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Robust estimation of camera motion in MPEG domain MPEG域摄像机运动的鲁棒估计
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414440
W. Gillespie, D. Nguyen
{"title":"Robust estimation of camera motion in MPEG domain","authors":"W. Gillespie, D. Nguyen","doi":"10.1109/TENCON.2004.1414440","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414440","url":null,"abstract":"In many applications requiring video processing for dynamic scene analysis such as object tracking in computer vision and motion-based automatic video indexing and retrieval, it is necessary to separate camera motion from object motions. This paper presents a robust least median-of-squares (LMedS) estimate of the camera motion using motion vector field of P-frames in an MPEG video sequence. A simplified 4-parameter affine flow model is used to describe the camera global motion and the model parameters are estimated using an LMedS approach to minimise the influence of the outliers (due to object motion and wrongly predicted block motion vectors) in the MPEG motion vector field. The 0.5 breakdown point of the LMedS technique is mostly avoided in this paper by prefiltering of the motion vector field to discard wrongly predicted motion vectors. The result produced by the proposed technique shows a significant improvement in the estimation of the camera motion model parameters compared to those produced by the M-estimator technique.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116109502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Channel reservation techniques under misbehaved users in high bit-rate wireless communication systems 高比特率无线通信系统中不良用户下的信道保留技术
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414695
C. Chanasong, A. Suriya, W. Srichavengsup, L. Wuttisittikulkij
{"title":"Channel reservation techniques under misbehaved users in high bit-rate wireless communication systems","authors":"C. Chanasong, A. Suriya, W. Srichavengsup, L. Wuttisittikulkij","doi":"10.1109/TENCON.2004.1414695","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414695","url":null,"abstract":"This paper presents a mathematical analysis of a channel reservation technique referred to as CFP for medium access control protocol in high bit-rate wireless communication systems with two groups of users, i.e. normal and misbehaved users. Two different misbehaving scenarios are investigated, namely cascade fixed prop + 2 group (CFP+2G) and cascade fixed prop + 2 group + multi-token (CFP+2G+MT). The objective is to evaluate the effect of some misbehaved users on the overall system performance. Numerical results show that the probability of success in reservation clearly degrades if some users do not follow the agreed rule.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122287468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Selective recovery in distributed systems 分布式系统中的选择性恢复
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414531
S. Neogy, A. Sinha, P. K. Das
{"title":"Selective recovery in distributed systems","authors":"S. Neogy, A. Sinha, P. K. Das","doi":"10.1109/TENCON.2004.1414531","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414531","url":null,"abstract":"Selective recovery of processes during rollback is a well known technique for avoiding unnecessary rollbacks of a large number of processes after a failure is detected in a distributed system. The technique that selects a minimum number of processes for recovery in the present work is simple and though the selection is on-line, it does not add any overhead. A process may however, be directly or even indirectly dependent on the faulty process and hence needs to recover. The initial tracking of dependence of a process on the faulty process is done by checking local variables. For maintaining consistency a process may have to rollback even if it is not directly dependent on the faulty process.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122534610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A practical RWA algorithm based on maximum EDPS and path conflict graph 基于最大EDPS和路径冲突图的实用RWA算法
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414716
Duk Hun Kim, M. Chung, Tae-Jin Lee, Hyunseung Choo
{"title":"A practical RWA algorithm based on maximum EDPS and path conflict graph","authors":"Duk Hun Kim, M. Chung, Tae-Jin Lee, Hyunseung Choo","doi":"10.1109/TENCON.2004.1414716","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414716","url":null,"abstract":"In optical transport networks based on wavelength division multiplexing (WDM) technique, one of the important issues is a routing and wavelength assignment (RWA) problem. The performance of optical networks may differ from RWA algorithms. In general, the more complex RWA algorithm is used, the more wavelength resource is saved. In this paper, we propose a novel approach using path conflict graph and an algorithm for finding edge disjoint paths (EDPs) as many as possible. And then we compare performance of the proposed algorithm with that of bounded greedy approach for EDP (BGA for EDP) algorithm.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122628158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the use of the transient information for gas identification using microelectronic gas sensor 微电子气体传感器利用瞬态信息进行气体识别
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414515
S. Brahim-Belhouari, A. Bermak, G. Wei, P. Chan
{"title":"On the use of the transient information for gas identification using microelectronic gas sensor","authors":"S. Brahim-Belhouari, A. Bermak, G. Wei, P. Chan","doi":"10.1109/TENCON.2004.1414515","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414515","url":null,"abstract":"Gas identification using microelectronic gas sensor represents a big challenge for pattern recognition systems due to a number of problems mainly related to non-selectivity and the drift. The use of preprocessing can often greatly improve the recognition performance. The aim of this paper is to evaluate the performance of different preprocessing techniques using transient information for gas identification from sensor array signals. We compare the classification accuracy of three feature extraction techniques based on steady state value, transient intergrals and dynamic slope. It was found that the transient information plays a critical role in improving the classification performance. In addition the proposed dynamic slope feature extraction technique is hardware friendly which makes the prospect of building a smart gas sensor very promising.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122977774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Tolerating multiple faults in WDM networks without wavelength conversion 在无波长转换的WDM网络中容忍多重故障
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414538
