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2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献

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Spatio-temporal post-filtering of 3-D coded video sequences 三维编码视频序列的时空后滤波
P. Skocir, B. Marusic, J. Tasic
Lossy video coding using wavelet transforms at low bit-rates results in coding artifacts mainly observed as ringing effects. The performance of a coding system can be additionally enhanced if a spatio-temporal post-processing algorithm is applied at the end of the coding chain. The description of an adaptive spatio-temporal algorithm is the objective of this paper. The algorithm takes into account the motion information to avoid temporal blurring of moving edges and spatial edge information to avoid spatial blurring while implementing temporal and spatial filtering in order to alleviate the presence of the artifacts. Motion information is used in order to tune the algorithm adaptively so that motion compensated temporal filtering is applied only in non-motion areas and motion areas with low prediction error. The proposed algorithm uses adaptive spatial filtering that is based on edge detection and ringing area estimation for pixel classification in edge and non-edge corrupted pixels. Spatial filtering leaves edges unaffected to preserve image details. Experimented results show significant increase in perceptual quality of wide sequences.
在低比特率下使用小波变换进行有损视频编码会产生编码伪影,主要表现为环形效应。如果在编码链的末端采用时空后处理算法,可以进一步提高编码系统的性能。本文的目标是描述一种自适应时空算法。该算法考虑运动信息以避免运动边缘的时间模糊和空间边缘信息以避免空间模糊,同时实现时空滤波以减轻伪影的存在。利用运动信息对算法进行自适应调整,使运动补偿时间滤波仅在非运动区域和预测误差较小的运动区域进行。该算法采用基于边缘检测和环形面积估计的自适应空间滤波对边缘和非边缘损坏像素进行分类。空间滤波使边缘不受影响,以保留图像细节。实验结果表明,宽序列的感知质量显著提高。
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引用次数: 0
Weighted least squares design of 2-D digital filters 二维数字滤波器的加权最小二乘设计
F.S. Al-Naimy, M. Nigam, A. Kasim
The design of finite impulse response (FIR) filters in one or two-dimensions can be performed with good computational efficiency using weighted least square (WLS) design. This paper presents an improved WLS technique for the design of 2-D FIR filters. We introduce an updating desired frequency response, which implicitly includes the weighting function such that the sum of weighted square errors to be minimized can be represented in a 2-D matrix form. This makes it possible to keep all filter parameters in their natural 2-D form, thereby reducing the computational complexity from O(N/sup 6/) to O(N/sup 3/). It is confirmed through design examples that our approach is computationally efficient and leads to nearly optimal approximations.
利用加权最小二乘(WLS)设计,可以在一维或二维空间中以较好的计算效率设计有限脉冲响应(FIR)滤波器。本文提出了一种用于二维FIR滤波器设计的改进WLS技术。我们引入了一个更新的期望频率响应,它隐含地包含了加权函数,使得要最小化的加权平方误差的和可以用二维矩阵形式表示。这使得将所有过滤器参数保持在其自然的二维形式成为可能,从而将计算复杂度从O(N/sup 6/)降低到O(N/sup 3/)。通过设计实例证实,我们的方法计算效率高,可以得到接近最优的近似。
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引用次数: 0
An architecture for miniaturised low power convolutional decoders 一种小型化低功耗卷积解码器架构
A. Demosthenous, J. Taylor
Convolutional decoders have long been important in applications where very noisy channels are encountered. The technique has become more significant with the advent of new application areas such as mobile radio systems of various types and digital magnetic recording systems. The most commonly employed decoding technique is the Viterbi algorithm (VA). This provides an optimum method for realising a convolutional decoder, but requires a large amount of digital memory, typically up to 50% of the total chip area. In this paper we describe an alternative method which we call the modified feedback decoding algorithm (MFDA). This requires no digital path memory and so can be realised entirely using analogue components. Although strictly sub-optimal, the loss of coding gain compared to the VA is only about 0.4 dB for a K=5 code.
