检索结果-内蒙古大学图书馆

作者： Huang, Feng Shen, Xuban Zou, Xuecheng Chen, Chaoyang State Key Lab. Image Proc./I.C. Inst. Pattern Recognition/Artif. I. Huazhong Univ. of Sci./Technology Wuhan Hubei 430074 China Dept. of Electron. Sci./Technology Huazhong Univ. of Sci./Technology Wuhan Hubei 430074 China

This paper presents improvements in generation of wideband and high dynamic range analog signal for area-efficient MADBIST, especially for the on-chip testing of wireless communication IF digitizing sigma-delta modulator chip. Via increasing the order of the one-bit bandpass sigma-delta modulation algorithm up to 12 and using finite repetitious bitstream approximating scheme, it can achieve great improvements in signal bandwidth inst.ad of purity at the cost of very little hardware overhead. Another contribution in this work is to provide the theoretical analysis of the reconstructed signal degradation due to harmonic distortion and clock jitter. Such on-chip analog stimulus generation scheme is especially fit for IF digitizing bandpass sigma-delta modulator chip's production-time testing and in-the-field diagnostics. The technique can also be extended to mixed-signal communication SoC built-in-self-test. © 2002 Elsevier Science Ltd. All rights reserved.

关键词： Modulators

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New image correlation analysis based on fuzzy information gain

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Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University 2006年第3期40卷 466-470页

作者： Shen, Hong-Bin Yang, Jie Liu, Xiao-Jun Chen, Ning-Jiang Inst. of Image Processing and Pattern Recognition Shanghai Jiaotong Univ. Shanghai 200240 China Philips Research East Asia Shanghai 200070 China

Based on the statistic and the fuzzy uncertainty information in an image, a new fuzzy information gain method was proposed to measure the distinctness between the object image and the reference image, which provides a new criterion for image matching or retrieval. The experimental results demonstrate the effectiveness of the new method.

关键词： image processing

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Network-based VPN architecture using virtual routing

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Wuhan University Journal of Natural Sciences 2005年第1期10卷 161-164页

作者： Zhang, Bao-Liang Hu, Han-Ping Wu, Xiao-Gang Kong, Tao Lab. of Image Info. Wuhan 430074 China Inst. of Pattern Recognition Huazhong Univ. of Sci. and Technol. Wuhan 430074 China 709th Res. Inst. China Shipbuilding Eng. Society Wuhan 430074 China

A network-based Virtual Private Network (VPN) architecture by using fundamental routing mechanism is proposed. This network is a virtual overlay network based on the relay of IP-in-IP tunneling of virtual routing modules. The packet format employs the encapsulation of IPSec ESP (Encapsulating Security Payload), an impact path code and an extended OS (Differentiated Services) code to support multi-path routing and QoS. Comparing with other models of VPN, this network system can be deployed in the current network with little investment, and it is easy to implement. The simulation result shows its performance is better than the traditional VPN system of black box mode.

关键词： Network-based Proactive defense Virtual routing VPN

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Modified linear discriminant analysis and its application to face recognition

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Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University 2005年第4期39卷 527-530页

作者： Zhou, Da-Ke Yang, Xin Peng, Ning-Song Inst. of Image Processing and Pattern Recognition Shanghai Jiaotong Univ. Shanghai 200030 China Inst. of Electronic and Information Henan Univ. of Science and Technology Luoyang 471039 China

This paper presented an improved linear discriminant analysis (LDA) algorithm for face recognition, which can effectively deal with the two problems in traditional LDA-based approaches: (1) the small sample size problem, and (2) the Fisher criterion is nonoptimal with respect to classification rate. In particular, the proposed algorithm can also improve the classification rate of one or several appointed classes. The key to this method is to use the technique that it can reserves the significant discriminatory information for dimension reduction and meanwhile utilize a modified Fisher criterion. The comparative experiments on ORL face database verify the effectiveness of the proposed method.

关键词： Feature extraction

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Video-based tracking and quantified assessment of spontaneous limb movements in neonates

Video-based tracking and quantified assessment of spontaneou...

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International Conference on e-health Networking, Applications and Services (HealthCom)

作者： Long Xu Irene Yu-Hua Gu Anders Flisberg Magnus Thordstein Inst. of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai China Dept. of Signals and Systems Chalmers University of Technology Gotheburg Sweden Dept. of Pediatrics Sahlgrenska University Hospital Gothenburg Sweden Dept. of Clinical Neurophysiology Sahlgrenska University Hospital Gothenburg Sweden

ISBN: (纸本)9781467383264

Central nervous system dysfunction in infants may be manifested through inconsistent, rigid and abnormal limb movements. Detection and quantification of these movements in infants from videos are hence desirable for providing useful information to clinicians. This could lead to computer-aided diagnosis of dysfunctions where early treatment may improve infant development. In this paper, we propose a scheme for detecting and quantifying qualitative aspects of limb movement through multiple tracking and state space motion modeling on videos. The main novelties of the paper include: (a) An enhanced detection method for effectively detection small weak marker points from video; (b) Bayesian estimation and nearest neighbor searching for selecting new observation in individual tracker and for tracking marker trajectories on limbs; (c) A criterion for anomaly detection based on the frequency and duration of abrupt changes in limb movement, using window averaged prominent residual powers. The proposed method has been tested on videos of neonates, results show that the proposed method is promising for tracking and quantifying the movement of neonate limbs for helping medical diagnostics.

