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IEEE Transactions on Image Processing

Issue 2 • Apr 1993

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Displaying Results 1 - 14 of 14
  • A new zero-crossing-based discontinuity detector

    Publication Year: 1993, Page(s):265 - 268
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    General zero-crossing-based discontinuity detectors in two dimensions, which include Marr-Hildreth (1980), residual, difference of Gaussians, and other detectors as special cases, are discussed. Mathematical justification for this class of detectors is presented. An optimal detector that maximizes the signal-to-noise ratio is derived. Preliminary experimental results for real images are reported View full abstract»

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  • Morphological grayscale reconstruction in image analysis: applications and efficient algorithms

    Publication Year: 1993, Page(s):176 - 201
    Cited by:  Papers (840)  |  Patents (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3416 KB)

    Two different formal definitions of gray-scale reconstruction are presented. The use of gray-scale reconstruction in various image processing applications discussed to illustrate the usefulness of this transformation for image filtering and segmentation tasks. The standard parallel and sequential approaches to reconstruction are reviewed. It is shown that their common drawback is their inefficienc... View full abstract»

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  • Color edge detection using vector order statistics

    Publication Year: 1993, Page(s):259 - 264
    Cited by:  Papers (84)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A method is proposed whereby a color image is treated as a vector field and the edge information carried directly by the vectors is exploited. A class of color edge detectors is defined as the minimum over the magnitudes of linear combinations of the sorted vector samples. From this class, a specific edge detector is obtained and its performance characteristics studied. Results of a quantitative e... View full abstract»

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  • Blur identification by residual spectral matching

    Publication Year: 1993, Page(s):141 - 151
    Cited by:  Papers (59)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (924 KB)

    The estimation of the point spread function (PSF) for blur identification, often a necessary first step in the restoration of real images, method is presented. The PSF estimate is chosen from a collection of candidate PSFs, which may be constructed using a parametric model or from experimental measurements. The PSF estimate is selected to provide the best match between the restoration residual pow... View full abstract»

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  • Modeling and subjective assessment of cell discard in ATM video

    Publication Year: 1993, Page(s):212 - 222
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1164 KB)

    Measurements of subjective picture impairment as a function of network loading in a simulated ATM network are reported. The simulation indicated that cells tend to be discarded in bursts, the frequency and severity of which can be related to the loading by a threshold model. The effect of the discards on broadcast-style video, coded using a single-layer H.261-type method, was found to be a functio... View full abstract»

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  • Best wavelet packet bases in a rate-distortion sense

    Publication Year: 1993, Page(s):160 - 175
    Cited by:  Papers (481)  |  Patents (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1480 KB)

    A fast rate-distortion (R-D) optimal scheme for coding adaptive trees whose individual nodes spawn descendents forming a disjoint and complete basis cover for the space spanned by their parent nodes is presented. The scheme guarantees operation on the convex hull of the operational R-D curve and uses a fast dynamic programing pruning algorithm to markedly reduce... View full abstract»

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  • On the accuracy of PSF representation in image restoration

    Publication Year: 1993, Page(s):252 - 259
    Cited by:  Papers (27)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1416 KB)

    Point spread function (PSF) models derived from physical optics provide a more accurate representation of real blurs than simpler models based on geometrical optics. However, the physical PSF models do not always result in a significantly better restoration, due to the coarse sampling of the recording device and insufficiently high signal-to-noise ratio (SNR) levels. Low recording resolutions resu... View full abstract»

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  • Signal recovery by best feasible approximation

    Publication Year: 1993, Page(s):269 - 271
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The objective of set theoretical signal recovery is to find a feasible signal in the form of a point in the intersection of S of sets modeling the information available about the problem. For problems in which the true signal is known to lie near a reference signal r, the solution should not be any feasible point but one which best approximates r, i.e., a projection of <... View full abstract»

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  • Restoration of blurred star field images by maximally sparse optimization

    Publication Year: 1993, Page(s):202 - 211
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    The problem of removing blur from, or sharpening, astronomical star field intensity images is discussed. An approach to image restoration that recovers image detail using a constrained optimization theoretic approach is introduced. Ideal star images may be modeled as a few point sources in a uniform background. It is argued that a direct measure of image sparseness is the appropriate optimization ... View full abstract»

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  • Complete Gabor transformation for signal representation

    Publication Year: 1993, Page(s):152 - 159
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Properties of the Gabor transformation used for image representation are discussed. The properties can be expressed in matrix notation, and the complete Gabor coefficients can be found by multiplying the inverse of the Gabor (1946) matrix and the signal vector. The Gabor matrix can be decomposed into the product of a sparse constant complex matrix and another sparse matrix that depends only on the... View full abstract»

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  • Deblurring of bilevel waveforms

    Publication Year: 1993, Page(s):223 - 235
    Cited by:  Papers (20)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    An algorithm for processing closely spaced edges and accurately restoring their locations is presented. The convolution distortion model is based on interacting edges. The restoration algorithm takes three edges as input and forces the effects of two of them to cancel each other. Thus the third edge appears to be isolated and is located using a traditional edge detector. Experiments on bar code wa... View full abstract»

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  • Adaptive mathematical morphology for range imagery

    Publication Year: 1993, Page(s):272 - 275
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The application of adaptive (i.e., data-dependent) mathematical morphology techniques to range imagery, i.e., the use of structuring elements (SEs) that automatically adjust to the gray-scale values in a range image in order to deal with features of known physical sizes, is discussed. The technique is applicable to any type of image for which the distance to a scene element is available for each p... View full abstract»

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  • Nonuniform image motion estimation in reduced coefficient transformed domains

    Publication Year: 1993, Page(s):236 - 246
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2416 KB)

    The transformed domain maximum likelihood (TDML) algorithm for image motion estimation is presented. This algorithm finds a solution which maximizes a log-likelihood function using a steepest ascent scheme. Important characteristics of the algorithm are the inclusion of noise in the signal model, the consideration of motion as a nonuniform process, and calculation of convergence parameters by mean... View full abstract»

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  • An error-weighted regularization algorithm for image motion-field estimation

    Publication Year: 1993, Page(s):246 - 252
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1668 KB)

    Local motion measurement errors are used to guide the global smoothing process in order to preserve motion-field discontinuities. A field-smoothing algorithm based on matching-error weighting is proposed. The added computation is minimal, since it uses byproducts of the local measurement process. The error-weighting functional provides significantly improved motion field estimates, as measured by ... View full abstract»

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Aims & Scope

IEEE Transactions on Image Processing focuses on signal-processing aspects of image processing, imaging systems, and image scanning, display, and printing.

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Meet Our Editors

Editor-in-Chief
Scott Acton
University of Virginia
Charlottesville, VA, USA
E-mail: acton@virginia.edu 
Phone: +1 434-982-2003