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检索条件"主题词=Compression algorithms"

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On Improving the PPM Algorithm

On Improving the PPM Algorithm

引用

3rd International Symposium on Communications, Control, and Signal Processing (ISCCSP 2008), vol.3

作者： Gergely Korodi Ioan Tabus Department of Signal Processing Tampere University of Technology Tampere Finland

In this paper we analyze the Prediction by Partial Match algorithm as the aggregate of several functions operating on a context tree data structure. We describe some of the serious weaknesses of the original method, a... 详细信息

关键词： Signal processing algorithms Switches Counting circuits Context modeling Algorithm design and analysis Aggregates Tree data structures compression algorithms Predictive models Runtime

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Maximization of system lifetime in body sensor networks

Maximization of system lifetime in body sensor networks

引用

International Conference on Electrical and Computer Engineering (ICECE)

作者： Md. Nazrul Islam Mondal Kazi Mohiuddin Ahmed Department of Computer Science & Engineering Faculty of Electrical & Computer Engineering Rajshahi University of Engineering and Technology Bangladesh Department of Telecommunications School of Engineering & Technology Asian Institute of Technology Bangkok Thailand

In this paper, the target is to reduce the energy consumption in the body sensor network as well as maximize the system lifetime of sensor nodes when they will make communication among body sensors and personal communication unit. The best compression technique like LPC is selected for energy saving based on some calculations. Formulation of a linear programming problem where is to maximize the system lifetime which is equivalent to the time until the first node runs out of battery. Maximum system lifetimes are calculated by MATLAB optimization technique using and without using efficient compression algorithm like LPC in various environments. The results show that maximum system lifetimes calculated in different scenarios using efficient compression technique like LPC is better than without using compression technique.

关键词： Body sensor networks Linear predictive coding Power engineering and energy Linear programming Batteries Wireless sensor networks Computer networks Energy consumption Sensor systems compression algorithms

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Development of Telemedicine and Telecare over Wireless Sensor Network

Development of Telemedicine and Telecare over Wireless Senso...

引用

International Conference on Multimedia and Ubiquitous Engineering (MUE)

作者： Shuo-Jen Hsu Hsin-Hsien Wu Shih-Wei Chen Tsang-Chi Liu Wen-Tzeng Huang Yuan-Jen Chang Chin-Hsing Chen You-Yin Chen Department of Electrical and Control Engineering National Chiao Tung University Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Electrical Engineering National Taipei University of Technology Taiwan Department of Management Information Systems Central Taiwan University of Science and Technology Taiwan

ISBN: (纸本)9780769531342;0769531342

Telemedicine & Telecare aided by wireless sensor network (WSN) has recently become a health-caring trend in the future. However, the low data rate of WSN limited the acceptable quality of service. Researches [1-6] adopted ZigBee-based WSN to implement a platform and/or a telecare system. However, the capacity problem due to low data rate characteristic has not been addressed. Our research proposed an arrhythmia-aware telecare system and a new DSP-based WSN platform, enabling good digital signal processing performance in ZigBee-based WSN. Proved by simulations and several real tests, combination of the proposed platform and system can provide a more bandwidth-conserving and reliable telecare system, with lower wireless traffic jam and higher stability.

关键词： Telemedicine Wireless sensor networks Electrocardiography Discrete wavelet transforms Digital signal processing Monitoring compression algorithms System testing ZigBee Traffic control

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An embedded decryption/decompression engine using Handel-C

An embedded decryption/decompression engine using Handel-C

引用

International Symposium on Industrial Embedded Systems

作者： Farnaz Gharibian Kenneth B. Kent Reconfigurable Computing Laboratory Faculty of Computer Science University of New Brunswick Fredericton NB Canada

ISBN: (纸本)9781424419944;9781424419951

Speed and security of data streams are two key factors in different areas such as data communication and multimedia. compression algorithms are applied to data streams to increase their communication speed while encryption algorithms are used for assuring the security of the data transfer. AES and LZ77 are two well known algorithms for data encryption and compression respectively. In this paper we propose a model to implement both algorithms, decryption and decompression, in a field programmable gate array chip. Such a design must address the issues of optimal resource usage of the FPGA, and balance between the throughput of both algorithms. Handel-C is considered as the specification language for this design.

关键词： Engines Streaming media Data security Cryptography Field programmable gate arrays Data communication Multimedia communication compression algorithms Algorithm design and analysis Throughput

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GHIC: A GML Compressor with Holistic Isomorphic Characteristic

GHIC: A GML Compressor with Holistic Isomorphic Characterist...

引用

ETT and GRS International Education Technology and Training, and International Workshop on Geoscience and Remote Sensing

作者： Haitao Zhang Shuliang Zhang Guonian Lv Department of Communication & Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing Normal University Nanjing China

At present, GML data compression is a hotspot in the fields of geographic information sharing, interoperability. Based on the analysis of characteristics of traditional GML data compression methods, the paper proposed a GML compressor with holistic isomorphic characteristics, which achieves semantic isomorphic compression by constructing index encodings of feature elementspsila tags and achieves spatial data isomorphic compression by clustering GML spatial data, establishing local coordinate systems and converting GML spatial data into local coordinate systems. Experimental results show that the compressor is more effective than traditional compressors. The GML compressor proposed in this paper has a certain value for theoretical and technological researches of GML data storage, query and transmission.

