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检索条件"主题词=Compression algorithms"

共 2076 条记录，以下是841-850 订阅

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A new data compression algorithm for power quality online monitoring

A new data compression algorithm for power quality online mo...

引用

International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Dahai Zhang Yanqiu Bi Jianguo Zhao Department of Electrical Engineering Shandong University China

ISBN: (纸本)9781424449347

The increasing application of power quality data acquisition devices produces large amount of data that should be compressed. The paper investigates the characteristics of power quality data and delta modulation technique, and it proposes a lossless power data compression algorithm based on high-order delta modulation. The compression algorithm carries on multiple differential operations on power quality data, so it could reduce the magnitude of data and requires fewer bits for coding. The proposed algorithm has high compression ratio and little computation requirements. Furthermore, it is suitable for dealing with the power quality data measured at high sampling frequency, and it can work well with traditional compression methods such as Huffman coding. Simulations for several kinds of power quality data confirm its effectiveness and advantages over traditional Huffman coding method.

关键词： Data compression Power quality Monitoring Delta modulation Huffman coding Data acquisition compression algorithms Power measurement Frequency measurement Sampling methods

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Design and Realization of Data compression in Real-Time Database

Design and Realization of Data Compression in Real-Time Data...

引用

International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Chenggang Zhen Baoqiang Ren Key Laboratory of Condition Monitoring and Control of Power Plant Equipment Ministry of Education North China Electric Power University Baoding China College of Computer Science and Technology North China Electric Power University Baoding China

The structure of data compression in the real-time database has been introduced according to the historical data characteristic, the advantages and disadvantages of data compression algorithm in this paper. A new data compression algorithm based on universal LZ78 and LZW compression algorithm is proposed, the design and implementation of different types of data compression algorithm are presented, and the performance of the compression module has been tested.

关键词： Data compression Databases Real time systems Algorithm design and analysis compression algorithms Indexes Space technology Condition monitoring Buffer storage Laboratories

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Optimizing LZW Text compression Algorithm via Multithreading Programming

Optimizing LZW Text Compression Algorithm via Multithreading...

引用

IEEE Malaysia International Conference on Communications

作者： Ling Sun Tan Sei Ping Lau Chong Eng Tan Faculty of Computer Science and Information Technology University Malaysia Sarawak

ISBN: (纸本)9781424455317;9781424455324

Due to the emerging multimedia technology, multimedia files such as text, image, audio and video files are widely used. These multimedia files take hundreds time more space as compared to early day's media files. Thus, demand for efficient compression algorithm is in great needs. Currently, a lot of general purpose multi-core processor machines and systems are widely available. However, many compression algorithms have not been taking advantage of being optimized for these processors. This paper explores the multithreaded compression algorithm to take advantages offered by multi-core processor.

关键词： Text compression Parallel Multithreaded programming Text compression compression algorithms Parallel Lines Multi-core processors Videotapes Multithreading

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XML Schema Based compression Technology over XML Data Stream

XML Schema Based Compression Technology over XML Data Stream

引用

Web Information Systems and Applications Conference (WISA)

作者： Xiaolin Zhang Guofeng Zhai Rong Tian Information Engineering College Inner Mongolia University of Science and Technology Inner Mongolia Baotou China Teaching and Researching of Higher Education Beijing Command and Engineering College of Chemical Defense Beijing China

As XML has become the standard of data exchange and express of Internet and e-commerce, it is being more and more widely used, while XML is a kind of self-described language, with a large number of redundant structural information, so that is the hot study now on how to use XML data stream to be reasonable and efficient. The existing compression techniques of XML require two-pass scan on data, which is not suitable for the data stream. In this paper, a new compression technology method is proposed to compress and decompress XML data stream, which first get the structure data through analyzing and parsing the XML schema, then encode it with dynamic Huffman encoding, and finally complete the compression and decompression of XML data stream on real time. Experimental results show that this algorithm in the data compression ratio and time of compression is superior to the traditional algorithm.

关键词： XML Encoding Dictionaries Costs Data engineering Educational institutions Data compression Frequency compression algorithms Query processing

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Basis pursuit for ECG compression

Basis pursuit for ECG compression

引用

International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Monica Fira L. Goras Institute for Computer Science Iasi Romania Department of Electronics Telecommunications and Information Technology Gheorghe Asachi Technical University of Iasi Romania

This paper presents a discussion concerning ECG signals compression using the basis pursuit (BP) approach applied for several overcomplete wavelet dictionaries. The compression is based on an ldquooptimalrdquo superposition of dictionary elements, by minimizing the l 1 norm of the error. The best results have been obtained with the Coiflet 4 dictionary.

关键词： Electrocardiography Dictionaries Signal representations compression algorithms Heart Telemedicine Monitoring Surface waves Surface reconstruction Computer science

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Influence of hexadecimal character and decimal character for power waveform data compression

Influence of hexadecimal character and decimal character for...