关键词： Pediatrics Videos Trajectory Tracking Estimation Feature extraction Clutter

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Bildverarbeitung für die Medizin 2018 1

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丛书名： Informatik aktuell

1000年

作者： Andreas Maier Thomas M. Deserno Heinz Handels Klaus Hermann Maier-Hein Christoph Palm Thomas Tolxdorff

ISBN: (数字)9783662565377

ISBN: (纸本)9783662565360

In den letzten Jahren hat sich der Workshop "Bildverarbeitung für die Medizin" durch erfolgreiche Veranstaltungen etabliert. Ziel ist auch 2018 wieder die Darstellung aktueller Forschungsergebnisse und die Vertiefung der Gespräche zwischen Wissenschaftlern, Industrie und Anwendern. Die Beiträge dieses Bandes - einige davon in englischer Sprache - umfassen alle Bereiche der medizinischen Bildverarbeitung, insbesondere Bildgebung und -akquisition, Maschinelles Lernen, Bildsegmentierung und Bildanalyse, Visualisierung und Animation, Zeitreihenanalyse, Computerunterstützte Diagnose, Biomechanische Modellierung, Validierung und Qualitätssicherung, Bildverarbeitung in der Telemedizin u.v.m.

关键词： image processing and Computer Vision pattern recognition Health Informatics

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Entropy-based color image segmentation with alterable resolution

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Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University 2005年第12期39卷 1975-1978页

作者： Ling, Jian-Guo Liu, Xiao-Jun Xu, Xin-He Yang, Jie Inst. of Image Processing and Pattern Recognition Shanghai Jiaotong Univ. Shanghai 200030 China Inst. of Artificial Intelligence and Robotics Northeastern Univ. Shenyang 110004 China The Second Inst. of Academy China Aerospace Science and Industry Corporation Beijing 100854 China

Two treatments of color image segmentation with information entropy were introduced: (1) The layers of the image are analyzed with whole information entropy and the segmentation resolution can be self-adapted;(2) The image is segmented with patch information entropy by segmenting the image in patch. According to the segmentation results, it can be found that the image segmentation with alterable resolution is more similar to the processing character of human vision.

关键词： image segmentation

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Application of noise erosion operator to anisotropic diffusion

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Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) 2004年第11期32卷 48-50页

作者： Cai, Chao Zhou, Chengping Ding, Mingyue Zhang, Tianxu Lab. for Image Proc. Inst. for Pattern Recognition Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

This paper proposed a morphological erosion operator based on partial differential equation (PDE). Its excellent performances on gradient image, noise removal and edge preserving were demonstrated. Based on this operator, an evaluating scheme of diffusion coefficients was introduced: the noise and edge of gradient image was controlled and preserved directly by this morphological erosion operator rather than by pre-smoothing input image with Gaussian function or the conventional morphological operator. The new diffusion coefficient had robustness to noise and better localization of edges. Experiments demonstrated that this anisotropic diffusion scheme could efficiently reduce image noise and sharpen the object boundaries.

关键词： Interference suppression

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Regularized restoration algorithm of astronautical turbulence-degraded images using maximum-likelihood estimation

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Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves 2005年第2期24卷 130-134页

作者： Hong, Han-Yu Zhang, Tian-Xu Yu, Guo-Liang Lab. of Image Proc. Inst. for Pattern Recognition and AI Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

A regularized restoration algorithm based on maximum-likelihood estimation was presented for restoring object images from the noisy turbulence-degraded images. The logarithmic maximum-likelihood function for multi-frame image data based on the model of image random field was built, and some auxiliary terms to smooth noise while preserve the edges of images and the penalized item to avoid trivial solutions were added to the maximum-likelihood function. The iterative formulas of calculating the PSFs and object image were derived so that the PSFs and the object image could be estimated in the iterative manner. A parallel processing scheme for the algorithm is also proposed. The restoration experiments on the simulated turbulence-degraded images in the case of noise show that the proposed algorithm has high ability of noise-resisting and it has some practical applications.

关键词： image processing

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3D terrain matching algorithm based on iso-elevation-contour map and normalized wavelet description

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Yuhang Xuebao/Journal of Astronautics 2004年第3期25卷 262-268页

作者： Yu, Qiu-Ze Tian, Jin-Wen Liu, Jian Lab. of Image proc. and Intelligence Inst. for pattern recognition Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

A contour-based 3D terrain matching method is presented. In the method, Iso-Elevation Contour Map (IECM), a compact feature-based representation is proposed to represent the reference DEM and recovered DEM (REM) from real-time data to convert 3-D terrain matching to contour-based matching. In the contour-based matching, a normalized wavelet descriptor, which is invariant to 2-D rigid transformation and insensitive to noise, is employed to describe contours. A very fast contour-matching algorithm based on normalized wavelet descriptor is presented and the computation cost is analyzed. Control points based on matched contour pairs are located. 2-D rigid image transformation model and parameter estimation using the rule of least root mean square error (RMSE) are discussed. The proposed matching method is robust and computing efficiency is very high, and can obtain high location accuracy;all these are demonstrated by experimental results using real terrain data.

关键词： 3D terrain matching DEM IECM Normalized contour distance Normalized wavelet descriptor REM

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