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Image Processing, IEEE Transactions on

Issue 1 • Date Jan 1992

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Displaying Results 1 - 14 of 14
  • On the convergence of the generalized maximum likelihood algorithm for nonuniform image motion estimation

    Publication Year: 1992 , Page(s): 116 - 119
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    The generalized maximum likelihood algorithm is a powerful iterative scheme for waveform estimation. This algorithm seeks for the maximum likelihood estimates of the Karhunen-Loeve expansion coefficients of the waveform. The search for the maximum is performed by the steepest ascent routine. The objective of the paper is to obtain conditions that assure the stability in the mean for frame-to-frame... View full abstract»

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  • A comparison of deconvolution techniques for the ultrasonic nondestructive evaluation of materials

    Publication Year: 1992 , Page(s): 3 - 10
    Cited by:  Papers (17)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (544 KB)  

    Several major deconvolution techniques commonly used for seismic applications are studied and adapted for ultrasonic NDE (nondestructive evaluation) applications. Comparisons of the relative merits of these techniques are presented based on a complete set of simulations on some real ultrasonic pulse echoes. Methods that rely largely on a reflection seismic model, such as one-at-a-time L... View full abstract»

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  • Automatic assessment of constraint sets in image restoration

    Publication Year: 1992 , Page(s): 119 - 123
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (676 KB)  

    Constraints provide an important means of incorporating a priori information into the image restoration process. However, much of the information available for constructing constraints is of a tentative nature. If the validity of this tentative information can be assessed before it is incorporated into the solution, helpful constraints can be retained while harmful ones can be discarded. Cross val... View full abstract»

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  • New studies on adaptive predictive coding of images using multiplicative autoregressive models

    Publication Year: 1992 , Page(s): 106 - 111
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (852 KB)  

    The authors introduce two new one-dimensional multiplicative autoregressive (MAR) models for adaptive predictive coding of digitized images. The proposed scheme offers a number of advantages. These include easy implementability, a high signal-to-noise ratio at a moderate bit rate, and guaranteed stability of the predictive coder. Results of extensive experimental studies are presented View full abstract»

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  • Multiplication free vector quantization using L1 distortion measure and its variants

    Publication Year: 1992 , Page(s): 11 - 17
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    The author considers vector quantization that uses the L 1 distortion measure for its implementation. A gradient-based approach for codebook design that does not require any multiplications or median computation is proposed. Convergence of this method is proved rigorously under very mild conditions. Simulation examples comparing the performance of this technique with the LBG al... View full abstract»

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  • Identification and restoration of spatially variant motion blurs in sequential images

    Publication Year: 1992 , Page(s): 123 - 126
    Cited by:  Papers (17)  |  Patents (25)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (384 KB)  

    Sequential imaging cameras are designed to record objects in motion. When the speed of the objects exceeds the temporal resolution of the shutter, the image is blurred. Because objects in a scene are often moving in different directions at different speeds, the degradation of a recorded image may be characterized by a space-variant point spread function (PSF). The sequential nature of such images ... View full abstract»

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  • Adaptive entropy coded subband coding of images

    Publication Year: 1992 , Page(s): 31 - 48
    Cited by:  Papers (50)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1896 KB)  

    The authors describe a design approach, called 2-D entropy-constrained subband coding (ECSBC), based upon recently developed 2-D entropy-constrained vector quantization (ECVQ) schemes. The output indexes of the embedded quantizers are further compressed by use of noiseless entropy coding schemes, such as Huffman or arithmetic codes, resulting in variable-rate outputs. Depending upon the specific c... View full abstract»

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  • A system model and inversion for synthetic aperture radar imaging

    Publication Year: 1992 , Page(s): 64 - 76
    Cited by:  Papers (46)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    A system model and its corresponding inversion for synthetic aperture radar (SAR) imaging are presented. The system model incorporates the spherical nature of a radar's radiation pattern at far field. The inverse method based on this model performs a spatial Fourier transform (Doppler processing) on the recorded signals with respect to the available coordinates of a translational radar (SAR) or ta... View full abstract»

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  • A unified approach to lapped orthogonal transforms

    Publication Year: 1992 , Page(s): 111 - 116
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (404 KB)  

    The general conditions of exact reconstruction and a recursive design procedure for lapped orthogonal transform (LOT) with arbitrary length of overlapping are presented. It is shown that LOT can be realized with any standard block transform, discrete cosine transform (DCT), for example, and an additional processing. This processing must also satisfy the same conditions for exact reconfigurations a... View full abstract»

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  • Image coding based on a fractal theory of iterated contractive image transformations

    Publication Year: 1992 , Page(s): 18 - 30
    Cited by:  Papers (387)  |  Patents (13)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1984 KB)  

    The author proposes an independent and novel approach to image coding, based on a fractal theory of iterated transformations. The main characteristics of this approach are that (i) it relies on the assumption that image redundancy can be efficiently exploited through self-transformability on a block-wise basis, and (ii) it approximates an original image by a fractal image. The author refers to the... View full abstract»

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  • A stabilization algorithm for multichannel multidimensional linear prediction of imagery

    Publication Year: 1992 , Page(s): 101 - 106
    Request Permissions | Click to expandAbstract | PDF file iconPDF (556 KB)  

    The authors have investigated the stability problems observed in multichannel multidimensional linear predictive modeling of images. It is known that based on a positive definite autocorrelation matrix, singular values of the matrix Hi+1×Herm (δi+1) must lie inside the unit circle for a stable solution, where δi+1 is the normaliz... View full abstract»

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  • Image restoration using a modified Hopfield network

    Publication Year: 1992 , Page(s): 49 - 63
    Cited by:  Papers (83)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1352 KB)  

    A modified Hopfield neural network model for regularized image restoration is presented. The proposed network allows negative autoconnections for each neuron. A set of algorithms using the proposed neural network model is presented, with various updating modes: sequential updates; n-simultaneous updates; and partially asynchronous updates. The sequential algorithm is shown to converge to ... View full abstract»

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  • High resolution coherent source location using transmit/receive arrays

    Publication Year: 1992 , Page(s): 88 - 100
    Cited by:  Papers (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1004 KB)  

    A general approach to super resolution imaging of point sources using active arrays of transmit/receive elements is presented. The usual techniques of high resolution imaging using single transmitters and passive receive arrays fail in the presence of sets of coherent point sources, which often arise due to coherent multipath. However, data obtained from transmit/receive arrays may be arranged int... View full abstract»

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  • Backprojection by upsampled Fourier series expansion and interpolated FFT

    Publication Year: 1992 , Page(s): 77 - 87
    Cited by:  Papers (9)  |  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (760 KB)  

    A fast backprojection method through the use of interpolated fast Fourier transform (FFT) is presented. The computerized tomography (CT) reconstruction by the convolution backprojection (CBP) method has produced precise images. However, the backprojection part of the conventional CBP method is not very efficient. The authors propose an alternative approach to interpolating and backprojecting the c... 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