Proceedings of 13th International Conference on Digital Signal Processing

2-4 July 1997

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  • Proceedings of 13th International Conference on Digital Signal Processing

    Publication Year: 1997
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    Freely Available from IEEE
  • Author index

    Publication Year: 1997, Page(s):xliii - xlviii
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    Freely Available from IEEE
  • Weighted least squares design of FIR filters subject to magnitude and phase constraints

    Publication Year: 1997, Page(s):451 - 454 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper proposes an algorithm for the design of FIR digital filters with arbitrary magnitude and phase responses. The designed filters are optimum according to a weighted least squared frequency domain error criterion with constraints on the resulting magnitude and phase responses. This optimality criterion offers more flexibility than pure least squares or Chebyshev criteria. These widely used... View full abstract»

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  • Directional SVD: a new technique for designing 2-D diamond halfband filters and filter banks

    Publication Year: 1997, Page(s):455 - 458 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    We combine the notion of generalized non-separability and the SVD for designing the class of 2D kernels which satisfies the diamond halfband condition. Such kernels are used in video sampling structure conversion and also for designing nonseparable 2D perfect reconstruction filter banks. The new design technique is called directional SVD because it performs the decomposition along directions which... View full abstract»

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  • Design of 3-D noncausal filters with small roundoff noise and no overflow oscillations

    Publication Year: 1997, Page(s):459 - 462 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (670 KB)

    The contribution of this paper consists of two parts. First, an invertible mapping technique is presented for 3-D digital system design, and it is applied to approximate 3-D noncausal filters in the spatial domain. Secondly, an algorithm is proposed for obtaining a structure for 3-D IIR filters with small roundoff noise and no overflow oscillations. The design of noncausal filters can be carried o... View full abstract»

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  • A new class of approximately linear phase filters

    Publication Year: 1997, Page(s):467 - 470 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    This paper presents a class of infinite impulse response (IIR) filters which have approximately linear phase response in their pass bands. The new filters provide better magnitude response although slightly worse phase linearity for a given order and transition bandwidth than previous designs. They can then be used as an alternative to those designs when we want some degree of phase linearity but ... View full abstract»

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  • Designing FIR perfect reconstruction systems given several of the analysis and synthesis filters

    Publication Year: 1997, Page(s):471 - 474 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB)

    This paper deals with the problem of designing an N-band maximally-decimated FIR analysis/synthesis system with the perfect-reconstruction property, when K of the filters in both the analysis and synthesis banks are selected beforehand. An algorithm for computing the N-K unknown analysis and synthesis filters is given and the solution set is completely parametrized. The parametrization leads to a ... View full abstract»

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  • Progressive image transmission by linear quadtree coding and wavelet transformation

    Publication Year: 1997, Page(s):475 - 478 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Progressive image transmission allows an approximate image to be built quickly and the details to be transmitted progressively through several stages over the channel. This technique appears very useful for picture communication over slow channels. This paper proposes to use linear quadtree coding combined with wavelet theory as well as other methods to achieve a progressive image transmission sys... View full abstract»

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  • A wavelet-based approach to the estimation of the Hurst parameter for self-similar data

    Publication Year: 1997, Page(s):479 - 482 vol.2
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    In this paper we analyse a wavelet based method for the estimation of the Hurst parameter of synthetically-generated self-similar traces, widely used in a great variety of applications, ranging from computer graphics to parsimonious traffic modelling in broadband networks. The aim of this work is to point out the efficiency of multiresolution schemes in the analysis of fractal processes, character... View full abstract»

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  • Subband domain Wiener filtering

    Publication Year: 1997, Page(s):483 - 486 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    A general FIR solution of subband domain Wiener filtering is derived. We observe some interesting properties of the optimal filters and the solution is generalized to the multi-scale subband domain which paves a way for the study of wavelet domain Wiener filtering. Unlike the unitary transform domain Wiener filtering, the performance of the general subband Wiener filter depends on the choice of th... View full abstract»

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  • A single layer linear feedforward neural network for signal estimation in the wavelet domain

    Publication Year: 1997, Page(s):487 - 490 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    A model of adaptive signal estimation in the presence of noise is proposed using the wavelet transform and single layer linear feedforward neural networks. The networks successively estimate the residual of the approximations (details) of the input at different scales from coarse scales (low frequencies) to fine scales by minimizing the error of each channel of the wavelet transform separately. Si... View full abstract»

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  • Symbolic analysis of quantization errors in transform and subband coders

    Publication Year: 1997, Page(s):491 - 494 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1303 KB)

    In general, transform and subband coders are designed so as to achieve perfect reconstruction in the ideal case. Nevertheless, in a real system there are many disturbing effects such as quantization in digital filters, intermediate coding stages, and noisy transmission channels which prevent perfect reconstruction. Usually, these effects are either neglected or modelled in a very simple way. In co... View full abstract»

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  • Robust watermarking of still images for copyright protection

    Publication Year: 1997, Page(s):499 - 502 vol.2
    Cited by:  Papers (10)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (655 KB)