卷积解码器在遇到噪声非常大的信道的应用中一直很重要。随着各种类型的移动无线电系统和数字磁记录系统等新应用领域的出现,该技术变得更加重要。最常用的解码技术是Viterbi算法(VA)。这为实现卷积解码器提供了一种最佳方法,但需要大量的数字存储器,通常高达芯片总面积的50%。本文提出了一种改进的反馈译码算法(MFDA)。这不需要数字路径存储器,因此可以完全使用模拟元件实现。虽然严格来说不是最优的,但对于K=5的编码,与VA相比,编码增益的损失仅为0.4 dB左右。
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引用次数: 2
Simulation approach for functional verification of an "ATM over ADSL" integrated circuit “ATM over ADSL”集成电路功能验证的仿真方法
E. Zervanos, V. Dimitropoulos, A. Manolitzas, G. Stassinopoulos
This paper concerns the design and development of an application specific integrated circuit, targeting advanced ATM over ADSL applications. The work focuses on the functional verification of this processor and presents the hardware and the basic software architecture of the entire integrated circuit.
本文针对先进的ATM over ADSL应用,设计和开发了一种专用集成电路。重点对该处理器进行了功能验证,并给出了整个集成电路的硬件结构和基本软件结构。
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引用次数: 4
Integrating Dempster-Shafer belief functions into a knowledge representation system based on Petri nets 将Dempster-Shafer信念函数集成到基于Petri网的知识表示系统中
A. Posavec
The expressive power and the epistemic adequacy of the Dempster-Shafer (DS) theory of evidence has often been acknowledged. DS theory of evidence is based on two components: a tool for representing belief for a statement, i.e. a pair of set functions (Bel, Pl) that quantify to what extent available evidence implies the statement and to what extent is available evidence consistent with the statement, respectively; and a tool for combining evidence. Thus DS theory deals with belief intervals rather than single numerical values of belief. There is an explicit differentiation between the notion of disbelief from that of lack of belief. However, as many other methodologies in the field of uncertain reasoning, DS theory addresses only the problem of representing the uncertainty of knowledge, without dealing with the problem of representing the knowledge itself. Saffiotti (1994) has proposed a framework for integrating the DS theory with a knowledge representation system. This approach introduces so-called belief bases, whose purpose is to allow embedding belief functions into a knowledge representation system which is better suited for representing the knowledge itself. Belief bases for a given knowledge representation system are built using three primitive operations, which utilize Dempster's combination rule. This paper describes an attempt at integrating appropriately modified belief bases into a knowledge representation system which utilizes Petri nets for representing knowledge.
邓普斯特-谢弗(DS)证据理论的表达能力和认知充分性经常得到承认。DS证据理论基于两个组成部分:一个表示陈述信念的工具,即一对集合函数(Bel, Pl),分别量化现有证据在多大程度上暗示了该陈述,以及现有证据在多大程度上与该陈述一致;也是一个整合证据的工具。因此,DS理论处理的是置信区间,而不是单个信念的数值。不相信的概念与缺乏信仰的概念之间有明显的区别。然而,正如不确定推理领域的许多其他方法一样,DS理论只解决表示知识的不确定性的问题,而没有处理表示知识本身的问题。Saffiotti(1994)提出了一个将DS理论与知识表示系统相结合的框架。这种方法引入了所谓的信念基础,其目的是允许将信念函数嵌入到更适合表示知识本身的知识表示系统中。对给定的知识表示系统,利用Dempster组合规则,采用三种基本操作构建信念基。本文描述了一种将适当修改的信念库集成到一个利用Petri网表示知识的知识表示系统中的尝试。
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引用次数: 0
Active filters for the improvement of electric power quality 有源滤波器用于改善电能质量
J. Shikoski, R. Achkoski, U. Rechkoska
In this paper the application of the active EMI filters in order to solve practical utility problems and to improve the electric power quality are presented. Electrical distribution system components are designed to operate at the standard 50 or 60 Hz frequency. However, many loads found in industrial and residential settings demand currents that have frequency components with multiples of the 60 Hz fundamental. The most common effect of harmonic load currents is heating. The increased temperature reduces rating of equipment and operating performance. In extreme cases failure of equipment may occur. The results demonstrate that although the larger components, differential-mode capacitors and common-mode inductors, may be needed for attenuation at the fundamental frequency, their effectiveness becomes very limited at higher frequencies due to parasitics.
