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

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MAPPING RULES FOR MULTIPLE FAST SCAN PATTERNS MEMORY MODULES

MAPPING RULES FOR MULTIPLE FAST SCAN PATTERNS MEMORY MODULES

引用

4th conference in Optics (ROMOPTO 94)

作者： COLTUC, D BUZULOIU, V UNIV POLITEHN BUCURESTI BUCHURESTO 61ROMANIA

ISBN: (纸本)0819418137

Some signal processing applications require memory modules with very fast access along predefined scan patterns. If this requirement only holds for standard raster scan (image processing) the simple solution of reading in parallel a number of slower memory chips and using a fast parallel to serial converter is enough. This paper focuses on the problems which appear when more different fast scans patterns are required. In this case the mapping of the data in the memory chips is analyzed by using a combinatorial theory setting. We prove that a mapping which allows two different predefined scan patterns does always exist. For more than two different predefined scans our formalism allows one to construct a mapping, if it does exist. The paper presents several examples with 2 and 4 scan patterns.

关键词： SCAN PATTERN image processing MEMORY ARCHITECTURE FAST MEMORY ACCESS SYSTEM OF DISTINCT REPRESENTATIVES

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An M-band, 2-dimensional translation-invariant wavelet transform and applications

An M-band, 2-dimensional translation-invariant wavelet trans...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： S. Del Marco P. Heller J. Weiss Aware Inc. Cambridge MA USA

This paper develops a two-dimensional M-band translation-invariant wavelet transform (2-D MTI). Use of the MTI overcomes the shift-variance of the wavelet transform by applying a cost function over M shifts of the input signal. The new transform is proven to be translation-invariant. Use of M-band wavelets enables a finer frequency partitioning and greater energy compaction in the transform representation. Examples are presented which show that the translation-invariant transforms provide superior energy concentration compared to the corresponding nominal wavelet transforms. Examples are also presented comparing the energy concentration capability of M-band wavelets and the modulated lapped transform (MLT). We explored the MTI as a tool for image processing by using it to represent several different images.

关键词： Wavelet transforms Discrete wavelet transforms Filtering Two dimensional displays Frequency Filter bank Costs Artificial intelligence image processing Wavelet analysis

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DSP acceleration using cache logic FPGAs

DSP acceleration using cache logic FPGAs

引用

conference on Field Programmable Gate Arrays (FPGAs) for Fast Board Development and Reconfigurable Computing

作者： Rosenberg, J ATMEL CORP PROGRAMMABLE LOG MKT & APPLICATSAN JOSECA 95135

ISBN: (纸本)0819419710

Stand-alone digital signal processors (DSPs) support many on-chip functions and are highly optimized for the demands of high-speed computing. The problem associated with this functional optimization is that the increase in performance comes at the expense of flexibility. To make the DSP general purpose enough for a wide variety of applications, a custom ASIC must be used to achieve the desired performance. DSPs and ASICs are not able to easily adapt on-the-fly to different algorithms. Even DSPs that can do this don't match the high level of optimization provided by an ASIC. Recent developments in FPGA design tools enable system designers to develop in-system reconfigurable adaptive DSP hardware. Designed to exploit register rich, dynamically recongigurable field programmable gate arrays, high speed custom DSP functions can be created and implemented, resulting in significantly improved performance for compute-intensive applications, including graphics and image processing, telecommunications, networking and instrumentation.

关键词： acceleration adders boundary scan cache logic computing configuration DSP diagnostics digital signal processing FPGA macro generators multipliers reconfigurable hardware test

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Increased image resolution of aerial thermography based on signal processing: distortion correction in line scanners

Increased image resolution of aerial thermography based on s...

引用

Thermosense xVII: An International conference on Thermal Sensing and Imaging Diagnostic applications

作者： Jonsson, Ragnar H. Bjornsson, Sigfus Univ. of Iceland Reykjavik Icel

ISBN: (纸本)0819418269

Methods for correcting scanned remote sensing images for distortions due to undesirable aircraft motion are presented. The methods are intended for correcting distortions due to yaw and roll of the aircraft during image acquisition. The aircraft motion is estimated by analyzing the distortion of the scanned image. The correction of the distorted image is then based on the estimated motion. The correction is based only on the distorted image itself, and there is no need for any additional side information. This makes the methods presented well suited for correction of existing data, but the methods can also be used in real time correction during image acquisition. The effectiveness of the correction methods is demonstrated by examples using both real data, and synthetic data with known distortions.

关键词： Thermography (imaging)

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MPEG2 video and audio CODEC board set for a personal computer

MPEG2 video and audio CODEC board set for a personal compute...

引用

IEEE Global Telecommunications conference

作者： Tashiro, Y Izuoka, T Yanaka, K Ito, Y Ono, N Yashima, Y Yamauchi, H Kotera, H NIPPON TELEGRAPH & TEL PUBL CORP HUMAN INTERFACE LABS YOKOSUKA KANAGAWA JAPAN

ISBN: (纸本)0780325109

This paper describes MPEG2 video and audio coder and decoder boards and a set of dedicated codec chips which are the key components of these boards. MPEG2 is the international standard for moving picture coding algorithms and is expected to be applied to various fields because of its high image quality. The design policy has been decided based on intensive investigations of potential applications and popularity of video communication. From this view point, it is very efficient and important to implement an MPEG2 codec system on a personal computer (PC) platform. Since a short delay is particularly important for real-time applications such as teleconferencing, SP@ML has been adopted. In this case, the number of coding operations is reduced, but our simulation results show that the picture quality is almost the same as that of MP@ML. Non-real-time operation is also made possible so that application to interactive editing of video sequences can be achieved. Moreover, a considerable amount of processing is reduced by a hierarchical search algorithm. A nonlinear pre-filter is used to remove the noise included in the input video signal. Our prototype boards have been designed as PC/AT extension boards. The typical frame size is 720/spl times/480 pixels, and its rate is 30 frame per second. The maximum bit rate of the compressed data is 15 Mbit/sec.

