Lattice vector quantization applied on wavelet coefficients has been recently developed. In quantization applications, those lattices need to be truncated in order to limit the codebook size. In this paper, a quantiza...
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ISBN:
(纸本)0780309464
Lattice vector quantization applied on wavelet coefficients has been recently developed. In quantization applications, those lattices need to be truncated in order to limit the codebook size. In this paper, a quantization method with an elliptical truncation is presented. Conclusions are supported by a comparative study between spherical and elliptical codebooks. The elliptical scheme associated to an optimal orientation allows first to consider the neighbouring wavelet coefficients correlation, and then to credit the high ones representing edges. Those two points are partly responsible for the higher visual quality of the quantized image.
vision-based systems designed for industrial inspection must conform to requirements of cost, reliability, and totally unattended operation substantially different from those of related fields that use similar technol...
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ISBN:
(纸本)0780309464
vision-based systems designed for industrial inspection must conform to requirements of cost, reliability, and totally unattended operation substantially different from those of related fields that use similar technologies, such as military imageprocessing systems, video special effects systems, computers, and camcorders. But much of the high-speed image-processing hardware developed for these fields can also be applied to industrial inspection problems. This paper outlines the constraints imposed on typical industrial systems, and gives two extended examples to illustrate these ideas. Both examples make use of commercially-available pipelined imageprocessing hardware. The same hardware can also be used for many 1-D signalprocessingapplications, such a FIR and IIR filters, wavelet and Fourier transforms, correlation, etc.
Recent advances in mathematical theory related to the representation of signals and images by some limited-extent-wave functions have generated substantial interest in applications of waveforms that are localized in b...
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ISBN:
(纸本)0819413100
Recent advances in mathematical theory related to the representation of signals and images by some limited-extent-wave functions have generated substantial interest in applications of waveforms that are localized in both time (space) and frequency (spatial frequency) domains to signal and imageprocessing, pattern recognition, data compression, and neural networks. As a particularly useful model, the so-called wavelet transforms provide a variety of multiresolution signal (image) time-frequency or space-frequency decomposition tools. Digital parallel implementations of the wavelet transforms are computationally intensive both because of the nature of the coordinate dilation and erosion of these transforms and because of the large quantity of convolution/correlation operations accompanied. This paper is intended to outline some of the most useful properties of the wavelet transforms, their similarities, and differences to other known joint representations. The links between the wavelet transforms and optics also are discussed.
Picture archiving and communication systems (PACS) have to handle a lot of moving or still images services with different resolution levels (HDTV-like, TV-like and lower resolutions), quality requirements (from accept...
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ISBN:
(纸本)0819412236
Picture archiving and communication systems (PACS) have to handle a lot of moving or still images services with different resolution levels (HDTV-like, TV-like and lower resolutions), quality requirements (from acceptable visual quality to lossless) and different priorities. In this paper we present a new system for the integration of hierarchical images transmission in a broadband network based on the DQDB protocol (IEEE 802.6 standard). This system is based on the combination of two new tools. First we have designed a multiresolution/multiquality image coding scheme based on wavelet transforms. The main original feature of the algorithm is that it allows a multiresolution lossless access to images. A greater compression ration is possible at the price of graceful degradations. Secondly, we have implemented an improved priority mechanism in the DQDB protocol. The aim was that, in case of network overload, the emissions lose quality but are always maintained. A simulation of the implementation of such a system for the handling of the communications inside a hospital is also presented.
Dedicated VLSI implementation of DSP functions allows unequal wordlengths to be assigned to different intermediate variables in order to trade precision for area, power and speed. The authors present a method for dete...
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This paper presents a novel strategy for obtaining finite dimensional approximations of Riccati operators arising in game theoretic control problems on Hilbert spaces. While extensive progress has been made in the uti...
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This paper presents a novel strategy for obtaining finite dimensional approximations of Riccati operators arising in game theoretic control problems on Hilbert spaces. While extensive progress has been made in the utilization of the newly developed field of wavelet analysis in signal and imageprocessing, for less progress has been made in applications to computational mechanics. This fact is surprising considering the inherent multiresolution properties of wavelet analysis. This paper derives a wavelet Galerkin formulation of a specific class of computational control problems: zero sum dynamic games on Hilbert spaces. This work extends previous research in that not only are convergence, exponential stability and robust stability of soft constrained differential games on Hilbert spaces considered, but quantitative numerical conditioning results are also presented. In fact, a precise bound is given on the error induced by truncating wavelet quadratures used in the weak formulation of computational control problems. The theory presented is verified by modeling a robust control strategy for a beam subjected to piezoceramic actuation and structured uncertainty.
M-band generalizations of the FIR (finite impulse response) wavelets of I. Daubechies (1988) have been introduced. The authors present a set of explicit construction techniques for these M-band wavelet filters, and th...
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M-band generalizations of the FIR (finite impulse response) wavelets of I. Daubechies (1988) have been introduced. The authors present a set of explicit construction techniques for these M-band wavelet filters, and the results of their application to image compression. A characterization of several equivalent notions of Nth-order regularity for M-band perfect reconstruction filters is presented. This characterization is used to devise a closed-form expression for Nth-order regular wavelet lowpass filters. The construction of a full M-band filter bank given a lowpass filter and a rank M unitary matrix is completed. Several of these new wavelets are applied to image coding.< >
The regularity property was first introduced by wavelet theory for octave-band dyadic filter banks. In the present work, the authors provide a detailed theoretical analysis of the regularity property in the more flexi...
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The regularity property was first introduced by wavelet theory for octave-band dyadic filter banks. In the present work, the authors provide a detailed theoretical analysis of the regularity property in the more flexible case of filter banks with rational sampling changes. Such filter banks provide a finer analysis of fractions of an octave, and regularity is as important as in the dyadic case. Sharp regularity estimates for any filter bank are given. The major difficulty of the rational case, as compared with the dyadic case, is that one obtains wavelets that are not shifted versions of each other at a given scale. It is shown, however, that, under regularity conditions, shift invariance can almost be obtained. This is a desirable property for, e.g. coding applications and for efficient filter bank implementation of a continuous wavelet transform.< >
This paper presents a new idea about multiscale image segmentation. The method is based on wavelet theory and human vision model,and the exciting results of its applications to pneumoconiosis chest radiographs are shown.
This paper presents a new idea about multiscale image segmentation. The method is based on wavelet theory and human vision model,and the exciting results of its applications to pneumoconiosis chest radiographs are shown.
visual-based systems designed for industrial inspection must conform to requirements of cost, reliability, and totally unattended operation substantially different from those of related fields that use similar technol...
详细信息
visual-based systems designed for industrial inspection must conform to requirements of cost, reliability, and totally unattended operation substantially different from those of related fields that use similar technologies, such as military imageprocessing systems, video special effects systems, computers, and camcorders. But much of the high-speed image-processing hardware developed for these fields can also be applied to industrial inspection problems. The author outlines the constraints imposed on typical industrial systems and gives two extended examples to illustrate these ideas. Both examples make use of commercially available pipelined imageprocessing hardware. The same hardware can also be used for many 1-D signalprocessingapplications, such as finite impulse response (FIR) and infinite impulse response (IIR) filters, wavelet and Fourier transforms, correlation, etc.< >
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