本文介绍了有源电磁干扰滤波器在解决实际使用问题和改善电能质量方面的应用。配电系统组件设计为在标准50或60赫兹频率下运行。然而,在工业和住宅环境中发现的许多负载需要具有60 Hz基频数倍的频率分量的电流。谐波负载电流最常见的影响是加热。升高的温度降低了设备的额定值和运行性能。在极端情况下,可能会发生设备故障。结果表明,尽管在基频衰减时可能需要较大的元件,差模电容器和共模电感,但由于寄生,它们的有效性在较高频率时变得非常有限。
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引用次数: 1
Noise wave modeling of microwave transistors [MESFETs] 微波晶体管[mesfet]的噪声波建模
N. Males-Ilic, V. Markovic, O. Pronic
This paper presents a new procedure for noise modeling of microwave transistors based on the wave approach. The correlation matrix elements are calculated in terms of three equivalent noise temperatures. The strength of noise wave sources and correlation coefficient are shown graphically as a function of frequency and discussed. Also, the transistor noise parameters are determined from calculated noise wave sources by using microwave circuit simulator Libra.
本文提出了一种基于波法的微波晶体管噪声建模新方法。根据三个等效噪声温度计算相关矩阵元素。噪声波源的强度和相关系数以图形形式表示为频率的函数,并进行了讨论。利用微波电路模拟器Libra,从计算得到的噪声波源确定晶体管的噪声参数。
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引用次数: 0
Virtual worlds modeling for Web deployment 用于Web部署的虚拟世界建模
G. Moschovitis, K. Karpouzis, S. Kollias
We propose a design architecture for the graphics engine of a virtual reality system to be deployed over the Web. The graphics engine is decomposed into high and low level components. The high level component manages the hierarchical organization of the virtual objects, while the low level component acts as the interface to the graphics hardware and is mainly responsible for operations, such as vertex transforms and polygon rasterization. Several methods for geometry representation, compression and culling are compared and associated with different geometry types. The use of OpenGL as a general-purpose machine to implement mathematical operations is considered in the context of programmable shaders. Finally a prototype application for virtual worlds modeling is presented along with detailed discussion on technical and implementation issues.
提出了一种基于Web的虚拟现实系统图形引擎的设计体系结构。图形引擎被分解为高级和低级组件。高层组件管理虚拟对象的分层组织,而低层组件充当图形硬件的接口,主要负责顶点变换和多边形光栅化等操作。比较了几种几何表示、压缩和剔除方法,并将其与不同的几何类型相关联。在可编程着色器的背景下,考虑使用OpenGL作为通用机器来实现数学运算。最后给出了一个虚拟世界建模的原型应用程序,并详细讨论了技术和实现问题。
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引用次数: 0
Adaptive noise canceling and edge detection in images using PVM on a NOW 基于NOW的PVM图像自适应噪声消除和边缘检测
S. Mylonas, P. Trancoso, M. Trimikliniotis
A method for the processing of digital images using a two-dimensional LMS adaptive filter for noise reduction and subsequent edge detection is presented. This is implemented on a parallel virtual machine (PVM) consisting of inexpensive PCs (network of workstations, NOW). The experimental results for different image sizes and system configurations show close to linear speedup. Experiments to test dynamic load balancing are also performed.