关键词： XML Data compression Encoding compression algorithms Educational technology Geoscience and remote sensing Data engineering Memory Geographic Information Systems Object oriented modeling

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Adaptive total variation deringing method for image interpolation

Adaptive total variation deringing method for image interpol...

引用

IEEE International Conference on Image Processing

作者： Andrey Krylov Andrey Nasonov Faculty of Computational Mathematics and Cybernetics Moscow Lomonosov State University Moscow Russia

This paper presents a new adaptive post-processing algorithm for ringing artifact reduction after image interpolation (up sampling). The algorithm is based on the concept of total variation (TV) for ringing control. It uses known TV of the blocks of the low-resolution image. Conditional gradient, subgradient and projection subgradient methods for this algorithm are considered and analyzed. A test set of 181300 overlapping 11times11 blocks of real images was used for local algorithm optimization and analysis. Local conditional gradient method shows the best objective and subjective results.

关键词： Interpolation TV Algorithm design and analysis compression algorithms Transform coding Filtering algorithms Image edge detection Image processing Fractals Mathematics

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Performance improvements to NETCONF for airborne tactical networks

Performance improvements to NETCONF for airborne tactical ne...

引用

MILCOM, Military Communications Conference

作者： Giri Kuthethoor Prakash Sesha John Strohm Jia-ying Lu Chokchai Hansupichon Greg Hadynski David Climek John DelMedico Diane Kiwior Dan Dunbrack David Parker Lockheed Martin IS&GS Gaithersburg MD USA Air Force Research Laboratory Rome NY USA MITRE Bedford MA USA ESC Hanscom Air Force Base USA

Network configuration (NETCONF) is a widely used protocol to deploy configuration of network devices. NETCONF uses different transport layer protocols like secure shell (SSH), simple object access protocol (SOAP), or blocks extensible exchange protocol (BEEP) (IETF RFCs 4742 through 4744), and assumes availability of a high bandwidth network for successful configuration deployment. In a dynamic MANET tactical edge network consisting of fast-moving aircraft and terrain obscuration, conditions exist where traditional NETCONF may be less effective and eventually fails to provide guaranteed services to the war fighter. In this paper, we will look at the performance of NETCONF in a limited bandwidth constrained environment with periods of high packet loss. We will also consider the performance effect of using other compression algorithms and binary XML to reduce the amount of configuration data that is sent. Finally, we will study the usage of UDP-based NETCONF transport to improve the performance of NETCONF. By using UDP, data can be delivered more quickly than in a TCP-based transport. The performance analysis of such an airborne network as applied to different tactical scenarios with hundreds of assets will be accomplished through simulation.

关键词： Simple object access protocol Transport protocols Bandwidth Access protocols Availability Mobile ad hoc networks Military aircraft Performance loss compression algorithms XML

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Objective analysis of temporally varying audio quality metrics

Objective analysis of temporally varying audio quality metri...

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Asilomar Conference on Signals, Systems & Computers

作者： Joseph C. Hardin Charles D. Creusere Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces NM USA

Subjective audio quality is currently obtained using expensive and time consuming listening tests that provide limited information. In this paper we show the different behaviors of several objective metrics designed to match subjective results over different audio sequences for several audio distortions. In particular we extend these metrics to the case where distortions vary temporally and evaluate performance over two common time-varying distortions.

关键词： Testing Bandwidth Ear Performance analysis Signal to noise ratio Distortion Degradation Signal analysis Algorithm design and analysis compression algorithms

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Observations on Compressing Text Files of Varying Length

Observations on Compressing Text Files of Varying Length

引用

International Conference on Information Technology: New Generations (ITNG)

作者： Mohammad Hjouj Btoush Jawed Siddiqi Babak Akhgar Ziad Dawahdeh Sheffield Hallam University UK Mutah University Jordan

The paper compares different data compression algorithms of text files: LZW, Huffman, fixed-length code (FLC), and Huffman after using fixed-length code (HFLC). We compare these algorithms on different text files of different sizes in terms of compression scales of: size, ratio, time (speed), and entropy. Our evaluation reveals that initially for smaller size files the simplest algorithm namely LZW performs worst for first two scales than the more complex Huffman algorithm but as the size of the text increases interestingly the position is reversed. Moreover for the scales time and entropy LZW performs better than Huffmans but for larger files once again the position is reversed.

关键词： Data compression Probability Entropy compression algorithms Compressors Encoding Image storage Video compression Image coding Binary trees

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Lifting-Based Directionlet Transform for Image Coding

Lifting-Based Directionlet Transform for Image Coding

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9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP'08)

作者： Jing Bai Jiaji Wu Shan Lu Licheng Jiao Key laboratory of Intelligent Perception and Image Understanding of Ministry of Education of China Institute of Intelligent Information ProcessingXidian UniversityXi' an 710071P.R.China

In this paper,a new lifting scheme of directionlet transform(LDT) is presented,the corresponding multidirectional and anisotropic transform has latticebased separable filtering and subsampling along any two directions with rational *** design an adaptive compression algorithm based on LDT,using the quad-tree segmentation resulting optimized *** results show that our proposed compression algorithm for image coding outperforms the standard wavelet-based SPIHT and JPEG2000 both in terms of PSNR and visual quality,especially at the low-rate.

关键词： Image coding Wavelet transforms Anisotropic magnetoresistance compression algorithms Filtering Energy resolution Algorithm design and analysis Image segmentation Transform coding Quantization

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