but requires accurate ...
  • Interpolation and Denoising of Nonuniformly Sampled Data using Wavelet-domain Processing 

    Choi, Hyeokho; Baraniuk, Richard G. (1999-03-01)
    In this paper, we link concepts from nonuniform sampling, smoothness function spaces, interpolation, and denoising to derive a suite of multiscale, maximum-smoothness interpolation algorithms. We formulate the interpolation ...
  • An introduction to multifractals 

    Riedi, Rudolf H. (1997-01-15)
    This is an easy read introduction to multifractals. We start with a thorough study of the Binomial measure from a multifractal point of view, introducing the main multifractal tools. We then continue by showing how to ...
  • Inverse Measures, the Inversion formula, and Discontinuous Multifractals 

    Mandelbrot, Benoit; Riedi, Rudolf H. (1997-01-20)
    The present paper is part I of a series of three closely related papers in which the inverse measure m' of a given measure m on [0,1] is introduced. In the first case discussed in detail, both these measures are multifractal ...
  • Inversion Formula for Continuous Multifractals 

    Riedi, Rudolf H.; Mandelbrot, Benoit (1997-01-20)
    In a previous paper the authors introduced the inverse measure <i>µ</i><sup>â  </sup> of a probability measure <i>µ</i> on [0,1]. It was argued that the respective multifractal spectra are linked by the 'inversion formula' ...
  • Joint Compression and Speckle Reduction of SAR Images using Embedded Zerotree Models 

    Odegard, Jan E.; Guo, Haitao; Burrus, C. Sidney; Baraniuk, Richard G. (1996-03-01)
    We propose a new method for speckle reduction in synthetic aperture radar (SAR) imagery based on the embedded zerotree image compression algorithm. This new approach to denoising is inspired by the realization that the ...
  • Joint Detection Strategies for Orthogonal Frequency Division Multiplexing 

    Ahmed, Nadeem (2000-04-20)
    Traditional OFDM implementations use conventional Fourier filters for data modulation, via the IFFT operation. Much research suggests wavelet based OFDM provides performance gains, due to superior spectral containment ...
  • Joint Distributions for Arbitrary Variables 

    Cohen, Leon; Baraniuk, Richard G. (1994-10-01)
    We compare the methods of Cohen (1971) and of Baraniuk and Jones (see Proc. IEEE ICASSP-93, p.320-323, 1993) for obtaining joint distributions for arbitrary variables. We show that the two methods produce identical results ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1996-09-01)
    The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1998-10-01)
    In this paper, we propose a simple framework for studying certain distributions of variables beyond time-frequency and time-scale. When applicable, our results turn the theory of joint distributions of arbitrary variables ...
  • Joint Distributions of Arbitrary Variables Made Easy 

    Baraniuk, Richard G. (1998-09-01)
    The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
  • Joint signaling techniques and spectral optimization for symmetric bit-rate communication over self-NEXT-dominated channels 

    Gaikwad, Rohit; Baraniuk, Richard G. (2004-07-01)
    We present a framework for maximizing the capacity of symmetric bit-rate communication services dominated by Gaussian crosstalk, in particular, digital subscriber line (DSL) services. We solve for optimal transmit power ...
  • Joint Signaling Techniques for Crosstalk-Dominated Communication Channels 

    Gaikwad, Rohit; Baraniuk, Richard G. (1999-12-01)
    We present a framework for maximizing the capacity (or bit rate) of symmetric bit rate communication services dominated by crosstalk, in particular digital subscriber line (DSL) services. We assume the DSL channel is a ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Baraniuk, Richard G. (2006-06-01)
    We routinely encounter digital color images that were previously compressed using the Joint Photographic Experts Group (JPEG) standard. En route to the image's current representation, the previous JPEG compression's various ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Baraniuk, Richard G. (2003-09-01)
    We routinely encounter digital color images that were previously JPEG-compressed. We aim to retrieve the various settings - termed JPEG compression history (CH) - employed during previous JPEG operations. This information ...
  • JPEG Compression History Estimation for Color Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Dash, Sanjeeb; Baraniuk, Richard G. (2005-07-01)
    We routinely encounter digital color images that were previously JPEG-compressed. En route to the image's current representation, the previous JPEG compression's various settings&mdash;termed its JPEG compression history ...
  • Lattice Algorithms for Compression Color Space Estimation in JPEG Images 

    Neelamani, Ramesh; de Queiroz, Ricardo; Baraniuk, Richard G. (2001-08-01)
    JPEG (Joint Photographic Experts Group) is an international standard to compress and store digital color images [5]. Given a color image that was previously JPEG-compressed in some hidden color space, we aim to estimate ...
  • Learning minimum volume sets with support vector machines 

    Davenport, Mark A.; Baraniuk, Richard G.; Scott, Clayton D. (2006-09-01)
    Given a probability law P on d-dimensional Euclidean space, the minimum volume set (MV-set) with mass beta , 0 < beta < 1, is the set with smallest volume enclosing a probability mass of at least beta. We examine the use ...
  • Lifting Construction of Non-Linear Wavelet Transforms 

    Claypoole, Roger L.; Baraniuk, Richard G.; Nowak, Robert David (1998-10-01)
    This paper analyzes non-linear wavelet transforms using the lifting construction. The lifting construction exploits a spatial-domain, prediction-error interpretation of the wavelet transform and provides a powerful framework ...
  • A Limitation of the Kernel Method for Joint Distributions of Arbitrary Variables 

    Baraniuk, Richard G. (1996-02-01)
    Recently, Cohen has proposed a construction for joint distributions of arbitrary physical quantities, in direct generalization of joint time-frequency representations. Actually this method encompasses two approaches, one ...