提出了一种利用二维LMS自适应滤波器对数字图像进行降噪和边缘检测的方法。这是在由廉价pc(工作站网络,NOW)组成的并行虚拟机(PVM)上实现的。实验结果表明,在不同的图像尺寸和系统配置下,加速速度接近线性。并进行了动态负载均衡实验。
{"title":"Adaptive noise canceling and edge detection in images using PVM on a NOW","authors":"S. Mylonas, P. Trancoso, M. Trimikliniotis","doi":"10.1109/MELCON.2000.880025","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880025","url":null,"abstract":"A method for the processing of digital images using a two-dimensional LMS adaptive filter for noise reduction and subsequent edge detection is presented. This is implemented on a parallel virtual machine (PVM) consisting of inexpensive PCs (network of workstations, NOW). The experimental results for different image sizes and system configurations show close to linear speedup. Experiments to test dynamic load balancing are also performed.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132674019","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
The development of an ISO 9000 quality management system to meet the requirements of the European Foundation for Quality Management (EFQM) model-the Cyprus Telecommunications Authority's case 开发ISO 9000质量管理体系,以满足欧洲质量管理基金会(EFQM)模式的要求——塞浦路斯电信管理局的案例
M. Achilleos, G. Ioannou
The Cyprus Telecommunications Authority's (CYTA) modernisation programme focuses on the use of business process re-engineering tools in order to improve the organisation's customer focus and people focus orientation with parallel improvements in productivity, and the ability to develop and offer products and services with market improvements in operational flexibility. The Authority, in its search to find a modern management model able to support this modernisation programme and its path towards excellence, has opted for the European Foundation for Quality Management excellence model. In a parallel but not separated move, the Authority has decided to embark on the development and implementation of the ISO 9000 quality systems standard in its customer service operations. The first such system to be certified in June 1999, was the Authority's Limassol Customer Order Fulfillment Department and the second was the whole of the Customer Services in the area of Larnaca. The purpose of this paper is firstly to define how an ISO 9000 certified business unit can be measured against the requirements of the EFQM model and secondly outline a plan of action that could be used to guide this business unit towards the EFQM model of excellence.
塞浦路斯电信管理局(CYTA)的现代化计划侧重于使用业务流程重新设计工具,以提高组织以客户为中心和以人为中心的导向,同时提高生产力,以及开发和提供产品和服务的能力,同时提高市场运营灵活性。管理局在寻找一种现代管理模式,能够支持这一现代化计划,并朝着卓越的方向发展,因此选择了欧洲质量管理卓越基金会模式。与此同时,房委会亦决定在其客户服务工作中推行iso9000质量体系标准。第一个这样的系统于1999年6月获得认证,是管理局的利马索尔客户订单履行部,第二个是拉纳卡地区的整个客户服务部门。本文的目的首先是定义如何根据EFQM模型的要求来衡量ISO 9000认证的业务单位,其次概述了可用于指导该业务单位实现EFQM卓越模型的行动计划。
{"title":"The development of an ISO 9000 quality management system to meet the requirements of the European Foundation for Quality Management (EFQM) model-the Cyprus Telecommunications Authority's case","authors":"M. Achilleos, G. Ioannou","doi":"10.1109/MELCON.2000.880384","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880384","url":null,"abstract":"The Cyprus Telecommunications Authority's (CYTA) modernisation programme focuses on the use of business process re-engineering tools in order to improve the organisation's customer focus and people focus orientation with parallel improvements in productivity, and the ability to develop and offer products and services with market improvements in operational flexibility. The Authority, in its search to find a modern management model able to support this modernisation programme and its path towards excellence, has opted for the European Foundation for Quality Management excellence model. In a parallel but not separated move, the Authority has decided to embark on the development and implementation of the ISO 9000 quality systems standard in its customer service operations. The first such system to be certified in June 1999, was the Authority's Limassol Customer Order Fulfillment Department and the second was the whole of the Customer Services in the area of Larnaca. The purpose of this paper is firstly to define how an ISO 9000 certified business unit can be measured against the requirements of the EFQM model and secondly outline a plan of action that could be used to guide this business unit towards the EFQM model of excellence.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133927972","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
期刊
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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