引用

International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Dahai Zhang Yanqiu Bi Lin Jiang Jianguo Zhao Department of Electrical Engineering Shandong University China Department of Electrical Engineering and Electronics University of Liverpool UK

ISBN: (纸本)9781424449347

Data compression becomes an increasingly important problem in power quality online monitoring network due to the increasing quantity of sample data. Huffman code algorithm and Huffman code combined with wavelet transform are widely used in data compression. However, the compression ratio (CR) is not high enough because the characteristic of power quality data is not considered. Hence, efficient compression algorithm is required. In this paper, the characteristic of electrical power quality data is described. Through comparing the difference expression between the decimal code and the hexadecimal code, the paper discusses their influence on the compression ratio of power quality data. The algorithm with hexadecimal code expression is better than that with decimal one. Under the same condition the compression ratio using hexadecimal character compression is 3.8% higher than that using decimal character compression. The simulation analysis validates that the algorithm is efficient and feasible.

关键词： Data compression Power quality Signal processing algorithms compression algorithms Frequency Bismuth Wavelet packets Power system simulation Power system analysis computing Fourier transforms

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Study on ECG Data Lossless compression Algorithm Based on K-means Cluster

Study on ECG Data Lossless Compression Algorithm Based on K-...

引用

International Conference on Future Computer and Communication (FCC)

作者： Qunyi Zhou School of Information and Electronic Engineering Zhejiang University of Science and Technology Hangzhou China

It is very significant to telemedicine storage and transmission that compress large-scale dynamic electrocardiogram lossless. Considering temporal and spatial redundancies of electrocardiogram (ECG) data, an automatic lossless compression algorithm which is based on k-means cluster was proposed. Our algorithm was evaluated by MIT-BIH arrhythmia database, and evaluation result shows the proposed algorithm has better compression performance.

关键词： Electrocardiography compression algorithms Encoding Clustering algorithms Databases Shape Propagation losses Large-scale systems Data engineering Telemedicine

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An efficient lossless compression algorithm for Bayer pattern images

An efficient lossless compression algorithm for Bayer patter...

引用

International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Yuwei Xiao Peiyan Cheng School of Information Management Shanxi University of Finance and Economics Taiyuan China Experimental Teaching Center Shanxi University of Finance and Economics Taiyuan China

In this paper, we propose an effective sequential lossless compression scheme which performs sequentially pixel by pixel in raster-scan order. The proposed method has three major components: a causal interpolation module, a fixed predictor and context based adaptive arithmetic coder. The causal interpolation module estimates the values of past pixels in the context which are the same color as current predicted pixel. The predictor which is based on IF-THEN structure exploits structural redundancies between mosaic-like color components, and its residuals are well-modeled by a two-side geometry distribution centered at zero. An advantage of the proposed compression method is the clear separation between prediction and entropy coding of prediction errors. Finally, an effective and efficient arithmetic coder can be easily interfaced with our predictor. Experimental results show that our method outperforms all other evaluated schemes in all testing images in term of bit-rate while maintains modest complexity level.

关键词： compression algorithms Image coding Interpolation Arithmetic Performance loss Image converters Pixel Redundancy Wavelet packets Finance

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compression and stylometry for author identification

Compression and stylometry for author identification

引用

International Joint Conference on Neural Networks (IJCNN)

作者： D. Pavelec L. S. Oliveira E. Justino F. D. Nobre Neto L. V. Batista Pontifica Universidade Catolica do Parana Rua Imaculada Conceicao Curitiba Brazil Dpto de Informatica Universidade Federal da Paraiba Joao Pessoa Paraiba Brazil

In this paper we compare two different paradigms for author identification. The first one is based on compression algorithms where the entire process of defining and extracting features and training a classifier is avoided. The second paradigm, on the other hand, takes into account the classical pattern recognition framework, where linguistic features proposed by forensic experts are used to train a Support Vector Machine classifier. Comprehensive experiments performed on a database composed of 20 writers show that both strategies achieve similar performance but with an interesting degree of complementarity demonstrated through the confusion matrices. Advantages and drawback of both paradigms are also discussed.

关键词： Forensics compression algorithms Support vector machines Support vector machine classification Spatial databases Feature extraction Frequency Neural networks Pattern recognition Data mining

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Performance Analysis of Medical Image compression

Performance Analysis of Medical Image Compression

引用

International Conference on Signal Processing Systems, ICSPS

作者： K. Vidhya S. Shenbagadevi Electronics & Communication Engineering College of Engineering Anna University Chennai Tamil Nadu India

The paper deals with evaluation of medical images by objective quality measures. Two main approaches to assess image quality are objective testing and subjective testing. Objective measures correlate well with the perceived image quality for the proposed compression algorithm. This paper presents an effective algorithm to compress and to reconstruct DICOM (Digital Imaging and COmmunications in Medicine) images. DICOM is a standard for handling, storing, printing and transmitting information in medical imaging. These medical images are volumetric consisting of a series of sequences of slices through a given part of the body. DICOM series of images are decomposed using Cohen-Daubechies-Feauveau (CDF) biorthoganal wavelet. The wavelet coefficients are encoded using Set Partitioning In Hierarchical Trees (SPIHT). Consistent quality images are generated by this method at a lower bit rate compared to JPEG and Fractal compression algorithms. The image quality is evaluated by various objective quality measures.

关键词： Performance analysis Biomedical imaging Image coding Image quality DICOM Testing compression algorithms Image reconstruction Printing Wavelet coefficients

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