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检索条件"任意字段=Conference on Visual Communications and Image Processing 2004"

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An Analog visual Feature Extraction Retina for Real-Time Stereo Vision

An Analog Visual Feature Extraction Retina for Real-Time Ste...

引用

European conference on Solid-State Circuits (ESSCIRC)

作者： Bogdan Arion Yang Ni Francis Devos Université Paris Sud Orsay France Institut National de Télécommunications Evry France

In this paper, we present an analog VLSI spatio-frequency analysis based visual feature extraction retina, dedicated to the real-time stereo vision. In this retina, local extreme points in the DoG filtered image are extracted as pertinent visual features. A 128-pixel line-based prototype chip is presented with experiment results. A processing speed of 100k lines/s has been obtained (exposition time excluded), it will be used in an integrated analog stereo vision system for real-time obstacle detection task.

关键词： Feature extraction Retina Stereo vision Band pass filters Switched capacitor networks MOS capacitors Very large scale integration Data mining Circuits Filtering theory

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VLSI implementation of discrete wavelet transform

VLSI implementation of discrete wavelet transform

引用

Annual IEEE International conference and Exhibit ASIC

作者： A. Grzeszczak T.H. Yeap S. Panchanathan Visual Computing and Communications Laboratory Department of Electrical Engineering University of Ottawa Ottawa ONT Canada

This paper presents a VLSI implementation of discrete wavelet transform (DWT). The architecture is systolic in nature and performs both high-pass and low-pass coefficient calculations with only one set of multipliers, in contrast to the approaches presented in the literature. The architecture is simple, modular, and cascadable, and has been implemented in VLSI. Experimental results show that real-time coefficient calculation on a 512/spl times/512 monochrome video input can be achieved with 1.2 /spl mu/m technology.

关键词： Discrete wavelet transforms Very large scale integration Discrete cosine transforms Wavelet transforms Computer architecture image coding Finite impulse response filter Video compression image reconstruction image processing

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ASSESSMENT OF image-CODING BY INFORMATION-THEORY 3

ASSESSMENT OF IMAGE-CODING BY INFORMATION-THEORY

引用

conference on visual Information processing III

作者： RAHMAN, ZU FALES, CL HUCK, FO SCI & TECHNOL CORP HAMPTONVA 23666

ISBN: (纸本)081941543X

The task of image coding is to improve the efficiency of visual communication channels. This entails minimizing the amount of data required to transmit the information about the radiance field. We assess this task in the context of visual communication channel design including image gathering, coding, and Wiener restoration which results in channel designs with significantly improved performance. Conventional assessments are limited to the digital transmission channel beginning at the output of the image-gathering device and ending at the input to the image-display device. Our end-to-end assessment, in addition, incorporates these two devices. This assessment combines Shannon's communication theory with Wiener's restoration filter and with the critical design factors of the image gathering and display devices. This provides the metrics needed to quantify and optimize the end-to-end performance of the visual communication channel. The results are described.

关键词： Quantization Signal to noise ratio image compression image restoration visual communications visualization image processing image quality visual information processing image transmission

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CONTOUR SIMPLIFICATION BY A NEW NONLINEAR FILTER FOR REGION-BASED CODING

CONTOUR SIMPLIFICATION BY A NEW NONLINEAR FILTER FOR REGION-...

引用

conference on visual communications and image processing 94

作者： GU, C KUNT, M SWISS FED INST TECHNOL SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)081941638X

The guiding principle of this study is to find an optimum way to simplify the contours produced by a second generation coding scheme based on morphological segmentation. For this purpose, evaluations of existing methods for contour simplification are carried out first. Based on the human visual phenomenon, a new nonlinear filter by means of majority operation is designed to simplify the contours in order to obtain an optimum compromise between the cost for contour coding and visual quality. Applications for region-based still image coding and video coding are demonstrated. Experimental results have shown an average of 20% reduction of bits for contour coding while keeping good visual quality.

关键词： image segmentation image compression Nonlinear filtering image filtering visualization image processing algorithms and systems Mathematical morphology Video coding 3D image processing image quality

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ELECTROOPTICAL DESIGN FOR EFFICIENT visual COMMUNICATION 3

ELECTROOPTICAL DESIGN FOR EFFICIENT VISUAL COMMUNICATION

引用

conference on visual Information processing III

作者： HUCK, FO FALES, CL JOBSON, DJ RAHMAN, ZU NASA LANGLEY RES CTRHAMPTONVA 23681

ISBN: (纸本)081941543X

visual communication can be regarded as efficient only if the amount of information that it conveys from the scene to the observer approaches the maximum possible and the associated cost approaches the minimum possible. To deal with this problem, Fales and Huck have integrated the critical limiting factors that constrain image gathering into classical concepts of communication theory. This paper uses this approach to assess the electro-optical design of the image gathering device. Design variables include the f-number and apodization of the objective lens, the aperture size and sampling geometry of the photodetection mechanism, and lateral inhibition and nonlinear radiance-to-signal conversion akin to the retinal processing in the human eye. It is an agreeable consequence of this approach that the image gathering device that is designed along the guidelines developed from communication theory behaves very much like the human eye. The performance approaches the maximum possible in terms of the information content of the acquired data, and thereby, the fidelity, sharpness and clarity with which fine detail can be restored, the efficiency with which the visual information can be transmitted in the form of decorrelated data, and the robustness of these two attributes to the temporal and spatial variations in scene illumination.

