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检索条件"主题词=Compression Algorithms"

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Star-Derived Transforms in Lossless Text compression

Star-Derived Transforms in Lossless Text Compression

引用

International Symposium on Signals, Circuits and Systems

作者： Radescu, Radu Univ Politehn Bucuresti Appl Elect & Informat Eng Dept Bucharest Romania

ISBN: (纸本)9781424437849

This paper presents a study of transforms method used in lossless text compression in order to preprocess the text by exploiting the inner redundancy of the source file. The transform methods are derived from the Star (*) Transform. LIPT, ILPT, NIT, and LIT applied to text files emphasize their positive effects on a set of test files picked up from the classical corpora of both English and Romanian texts. Experimental results and comparisons with universal lossless compressors were performed, and set of interesting conclusions and recommendations are driven on their basis.

关键词： Sorting Encoding Arithmetic Testing Compressors compression algorithms Dictionaries Entropy Performance evaluation Adaptive algorithm

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Adapting Boyer-Moore-Like algorithms for Searching Huffman Encoded Texts

Adapting Boyer-Moore-Like Algorithms for Searching Huffman E...

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14th Prague Stringology Conference (PSC)

作者： Cantone, Domenico Faro, Simone Giaquinta, Emanuele Univ Catania Dipartimento Matemat & Informat I-95125 Catania Italy

ISBN: (纸本)9788001044032

In this paper we propose an efficient approach to the compressed string matching problem on Huffman encoded texts, based on the BOYER-MOORE strategy. Once a candidate valid shift has been located, a subsequent verification phase checks whether the shift is codeword aligned by taking advantage of the skeleton tree data structure. Our approach leads to algorithms with a suhlinear behavior on the average, as shown by extensive experimentation.

关键词： string matching compression algorithms Huffman codling Bayer-Moore algorithm text processing information retrieval

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A new no-reference assessment metric of blocking artifacts based on HVS masking effect

A new no-reference assessment metric of blocking artifacts b...

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2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Xu, Song Yingyun, Yang Information Engineering School Communication University of China Beijing China

ISBN: (纸本)9781424441310

In this article, a new algorithm-NABBHM based on HVS masking effect to assess blocking artifacts without reference is presented. We consider the brightness and complexity masking effect through defining two factors of masking to revise the original blocking artifacts value to make it more consistent with the human visual. Experiments show that NABBHM has strong feasibility and is highly fitting the subjective assessment value. ©2009 IEEE.

关键词： Brightness Humans Video compression Distortion measurement Image quality Image restoration compression algorithms Visual system Adaptation model Quality assessment

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Towards an efficient header compression scheme to improve VoIP over wireless mesh networks

Towards an efficient header compression scheme to improve Vo...

引用

IEEE Symposium on Computers and Communications (ISCC)

作者： Andrea Giordanna Nascimento Edjair Mota Saulo Queiroz Leandro Galvao Edson Nascimento Multimedia and Computer Network Research Group-GRCM Federal University of Amazonas Brazil

Header compression techniques can improve the speech quality of VoIP applications. However, its deployment over wireless mesh environments may not offer much improvement, since the wireless and multi-hop characteristics of such a network impose a high packet loss rate. In this work, we propose a new approach for header compression, using packet aggregation to cooperate with the header compression scheme. Simulation results show that the new cooperative approach can decrease significantly the packet loss, impacting positively on the speech quality.

关键词： Wireless mesh networks Speech Bandwidth Payloads Size control Spread spectrum communication compression algorithms Context Computer networks Application software

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An Efficient compression Algorithm (ECA) for Text Data

An Efficient Compression Algorithm (ECA) for Text Data

引用

International Conference on Signal Processing Systems, ICSPS

作者： Amit Jain Ravindra Patel Mandsaur Institute of Technology Mandsaur Madhya Pradesh India HOD (MCA) UIT RGTU Bhopal Madhya Pradesh India

Data compression algorithms are used to reduce the redundancy and storage requirement for data. Data compression is also an efficient approach to reduce communication costs by using available bandwidth effectively. Over the last decade we have seen an unprecedented explosion in the amount of digital data transmitted via the Internet in the form of text, images, video, sound, computer programs, etc. If this trend expected to continue, then it will be necessary to develop a compression algorithm that can most effectively use available network bandwidth by compressing the data at maximum level. Along with this it will also important to consider the security aspects of the compressed data transmitting over Internet, as most of the text data transmitted over the Internet is very much vulnerable to an attack. So, we are presenting an intelligent, reversible transformation technique that can be applied to source text that improve algorithm ability to compress and also offer a sufficient level of security to the transmitted data.

