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检索条件"任意字段=Conference on Wavelets - Applications in Signal and Image Processing IX"

共 646 条记录，以下是71-80 订阅

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image and audio wavelet integration for home security video compression

Image and audio wavelet integration for home security video ...

引用

conference on Wavelet and Independent Component Analysis applications ix

作者： Cheng, YS Huang, GD Techsoft Technol Co Ltd Chungli Taoyuan Hsen Taiwan

ISBN: (纸本)081944488X

We present a novel wavelet compression algorithm for both audio and image with acceptable test by human perception. It is well known that Discrete Wavelet Transform (DWT) provides global multiple resolution decomposition that is the significant feature for the audio and image compressions. Experimental simulations show that the proposed audio and image model can satisfy the current industrial communication requirements in terms of the processing time and the compression fidelity. Development of wavelet-based compression algorithm considers the trade-off for hardware implementations. As a result, this high-performance video codec can develop compact, low power, high-speed, portable, cost-effective, and low-weight video compression for multimedia and home security applications.

关键词： Video compression image compression Quantization wavelets Video Discrete wavelet transforms Reconstruction algorithms Video processing image quality image processing

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FILTER BANKS AND wavelets IN signal-processing - A CRITICAL-REVIEW

FILTER BANKS AND WAVELETS IN SIGNAL-PROCESSING - A CRITICAL-...

引用

conference on Video Communications and PACS for Medical applications

作者： AKANSU, AN NEW JERSEY INST TECHNOL CTR COMMUN & SIGNAL PROC RESDEPT ELECT & COMP ENGNNEWARKNJ 07102

ISBN: (纸本)0819412236

This paper provides an overview of subband and wavelet theories. It emphasizes their strong relations. The practical merits of these decomposition techniques in signal processing are examined. The current status of this active research field is summarized and it concludes with the discussion of potential extensions for future study.

关键词： wavelets Transform theory signal processing Filtering (signal processing) Wavelet transforms Electronic filtering Fast wavelet transforms image compression Optical filters Optimal filtering

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Ultra-fast multiwavelet analysis using phase-encoded JTC

Ultra-fast multiwavelet analysis using phase-encoded JTC

引用

wavelets - applications in signal and image processing X conference

作者： Alsamman, A Univ New Orleans Dept Elect Engn New Orleans LA 70148 USA

ISBN: (纸本)0819450804

In this paper we present a technique for multiwavelet analysis using a phase-encoded optoelectronic joint transfer correlator (JTC). The optoelectronic joint transform correlator (JTC) is presented and analyzed as an effective optoelectronic correlator for ultra-fast wavelet analysis. By multiplexing reference wavelets in phase, mutiwavelet analysis is performed in a single correlation. The architecture of the proposed system and computer simulations are presented.

关键词： wavelets Optical correlators Ultrafast phenomena Optoelectronics Computing systems Multiplexing Computer simulations Wavelet transforms Computer architecture Joint transforms

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General stereo image matching using symmetric complex wavelets

General stereo image matching using symmetric complex wavele...

引用

4th conference on Wavelet applications in signal and image processing

作者： Pan, HP VISUAL PROC PROGRAM COOPERAT RES CTR SENSOR SIGNAL & INFORMAT PROCADELAIDESA 5095AUSTRALIA

ISBN: (纸本)0819422134

General stereo image matching provides an adequate but hard problem with sufficient complexity, with which the potential of wavelets may be exploited to a full extend. An ideal stereo image matching algorithm is supposed to be invariant to the scale, translation, rotation, and partial correspondence between two given stereo images. While the multi-resolution of wavelets is good at scale adaptivity, we also require the wavelet transform and pyramids to be translation- and rotation-invariant. This paper is intended to serve for three purposes: (1) To present the general problem of stereo image matching in a sufficient depth and extent, so that pure wavelet mathematicians could think on adequate and efficient solutions, (2) To present a complete algorithm for top-down image matching including surface reconstruction by using wavelet pyramids, (3) To search for a wavelet family optimal for image matching. It is expected that a family of adequately designed wavelets could provide a generic and robust solution to the stereo image matching problem, which could be an important breakthrough in computer vision, photogrammetry, and pattern recognition.

关键词： stereo image matching continuous wavelets and singularity-based matching symmetric complex wavelets top-down matching spiral and hierarchical parallax propagation surface reconstruction

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A new family of complex rotation-covariant multiresolution bases in 2D

A new family of complex rotation-covariant multiresolution b...

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wavelets - applications in signal and image processing X conference

作者： Forster, B Blu, T Unser, M Swiss Fed Inst Technol Biomed Imaging Grp EPFL Lib CH-1015 Lausanne Switzerland

ISBN: (纸本)0819450804

We present complex rotation-covariant multiresolution families aimed for image analysis. Since they are complex-valued functions, they provide the important phase information, which is missing in the discrete wavelet transform with real wavelets. Our basis elements have nice properties in Hilbert space such as smoothness of fractional order alpha is an element of R+. The corresponding filters allow a FFT-based implementation and thus provide a fast algorithm for the wavelet transform.