    Digital watermarking has been proposed as a means to protect the copyright of multimedia data in a networked environment, since it makes it possible to tightly embed a code into a digital document allowing the identification of the data owner. A new watermarking system for digital images is presented: the method embeds a sequence of random real numbers in a selected set of DCT coefficients. Embedd... View full abstract»

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  • Enhancement of the Horn and Schunck optic flow algorithm by means of median filters

    Publication Year: 1997, Page(s):503 - 506 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    For optic flow computation the Horn and Schunck (1980) algorithm is one of the most used and powerful. Some drawbacks are, nevertheless, intrinsically related to the approach that it used. A smoothness constraint is imposed to the flow field in order to produce a solution. This constraint causes the estimated field to be incorrect where motion discontinuities are present. The weight of this smooth... View full abstract»

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  • Farsi handwritten character recognition with moment invariants

    Publication Year: 1997, Page(s):507 - 510 vol.2
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (289 KB)

    This paper introduces an experimental evaluation of the effectiveness of utilizing various moments as pattern features in recognition of the handwritten Farsi characters. The moments that have been used are Zernike moments, pseudo Zernike moments, and Legendre moments. We have used an unsupervised neural network (ART2) for this application, so that the clusters are formed only based on inherent pr... View full abstract»

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  • The first order absolute moment in low-level image processing

    Publication Year: 1997, Page(s):511 - 514 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (543 KB)

    The first order absolute moment provides a ridge map similar to the one provided by the GoG (gradient of Gaussian) filter. However, unlike the GoG filter, the first order absolute moment provides ridges at both edges and lines and gives rise to local extrema of the ridges at line endings, corners and junctions. Furthermore, a class of filters is obtained by introducing three low-pass filters at th... View full abstract»

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  • Automatic face image recognition: an accurate eye location procedure

    Publication Year: 1997, Page(s):515 - 519 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (934 KB)

    An accurate eye location procedure is pre-requisite of automatic face location. A procedure is proposed at this regard. It requires an initial approximate location of the eyes by extracting the face from the image to be examined and by modeling its shape. Then a detailed description of the eye shape is obtained in the form of a labeled point model. The labels represent the local spatial informatio... View full abstract»

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  • A symmetry-based approach to facial features extraction

    Publication Year: 1997, Page(s):521 - 525 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Face recognition technology (FRT) is gaining increasing interest in a large number of application fields. The article deals with a new approach to this problem, that exploits symmetry characteristics of the human visage to extract a set of significant features for the detection task. The developed methods give a very good percentage of success in the identification of facial elements, with the adv... View full abstract»

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  • Grouping of planar structures for object reconstruction

    Publication Year: 1997, Page(s):527 - 530 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    This paper presents a strategy to formulate 3D structure hypotheses without a-priori knowledge about the objects represented in the scene. The shape of 2D structures that have a high probability of belonging to the visible faces of objects is used to formulate hypotheses about the face orientation and 3D geometrical grouping of these structures is used to reconstruct the objects. View full abstract»

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  • Image coding using data-dependent triangulation

    Publication Year: 1997, Page(s):531 - 534 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    An image coding technique that combines irregular subsampling and triangulation is proposed. First, a Delaunay triangulation is constructed over a set of visually significant sampling points selected incrementally as the triangulation progresses. Then a data-dependent triangulation is generated, starting from the Delaunay triangulation, by a series of edge swaps based on the quality of the approxi... View full abstract»

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  • A novel image recognition technique for 3-dimensional objects

    Publication Year: 1997, Page(s):535 - 538 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The need for better image processing has lead to the emergence of many techniques, which aim to achieve faster and cheaper operations. Multiscale analysis for edge detection is a powerful approach to image recognition. However, this approach suffers huge computational and time cost which, consequently, jeopardise its efficiency. This paper presents a new technique in image processing that aims to ... View full abstract»

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  • Lie group transformations of objects in images

    Publication Year: 1997, Page(s):539 - 542 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    If an image of an object such as an aeroplane is rotated in the plane of the image, and if some feature space representation is chosen which is a projection onto some set of smooth functions, as in the calculation of moments, wavelets or Fourier coefficients, then each angle defines a point in the feature space. Providing the object is not symmetric under rotation, this defines a one-one map (an i... View full abstract»

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  • Transient simulation of nonuniform multiconductor transmission lines by MD wave digital techniques

    Publication Year: 1997, Page(s):543 - 546 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB)

    The application of multidimensional (MD) wave digital filter (WDF) techniques to the simulation of transients on nonuniform coupled transmission lines is presented. Previously, MD WDF principles have been proposed for the numerical solution of partial differential equations (PDEs) in a number of publications. Among these the problem of simulating transients for single and multiconductor transmissi... View full abstract»

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  • Fast filtering technique for HREM image analysis

    Publication Year: 1997, Page(s):547 - 550 vol.2
    Cited by:  Papers (1)
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  • Color image enhancement using local density function estimators

    Publication Year: 1997, Page(s):551 - 554 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    In this work two combinations of potential and Euclidean-based functions that lead to edge enhancement of color images are proposed. Potential functions are calculated at each pixel's neighbourhood, embodying spatial information and are used as local density estimators for the image. Color similarity information is included in the Euclidean distances in the RGB color space. View full abstract»

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