关键词： image coding

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Evaluation and synthesis of wavelet image coders

Evaluation and synthesis of wavelet image coders

引用

IEEE International conference on image processing

作者： Jian Lu V.R. Algazi R.R. Estes Center for Image Processing andIntegrated Computing (CIPIC University of California Davis CA USA University of California Davis Davis CA US Center for Image Process. & Integrated Comput. California Univ. Davis CA USA

The design of a wavelet image coder can be divided into three parts: wavelet representation, quantization, and error-free encoding. We evaluate each of these parts individually and synthesize them into complete coders. The evaluation is in the rate-distortion sense; two image quality metrics are used: a perception-based, quantitative picture quality scale (PQS) and the conventional distortion measure, peak signal-to-noise ratio (PSNR). Two representative wavelets, three quantizers, three encoders, and some combinations of these parts are comparatively evaluated. Our results provide an insight into the design issues of optimizing wavelet coders, as well as a good reference for application developers to choose from an increasingly large family of wavelet coders for their applications.

关键词： Distortion measurement image coding PSNR Quantization Humans Wavelet packets image processing signal synthesis Rate-distortion image quality

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3D object recognition using coded light projection for robot assembly applications

3D object recognition using coded light projection for robot...

引用

Proceedings of the 1995 IEEE 21st International conference on Industrial Electronics, Control, and Instrumentation. Part 1 (of 2)

作者： Alshawish, Hadi M.Mahmud Allen, Charles R. The University Newcastle upon Tyne United Kingdom

This paper describes the algorithms needed to allow automatic recognition of components in three dimensions (3-D) using a novel active range sensor based on liquid crystal technology, which is programmed to project coded lighting sequences onto a pallet of workpieces within a flexible manufacturing cell. A range map with up to 1200 x 1200 range points is constructed using a sequence of binary image captures from a single robot head camera. Calibration of the vision sensor head is achieved using a grid of black squares on a white mat placed on the pallet prior to on-line operation and accuracy of 0.33% in height measurement are achieved over a working area of 100 x 100 cm. The range data is processed on a digital signal processing image analyser and construction solid geometry (CSG) surfaces are matched to the data sets to extract surface models of the components. The surface model is stored in an object database and used to recognise the position of workpieces in the robot coordinate frame.

关键词： Object recognition

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The wavelet transform of higher dimension and the Radon transform

The wavelet transform of higher dimension and the Radon tran...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Tai Chiu Hsung D.P.K. Lun Department of Electronic Engineering Hong Kong Polytechnic University Hung Hom China

Presents a fast algorithm for the computation of the wavelet transform in higher dimensional Euclidean space R/sup n/ with arbitrary shaped wavelets. The algorithm is a direct consequence of the convolution property of the Radon transform and shows significant improvement in speed. The authors also present a novel approach for the computation of the Daubechies type wavelet transform under the Radon transform domain where the n-dimensional multiresolution analysis (MRA) is reduced to one-dimensional MRA. They found applications of this approach on, for instance, multiresolution reconstruction of a tomographic image with the standard methods of denoising, where determination of wavelet coefficients is required under the Radon transform domain. Along with the possibility of reducing samples angularly with decreasing resolution, the efficiency can be further improved. Also, extra properties such as the "rotated" wavelet can be easily implemented with this algorithm.

关键词： Wavelet transforms Multiresolution analysis Convolution Wavelet analysis Wavelet domain image resolution image reconstruction Tomography Noise reduction Wavelet coefficients

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Motion-compensated adaptive wavelet filtering for image sequence processing

Motion-compensated adaptive wavelet filtering for image sequ...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J.-P. Leduc J.-M. Odobez C. Labit Campus de Beaulieu Centre INRIA de Rennes Rennes France

The paper presents new approaches in the field of motion-compensated spatio-temporal filters applied to digital image sequences. In time-varying imagery, the temporal correlation information of pixel intensities is folded by motions which may originate from both camera and object displacements. Motion-compensated filters are defined as temporal filters applied along assumed motion trajectories. As a matter of fact, the paper deals with three-dimensional spatio-temporal filters and aims at generalizing the motion-compensated temporal filtering process as the product of two distinct operators. The first operator depends only on the estimated motion parameters derived from both motion-based image segmentations and parametric affine modelings of regions in motion. The second operator analyzes only the correlations of image-by-image intensities measured along the assumed motion trajectories. Multiresolution filters or wavelets may be consequently applied along the motion trajectories to produce optimum and adaptive resulting procedures for purposes like spatio-temporal prediction, interpolation and smoothing. In the paper, applications are provided to cover the field of image sequence coding and interpolation.

关键词： Adaptive filters Filtering image sequences Interpolation Digital filters Digital images Pixel Cameras Motion estimation Parameter estimation

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Sharpening enhancement of digitized mammograms with complex symmetric Daubechies wavelets

Sharpening enhancement of digitized mammograms with complex ...

引用

Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： L. Gagnon J.M. Lina B. Goulard Phys. Dept University de Montréal Montreal QUE Canada

Some complex symmetric Daubechies wavelets provide a natural way to calculate zero-crossings because of a hidden "Laplacian operator" in the imaginary part of the scaling function. We propose a simple multiscale sharpening enhancement algorithm based on this property. The algorithm is tested on low-contrast digitized mammograms.

关键词： Testing image processing Attenuation Laplace equations signal resolution Frequency Wavelet coefficients Breast cancer Cancer detection x-ray imaging

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