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IEEE Signal Processing Letters

Issue 6 • Date June 2000

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Displaying Results 1 - 11 of 11
  • A new image segmentation method based on human brightness perception and foveal adaptation

    Publication Year: 2000, Page(s):129 - 131
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    We propose an algorithm for adaptive image segmentation based on human psychovisual phenomena: visual perception-based segmentation. The new method can reliably segment poor quality images with low contrast and low SNRs. Due to its adaptability, it can be applied to a wide range of low quality images with different object sizes. In successful tests with ultrasound and flow field images that are no... View full abstract»

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  • A high quality 2 x image interpolator

    Publication Year: 2000, Page(s):132 - 134
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB)

    In this paper, we present an innovative interpolator that performs high quality 2/spl times/interpolation on both synthetic and real world images. Its structure, which is based on a rational operator, provides edge-sensitive data interpolation so that sharp- and artifacts-free images are obtained at a reasonable computational cost. View full abstract»

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  • A segmental-feature HMM for speech pattern modeling

    Publication Year: 2000, Page(s):135 - 137
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB)

    In this letter, we propose a new trajectory model for characterizing segmental features and their interaction based upon a general framework of hidden Markov models. Each segment, a sequence of frame vectors, is represented by a trajectory of observed vector sequences. This trajectory replaces the frame features in the segment and becomes the input of the segmental hidden Markov models (HMM's). In... View full abstract»

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  • The spatial ambiguity function and its applications

    Publication Year: 2000, Page(s):138 - 140
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (50 KB)

    This letter introduces the spatial ambiguity functions (SAFs) and discusses their applications to direction finding and source separation problems. We emphasize two properties of SAFs that make them an attractive tool for array signal processing. View full abstract»

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  • The binDCT: fast multiplierless approximation of the DCT

    Publication Year: 2000, Page(s):141 - 144
    Cited by:  Papers (68)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    This paper presents a family of fast biorthogonal block transforms called binDCT that can be implemented using only shift and add operations. The transform is based on a VLSI-friendly lattice structure that robustly enforces both linear phase and perfect reconstruction properties. The lattice coefficients are parameterized as a series of dyadic lifting steps providing fast, efficient, in place com... View full abstract»

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  • The LiftLT: fast-lapped transforms via lifting steps

    Publication Year: 2000, Page(s):145 - 148
    Cited by:  Papers (23)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    This paper introduces a class of multiband linear phase-lapped biorthogonal transforms with fast, VLSI-friendly implementations via lifting steps called the LiftLT. The transform is based on a lattice structure that robustly enforces both linear phase and perfect reconstruction properties. The lattice coefficients are parameterized as a series of lifting steps, providing fast, efficient, in-place ... View full abstract»

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  • Closed-form design and efficient implementation of generalized maximally flat half-band FIR filters

    Publication Year: 2000, Page(s):149 - 151
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (55 KB)

    In this letter, a closed-form expression for the impulse response of the generalized half-band (HB) maximally flat (MF) FIR filters is obtained by solving the linear equations of the MF conditions. Based on the resultant impulse responses, an efficient implementation structure is derived. The dynamic range of the multipliers of the new structure is shown to be greatly reduced in comparison to the ... View full abstract»

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  • Wideband direction-of-arrival estimation of multiple chirp signals using spatial time-frequency distributions

    Publication Year: 2000, Page(s):152 - 155
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    The recently developed concept of narrowband spatial time-frequency distributions (STFDs) is extended to the wide-band case. A new STFD-based wideband root-MUSIC estimator is proposed. This technique employs an extended coherent signal-subspace (CSS) principle involving coherent averaging over a pre-selected set of time-frequency points rather than the conventional frequency-only averaging procedu... View full abstract»

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  • Instantaneous kurtosis

    Publication Year: 2000, Page(s):156 - 159
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (86 KB)

    We introduce the concept of the instantaneous kurtosis of a signal. Using the general approach of Cohen (1993), we obtain an explicit expression in terms of the amplitude and phase of the signal. The idea and results are analogous to those of the instantaneous frequency and the instantaneous bandwidth of a signal, which are low-order conditional moments of the time-varying spectral density of the ... View full abstract»

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  • Estimation of a Bernoulli parameter p from imperfect trials

    Publication Year: 2000, Page(s):160 - 163
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    Imperfect Bernoulli trials arise when the outcome of a Bernoulli experiment is not known with certainty. In signal processing, we often need to estimate a probability of occurrence p of an event from imperfect Bernoulli trials. A typical example is the estimation of the probability of a signal being present in noisy data. In his famous essay, Bayes solved the same problem but for perfect trials. I... View full abstract»

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  • Two-dimensional lattice linear prediction parameter estimation method and fast algorithm

    Publication Year: 2000, Page(s):164 - 168
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    This paper presents an extension of the one-dimensional (1-D) lattice (reflection coefficient) technique of linear prediction parameter estimation, first popularized by Burg, to the two-dimensional (2-D) case. The resulting fast recursive 2-D algorithm is a significant computational simplification over and an estimation improvement on previous attempts to extend the 1-D Burg linear prediction algo... View full abstract»

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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu