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IWISPA 2000. Proceedings of the First International Workshop on Image and Signal Processing and Analysis. in conjunction with 22nd International Conference on Information Technology Interfaces. (IEEE

14-15 June 2000

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  • IWISPA 2000. Proceedings of the First International Workshop on Image and Signal Processing and Analysis. in conjunction with 22nd International Conference on Information Technology Interfaces. (IEEE Cat. No.00EX437)

    Publication Year: 2000
    Request permission for commercial reuse | PDF file iconPDF (353 KB)
    Freely Available from IEEE
  • Contributors

    Publication Year: 2000, Page(s):xi - xii
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    Freely Available from IEEE
  • Sparse vector linear prediction with near-optimal matrix structures

    Publication Year: 2000, Page(s):235 - 240
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    Vector linear prediction (VLP) is frequently used in speech and image coding. This paper addresses a technique of reducing the complexity of VLP, named the sparse VLP (sVLP), by decreasing the number of nonzero elements of prediction matrices used for prediction. The pattern of zero and nonzero elements in a matrix, i.e. the matrix structure, is not restricted in the design procedure but is a resu... View full abstract»

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  • Spatio-temporal image segmentation using optical flow and clustering algorithm

    Publication Year: 2000, Page(s):63 - 68
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Image segmentation is an important and challenging problem in image analysis. Segmentation of moving objects in image sequences is even more difficult and computationally expensive. In this work we propose a technique for spatio-temporal segmentation of medical image sequences based on clustering in the feature vector space. The motivation for the spatio-temporal approach is the fact that motion i... View full abstract»

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  • Restoration of images blurred by circular motion

    Publication Year: 2000, Page(s):53 - 60
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The problem of restoring images blurred by circular motion is considered. In order to simplify the process of deblurring, the original image in the (x,y) plane is transformed into polar plane (p,φ) . This simplifies the blur model, resulting in one-dimensional integration View full abstract»

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  • Analysis of different low complexity nonlinear filters for acoustic echo cancellation

    Publication Year: 2000, Page(s):261 - 266
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Linear filters are often employed in most signal processing applications. As a matter of fact, they are well understood within a uniform theory of discrete linear systems. However, many physical systems exhibit some nonlinear behaviour, and in certain situations linear filters perform poorly. One case is the problem of acoustic echo cancellation, where the digital filter employed has to identify a... View full abstract»

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  • Edge-preserving neural network model for image restoration

    Publication Year: 2000, Page(s):29 - 34
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents a hybrid approach for image restoration with edge-preserving regularization, subband coding, and artificial neural network. The edge information is extracted from the source image as a priori knowledge to recover the details and reduce the ringing artifact of the subband coded image. The multilayer perception model is employed to implement the restoration process. A comparative... View full abstract»

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  • Local similarity measures for multimodal image matching

    Publication Year: 2000, Page(s):81 - 86
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    In this paper we focus on local similarity measures based on Shannon entropy which can be used for multimodal image matching employing deformations. The advantage of our approach is that global similarity or similarity of a larger image region can be computed from the similarities of its constitutive parts or individual voxels. We also discuss the interpolation artefacts in entropy based similarit... View full abstract»

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  • Generalization of the Fourier domain watermarking to the space/spatial-frequency domain

    Publication Year: 2000, Page(s):47 - 51
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A generalization of the Fourier domain watermarking is proposed. It has been done using joint space/spatial-frequency analysis and projections of the Wigner distribution, the two-dimensional Radon-Wigner distribution. A simple and numerically efficient algorithm for watermark embedding and detection is presented. The theory is tested on several test images with various attacks, including filtering... View full abstract»

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  • Application of convolution to estimation of cell loss rate in ATM networks

    Publication Year: 2000, Page(s):255 - 260
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The dominant problems in ATM networks are network control and network resource allocation. An efficient resource allocation to each traffic source is an extremely complex task. Network must be managed in real-time in order to avoid congestion. Network congestion requires admission control that in turn requires traffic measurements. We propose a method for the estimation of a cell loss rate in an A... View full abstract»

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  • Polynomial filters for image and video processing

    Publication Year: 2000, Page(s):15 - 26
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    We review the class of polynomial filters and their extensions, first introducing the Volterra (1887, 1913, 1959) series expansion that is at the basis of such filters. The main concepts and properties are given with reference to 1-D signals, while extensions to multidimensional (M-D) signals are then considered. Applications of such filters to image and video processing are also shown View full abstract»

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  • Impedance tapering effects on “low-Q” SAB band-pass active-RC filter

    Publication Year: 2000, Page(s):229 - 234
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The design procedure of low-sensitivity active resistance-capacitance (RC) allpole filters, using impedance tapering, has already been published. The low-sensitivity filter sections already described in publications are class 4 (TT-SABB) Sallen and Key (1955) sections. In this paper class 3 (SAB) sections for low pole-Q realization are considered. Impedance tapering is applied on L-sections, which... View full abstract»

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  • Detection and classification of MS using magnetisation transfer ratio images

    Publication Year: 2000, Page(s):127 - 132
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Principal component (PCA) and multiple discriminant analysis (MDA) are applied to magnetization transfer ratio (MTR) images in multiple sclerosis (MS). PCA and MDA are used to characterise subtle diffuse changes in MS. PCA is applied to MTR histograms to identify regions of significant variation. These areas are indicated as possible lesion areas. We compare two classifiers to recognise difference... View full abstract»

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  • Environment based clustering. A new approach

    Publication Year: 2000, Page(s):75 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    There are a variety of problems that require an automatic classification of a set of data. In this sense, clustering techniques have been widely applied, since they are known for forming classes or groups using a predefined similarity measure. This paper defines a new method which, as opposed to the solutions found so far, does not require any previous information about the data to be classified. ... View full abstract»

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  • Prediction-based time-varying filtering for speech enhancement in cellular telephony

    Publication Year: 2000, Page(s):273 - 278
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The excitation signal contained in a speech signal and the vocal tract parameters determining the spectral envelope can be extracted by linear prediction (LP). In order to enhance noisy speech signals, time-varying filtering, based on the S-method as a time-frequency analysis tool, is applied to the excitation signal and to the spectral envelope in parallel. This approach is tested with noisy spee... View full abstract»

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  • Simultaneous estimation of PSF and global frame shifts at lower S/N ratios

    Publication Year: 2000, Page(s):41 - 46
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    We present new algorithm for simultaneous estimation of degradation PSF and global frame shifts, using degraded frames only. Algorithm is based on the singular value decomposition (SVD). Separable approximation is supposed for the point spread function (PSF). It has been shown that frame shifts cause same shifts in the corresponding singular vectors. This fact is used in the spatial domain for PSF... View full abstract»

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  • Filters with minimum impulse response moment

    Publication Year: 2000, Page(s):247 - 252
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The lowpass systems with minimum second order moment of the impulse response are presented. Therefore the obtained systems have the largest possible energy concentration in time. The optimization of the transfer function parameters is carried out for the functions ranging from the second to the tenth order, with finite zeros. The optimum pole-zero positions suitable for filter design are given tog... View full abstract»

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  • Digital visual information processing: adding vision and graphics

    Publication Year: 2000, Page(s):3 - 13
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1164 KB)

    Models of the real world are at least 3-dimensional and require the technologies of image processing and computer graphics. We see the processing of images, be they of the real world or of models in a computer, as one and the same basic technology, namely “digital visual information processing”. This paper seeks to illustrate and justify this point-of-view by means of examples taken mo... View full abstract»

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  • A level sets approach to determining brain region connectivity

    Publication Year: 2000, Page(s):145 - 150
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A method is presented for determining likely paths of connection between regions of the brain using MR diffusion tensor information. Level set theory, applied using fast marching methods is used to generate 3-D time of arrival maps, from which connection paths between brain regions may be defined by identifying paths that minimise connection cost. Maps of the likelihood of connection between brain... View full abstract»

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  • Design of two-channel low-delay FIR filter banks using constrained optimization

    Publication Year: 2000, Page(s):223 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    This paper shows the efficiency of using constrained optimization for designing two-channel low-delay finite impulse response filter banks. The filter banks under consideration are quadrature mirror filter (QMF) banks and perfect reconstruction (PR) biorthogonal filter banks. The design problems for both types of banks are stated as constrained minimization problems in forms that enables us to min... View full abstract»

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  • Coding of arbitrarily shaped objects using pace code

    Publication Year: 2000, Page(s):119 - 124
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Pace code, a new technique for the shape coding in object-based image technology is presented in this article. It is a lossless, contour-based scheme in which contour pels on the shape contour curve are encoded directly. Similar to the well-known chain code, our method encodes the spatial relation between pels on the neighboring shape contour curve, but it uses a concept called pace which records ... View full abstract»

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  • Local thresholding classified vector quantization with memory reduction

    Publication Year: 2000, Page(s):197 - 202
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A new memory reduction method for classified vector quantization (CVQ) is presented. Symmetry reflection, rotation and inversion of edge subimages are used to join appropriate edge classes thus reducing the memory requirements for edge codebooks by 8(4) times for the classifier used in this paper. Besides the memory reduction, our method generates the more robust codebooks thus increasing the PSNR... View full abstract»

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  • Background-foreground segmentation based on dominant motion estimation and static segmentation

    Publication Year: 2000, Page(s):69 - 74
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    This paper addresses the problem of image segmentation using motion and luminance information. We use the dominant motion model to calculate both the background and foreground motion in a robust estimation framework and then combine it with the result of static segmentation using the watershed algorithm to segment the foreground from the background. In this paper, the previous pixel-based (or over... View full abstract»

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  • Filter design for the conjugate OFDM-OQAM system

    Publication Year: 2000, Page(s):267 - 272
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We present a filter design procedure for a novel multicarrier modulation scheme, the conjugate OFDM-OQAM, which only requires amplitude tailoring of the prototype filter frequency response, regardless of its phase. It achieves good interchannel interference (ICI) and intersymbol interference (ISI) rejection, while still maintaining maximum spectral efficiency and a good time-frequency localization... View full abstract»

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  • Reconstruction of astronomical images from low-photon image sequence: study for Gaussian displacements

    Publication Year: 2000, Page(s):35 - 40
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    In the restoration of images from low photon-level data, an estimate of the reconstructed image is often carried out in the general framework of Bayesian statistical estimation. We have developed a new method (Guillaume et al. 1998) for image reconstruction from a sequence of low photon-level and translated astronomical images. We research the maximum a posteriori estimate of the translations to r... View full abstract»

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