关键词： Complex wavelets Riesz basis two-scale relation multiresolution scaling functions

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Estimation risk of transformation-averaged estimators

Estimation risk of transformation-averaged estimators

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wavelets - applications in signal and image processing X conference

作者： Liu, J Moulin, P Palo Alto Res Ctr Palo Alto CA 94304 USA

ISBN: (纸本)0819450804

Wavelet image denoising practice has shown that the performance of simple estimators may be substantially improved by averaging these estimators over a collection of transformations such as translations or rotations. In this paper, we explain and quantify these empirical findings using estimation theory. We consider a general nonlinear observation model, analyze the estimation risk of transformation-averaged estimators, and derive an upper bound on the risk reduction due to transformation averaging. The bound is evaluated for several estimators, using different averaging strategies (including a randomized strategy) and different wavelet bases. The practical usefulness of the bound is established for standard image denoising examples.

关键词： wavelets estimation risk invariance transformation groups

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image denoising using orthonormal finite ridgelet transform

Image denoising using orthonormal finite ridgelet transform

引用

conference on Wavelet applications in signal and image processing VIII

作者： Do, MN Vetterli, M Ecole Polytech Fed Lausanne LCAV CH-1015 Lausanne Switzerland

ISBN: (纸本)0819437646

This paper addresses the image denoising problem using a newly proposed digital image transform: the finite ridgelet transform (FRIT). The transform is invertible, non-redundant and achieved via fast algorithms. Furthermore this transform can be designed to be orthonormal thus indicating its potential in many other image processing applications. We then propose various improvements on the initial design of the FRIT in order to make it to have better energy compaction and to reduce the border effect. Experimental results show that the new transform outperforms wavelets in denoising images with linear discontinuities.

关键词： wavelets Discrete wavelet transforms Denoising Radon transform image denoising Wavelet transforms Fourier transforms Radon Digital imaging image processing

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Non-linear shrinkage estimation with complex Daubechies wavelets

Non-linear shrinkage estimation with complex Daubechies wave...

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conference on Wavelet applications in signal and image processing V

作者： Lina, JM MacGibbon, B Univ. de Montreal and Atlantic Nuclear Services Ltd. (Canada) Univ. du Quebec a Montreal and Ecole des Hautes Etudes Commerciales (Canada)

ISBN: (纸本)0819425915

One of the main advantages of the discrete wavelet representation is the near-optimal estimation of signals corrupted with noise. After the seminal work of De Vore and Lucier (1992) and Donoho and Johnstone (1995), new techniques for choosing appropriate threshold and/or shrinkage functions have recently been explored by Bayesian and likelihood methods. This work is motivated by a Bayesian approach and is based on the complex representation of signals by the Symmetric Daubechies wavelets. applications for two dimensional signals are discussed.

关键词： wavelets Interference (communication)

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Reducing aliasing in wavelets based downsampling for improved resolution scalability

Reducing aliasing in wavelets based downsampling for improve...

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IEEE International conference on image processing (ICIP 2005)

作者： Abhayaratne, GCK Queen Mary Univ London Dept Elect Engn London E1 4NS England

ISBN: (纸本)0780391349

in wavelets based coding applications, resolution scalability is achieved by retaining the low pass signal subband corresponds to the required resolution and discarding other high pass wavelet subbands. Aliasing is a common problem present in such downsampling. In this paper a novel technique for improving the low pass filter for improved downsampling is presented. This method uses an extra update step followed by P+U lifting scheme. The preprocessing update step is chosen as the dual update step associated with the wavelet. The spatially adaptive low pass (SALP) filtering concept is used for the second update step, leading to an overall low pass filter whose size adapts to the underlying signal content. The filter choices for the second update step is recovered at the decoder without any bookkeeping. Results using the 2D 5/3 wavelet with the extra pre-processing update step show improvements over conventional wavelets.

关键词： Wavelet transforms

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Compactly supported wavelets and representations of the Cuntz relations, II

Compactly supported wavelets and representations of the Cunt...

引用

conference on Wavelet applications in signal and image processing VIII

作者： Jorgensen, PET Univ Iowa Dept Math Iowa City IA 52242 USA

ISBN: (纸本)0819437646

We show that compactly supported wavelets in L-2 (R) of scale N may be effectively parameterized with a finite set of spin vectors in C-N, and conversely that every set of spin vectors corresponds to a wavelet. The characterization is given in terms of irreducible representations of orthogonality relations defined from multiresolution wavelet filters.

关键词： wavelet Cuntz algebra representation orthogonal expansion quadrature mirror filter isometry in Hilbert space

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