C. Sue, Jun-Ying Yeh, Yung-Chiao Chen, Chin-Yu Huang
{"title":"Tolerating multiple faults in WDM networks without wavelength conversion","authors":"C. Sue, Jun-Ying Yeh, Yung-Chiao Chen, Chin-Yu Huang","doi":"10.1109/TENCON.2004.1414538","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414538","url":null,"abstract":"This paper addresses the problem of tolerating as many faults as possible in wavelength division multiplexing (WDM) networks without the capability of wavelength conversion. The problem of finding the maximum number of faults that can be tolerated is modeled as a constrained ring cover set problem, which is a decomposition problem with exponential complexity. The face decomposition algorithm (FDA) that can tolerate one or more faults is proposed. From the results, we know that the maximum number of faults tolerated can be extended from one significantly under various network topologies.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"34 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114046475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A simulation based evaluation on the performance of integrated 3G wireless LAN network 基于仿真的3G无线局域网综合网络性能评估
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414656
K. Kazaura, L. Jun, M. Matsumoto
{"title":"A simulation based evaluation on the performance of integrated 3G wireless LAN network","authors":"K. Kazaura, L. Jun, M. Matsumoto","doi":"10.1109/TENCON.2004.1414656","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414656","url":null,"abstract":"New generation of mobile communication systems will focus on seamlessly integrating existing wireless technologies including 3G cellular systems, wireless LAN and Bluetooth to create a wide coverage, improved capacity and enhanced QoS heterogeneous wireless communication system. It is envisaged that the next generation of wireless communication systems will support comprehensive and personalized services, providing stable system performance and quality of service. In this paper we investigate and analyse the performance of a wireless communication system which consists of an integrated cellular communication system and a wireless LAN radio access networks inorder to determine an optimum combination of radio access technologies in a coverage area for efficient handling of mixed traffic requests from mobile users.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114460533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
An experimental study of ERBAC03 for access control administration ERBAC03用于访问控制管理的实验研究
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414530
B. Yenmunkong, C. Sathitwiriyawong
{"title":"An experimental study of ERBAC03 for access control administration","authors":"B. Yenmunkong, C. Sathitwiriyawong","doi":"10.1109/TENCON.2004.1414530","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414530","url":null,"abstract":"This paper proposes an extension of the conventional role-based access control (RBAC model) called enhanced role-based access control or ERBAC03 model. The model is developed for the role-based access control of information system resources in large organizations that have many branches. Each branch consists of many users with different roles. It is related to a specified static separation of duty constraint in order to prevent fraud of users. We analyze the result of RBAC and ERBAC03 models by a number of experiments based on users' locations. The result proves that the proposed ERBAC03 model eliminates the inaccuracy of access control administration that has incurred in the conventional RBAC model. Any conflicting role is not allowed to be added to the associated database tables.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121866172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single-phase converter with flying capacitor topology 带飞电容拓扑的单相变换器
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414871
B. Lin, Chun-Hao Huang
{"title":"Single-phase converter with flying capacitor topology","authors":"B. Lin, Chun-Hao Huang","doi":"10.1109/TENCON.2004.1414871","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414871","url":null,"abstract":"Novel single-phase AC/DC/AC converter with capacitor clamped topology is presented to achieve power factor correction in the AC/DC converter and to generate a sinusoidal voltage in the DC/AC inverter to the critical load. Three-leg configuration which has a common leg between the AC/DC and DC/AC converters is adopted to reduce the number of switching devices compared with the conventional three-level AC/DC/AC system. The AC/DC converter is operated to draw a sinusoidal line current with nearly unity power factor from the ac source and to keep the DC-link voltage constant. The DC/AC inverter is controlled to provide a stable sinusoidal voltage to the critical load. Three-level pulse-width modulated scheme is used to reduce the voltage harmonics in the input and output sides of the proposed system. The carrier-based control scheme in adopted in the system to track line current command and output voltage reference. The capacitor clamped topology is used in the adopted circuit to reduce the voltage stress of power devices. The system model and control algorithm are described and analyzed. Experimental results based on a laboratory prototype are provided to verify the effectiveness of the proposed control strategy.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122104660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
An efficient mobile Rayleigh fading channel simulator: a comparison with Clarke's model 一种高效的移动瑞利衰落信道模拟器:与Clarke模型的比较
2004 IEEE Region 10 Conference TENCON 2004. Pub Date : 2004-11-21 DOI: 10.1109/TENCON.2004.1414720
L. Shang, Z. M. Hussain, R.J. Harris
{"title":"An efficient mobile Rayleigh fading channel simulator: a comparison with Clarke's model","authors":"L. Shang, Z. M. Hussain, R.J. Harris","doi":"10.1109/TENCON.2004.1414720","DOIUrl":"https://doi.org/10.1109/TENCON.2004.1414720","url":null,"abstract":"This paper presents a computer model for Rayleigh fading channels. The simulated Rayleigh fading channel model is based on Smith's method and shows ease of implementation and greater mathematical tractability. We then investigate the level-crossing rate (LCR), the average duration of fades (ADF), the probability density function (PDF), the cumulative distribution function (CDF) and the autocorrelation functions (ACF) of this proposed model. The simulated results are verified against the analytical Clarke's channel model.","PeriodicalId":434986,"journal":{"name":"2004 IEEE Region 10 Conference TENCON 2004.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129531880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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