关键词： compression algorithms Internet Encoding Dictionaries Signal processing algorithms Data compression Arithmetic Bandwidth Explosions Data security

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A compression Algorithm for Multi-streams Based on GEP

A Compression Algorithm for Multi-streams Based on GEP

引用

International Conference on Genetic and Evolutionary Computing (WGEC)

作者： Chao Ding Chang-an Yuan Xiao Qin Yu-zhong Peng Computer and Information Engineering College Guangxi Teachers Education University Nanning China Key Laboratory of Scientific Computing & Intelligent Information processing University of Guangxi Nanning Guangxi China Computer and Information Engineering College University of Guangxi Nanning China

This paper applied the Methods which based on GEP in compress multi-streams. The contributions of this paper include: 1) giving an introduction to data function finding based on GEP(DFF-GEP), defining the main conception of Multi-Streams, and revealing the map relation in it; 2) putting forward the compression Algorithm for Multi-Streams according to map relation lied in data between data streams; and 3)providing an experience with the real data and find that (3.1) the compression ratio of the new methods is 120~150 times as the traditional wavelets method, and 35~70 times as the wavelets and coincidence method; (3.2) the relative error of the new method is about 3%, yet maximum relative error is 0.01 by using the traditional relative error standard, the precision is improved from 7% to 15% as compared with the traditional method.

关键词： compression algorithms Scientific computing Competitive intelligence Information processing Chaos Educational institutions Computer science education Monitoring Genetic engineering Gene expression

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Malware Detection via Classifying with compression

Malware Detection via Classifying with Compression

引用

International Conference on Information Science and Engineering (ICISE)

作者： Tao Gong Xiaobin Tan Ming Zhu Department of Automation University of Science and Technology Hefei Anhui China

ISBN: (纸本)9781424449095

The proliferation of malware has been causing great harm to computer and information systems. Traditional signature-based approaches fail to detect obfuscated malware and unknown malware. We present a preliminary study on classifying with compression of program instructions for malware detection. The code structure information was utilized to compress. The disassembled code is converted to its intermediate representation. We extract the opcode to form the stream for prediction by partial matching (PPM). The binaries are classified with this statistical compression algorithm. The preliminary experiment shows that our method can efficiently detect malware with high accuracy and low false positive rate.

关键词： Probability distribution Information systems Learning systems Information science Automation Data mining compression algorithms Data compression Internet Computer security

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Adaptive Linear Filtering compression on realtime sensor networks

Adaptive Linear Filtering Compression on realtime sensor net...

引用

IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Aaron B. Kiely Mingsen Xu Wen-Zhan Song Renjie Huang Behrooz Shirazi Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA Sensorweb Research Laboratory Washington State University Vancouver WA USA

We present a lightweight lossless compression algorithm for realtime sensor networks. Our proposed adaptive linear filtering compression (ALFC) algorithm performs predictive compression, using adaptive linear filtering to predict sample values followed by entropy coding of prediction residuals, encoding a variable number of samples into fixed-length packets. Adaptive prediction eliminates the need to determine prediction coefficients a priori and, more importantly, allows compression to dynamically adjust to a changing source. The algorithm requires only integer arithmetic operations and thus is compatible with sensor platforms that do not support floating-point operations. Significant robustness to packets losses is provided by including small but sufficient overhead data to allow samples in each packet to be independently decoded. Real-world evaluations on seismic data from a wireless sensor network testbed show that ALFC provides more effective compression and uses less resources than some other lossless compression approaches such as S-LZW. Experiments in a multi-hop sensor network also show that ALFC can significantly improve raw data throughput and energy efficiency.

关键词： Maximum likelihood detection compression algorithms Adaptive systems Prediction algorithms Filtering algorithms Entropy coding Encoding Floating-point arithmetic Robustness Decoding

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Distortions of synthesized views caused by compression of views and depth maps

Distortions of synthesized views caused by compression of vi...

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3DTV Conference

作者： Krzysztof Klimaszewski Krzysztof Wegner Marek Domanski Chair of Multimedia Telecommunications and Microelectronics Poznań University of Technology Poland

The paper deals with prospective 3D video transmission systems that would use compression of both multiview video and depth maps. The paper addresses the problem of quality of views synthesized from other views transmitted together with depth information. For the state-of-the-art depth map estimation and view synthesize techniques, the paper proves that AVC/SVC-based multiview video coding technique can be used for compression of both view pictures and depth maps. The paper reports extensive experiments where synthesized video quality has been estimated by use of both PSNR index and subjective assessment. Defined is the critical value of depth quantization parameter as a function of the reference view quantization parameter. For smaller depth map quantization parameters, depth map compression has negligible influence on fidelity of synthesized views.

关键词： Video compression Bit rate Quantization Automatic voltage control Video coding State estimation TV Transmitters compression algorithms Testing

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K-RLE: A New Data compression Algorithm for Wireless Sensor Network

K-RLE: A New Data Compression Algorithm for Wireless Sensor ...

引用

International Conference on Sensor Technologies and Applications, SensorComm

作者： Eugène Pamba Capo-Chichi Hervé Guyennet Jean-Michel Friedt Laboratory of Computer Science-LIFC University of Franche-Comté Besancon France FEMTO-ST/LPMO University of Franche-Comté Besancon France

In the context of the use of wireless sensor network technology for environmental monitoring, the two main elementary activities of wireless sensor network are data acquisition and transmission. However, transmitting/receiving data are power consuming task. In order to reduce transmission-associated power consumption, we explore data compression by processing information locally. In this article, we evaluate and compare compression algorithms on an ultra-low power microcontroller from Texas Instrument within the MSP430 series used for designing wireless sensor network. We propose and evaluate a new data compression algorithm inspired from run length encoding called K-RLE.

关键词： Data compression Wireless sensor networks Monitoring Data acquisition Energy consumption compression algorithms Microcontrollers Instruments Algorithm design and analysis Encoding

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