关键词： image processing Quantization visual communications Signal to noise ratio image restoration Electro optical design Eye Objectives visual information processing visualization

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LOW BIT-RATE FRACTAL image-CODING 3

LOW BIT-RATE FRACTAL IMAGE-CODING

引用

conference on visual Information processing III

作者： SLOAN, AD ITERATED SYST INC NORCROSSGA 30092

ISBN: (纸本)081941543X

This paper describes the methodology of fractal coding and some new fractal compression results for gray scale images. image compression is discussed from a systems point of view. Current measures of compression performance are not necessarily correlated with image system performance measures. For example, at a fixed `quality' level, bits/pixel type measures are correlated to transmission times for sending a single image under ideal conditions. However, such measures don't necessarily indicate interaction effects between image coding and systems issues such as communication channel errors and communication channel loading. It is proposed that a systems performance measure of image coding techniques be developed.

关键词： image compression Fractal analysis Telecommunications Digital imaging image resolution Computer programming Data communications Imaging systems image quality image processing

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WAVELET image MODELING AND ITS APPLICATION IN MODEL-BASED image-CODING

WAVELET IMAGE MODELING AND ITS APPLICATION IN MODEL-BASED IM...

引用

conference on visual communications and image processing 94

作者： GUAN, L UNIV SYDNEY DEPT ELECT ENGNSYDNEYNSW 2006AUSTRALIA

ISBN: (纸本)081941638X

This paper describes an image modeling scheme based on wavelet signal decomposition and statistical texture analysis, and its application in model-based image coding. In this approach, the image being considered is first decomposed into octal signal bands which contains different spectral components of the images. Based on the property of the signal decomposition statistical texture analysis techniques are hierarchically employed to separate the image into different categories with distinct modeling parameters. Coding is performed based on the texture image model.

关键词： image compression Wavelets Model-based design Discrete wavelet transforms Wavelet transforms Statistical modeling Motion models image analysis Statistical analysis image transmission

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BIORTHOGONAL WAVELETS FOR image COMPRESSION

BIORTHOGONAL WAVELETS FOR IMAGE COMPRESSION

引用

conference on visual communications and image processing 94

作者： MAJANI, E JET PROP LAB PASADENACA 91109

ISBN: (纸本)081941638X

Biorthogonal wavelets or filterbanks are shown to be superior in coding gain performance than orthogonal ones for logarithmic subband decompositions (limited to iterative decomposition of the downsampled output of the analysis low-pass filter). As a consequence, for logarithmic decompositions, the optimal filter is not an ideal filter. This is shown for maximally regular biorthogonal and orthogonal filters, as well as filters designed to optimize the subband coding grain.

关键词： DATA COMPRESSION CODING GAIN BIORTHOGONAL LINEAR PHASE OPTIMIZATION MAXIMALLY REGULAR

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MEDICAL image COMPRESSION USING B-SPLINES AND VECTOR QUANTIZATION

MEDICAL IMAGE COMPRESSION USING B-SPLINES AND VECTOR QUANTIZ...

引用

conference on visual communications and image processing 94

作者： ALIREZAIE, J ROBINSON, J UNIV WATERLOO DEPT SYST DESIGN ENGNWATERLOOON N2L 3G1CANADA

ISBN: (纸本)081941638X

A lossy image compression technique, incorporating least squares cubic spline pyramids, vector quantization, predictive coding and arithmetic coding was developed for the compression and reconstruction of Magnetic Resonance images. Typical results of 29.76 dB Peak Signal-to-Noise ratio (PSNR) for 0.45 bits per pixel (bpp) compression, and 27.91 dB PSNR for 0.33 bpp, compare very favorably with other, recently reported, medical image compression results. Furthermore, block artifacts are absent from the recovered pictures.

关键词： image COMPRESSION VECTOR QUANTIZATION CUBIC SPLINE PYRAMID LOSSLESS CODING

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FAST AUTOMATIC FACE FEATURE POINTS EXTRACTION FOR MODEL-BASED image-CODING

FAST AUTOMATIC FACE FEATURE POINTS EXTRACTION FOR MODEL-BASE...

引用

conference on visual communications and image processing 94

作者： WANG, XW CAI, DF CHINESE ACAD SCI INST ELECTRBEIJING 100080PEOPLES R CHINA

ISBN: (纸本)081941638X

A new scheme based on priori face knowledge and shift template method for fast face feature points extraction are presented in this paper. A fairly good accuracy and speed in detecting the feature points of eyebrows, eyes, nose and mouth have been achieved by a pair of complementary templates. It is shown by computer simulation that the scheme is very suitable for very low bit rate model-based image coding in real time applications.

关键词： MODEL-BASED image CODING PRIORI FACE KNOWLEDGE FEATURE POINTS EXTRACTION TEMPLATE MODEL

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