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检索条件"主题词=compression algorithms"

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AEP of output when rate is above capacity

AEP of output when rate is above capacity

引用

Canadian Workshop on Information Theory (CWIT)

作者： Xiugang Wu Liang-Liang Xie Department of Electrical and Computer Engineering University of Waterloo Canada

The output distribution, when rate is above capacity, is investigated. It is shown that there is an asymptotic equipartition property (AEP) of the typical output sequences, independently of the specific codebook used, as long as the codebook is typical according to the standard random codebook generation. This equipartition of the typical output sequences is caused by the mixup of input sequences when there are too many of them, namely, when the rate is above capacity. This discovery may shed some light on the optimal design of the compress-and-forward relay schemes.

关键词： Relays Decoding Code standards Channel coding Capacity planning Information theory compression algorithms Memoryless systems Random sequences

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Accelerating Multi-Patterns Matching on Compressed HTTP Traffic

Accelerating Multi-Patterns Matching on Compressed HTTP Traf...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： A. Bremler-Barr Y. Koral Computer Science Department Interdisciplinary Center Herzliya Israel

ISBN: (纸本)9781424435128

One of the fundamental technique which is used today by network security tools to detect malicious activities is 'signature based' detection. Today, the performance of the security tools is dominated by the speed of the string-matching algorithms that detect these signatures. Currently these security tools do not deal with compressed traffic, which becomes more and more common in HTTP. HTTP protocol uses the GZIP compression, which first requires some kind of decompression phase before performing the multi-patterns matching task. Thus, there is a high performance penalty in pattern matching on compressed data. In this paper we present a novel algorithm, Aho-Corasick-based algorithm for compressed HTTP (ACCH) that takes advantage of information gathered by the decompression phase in order to accelerate the commonly used Aho-Corasick pattern matching algorithm. We show by analyzing real HTTP traffic and real WAF signatures patterns, that we can skip scanning up to 75% of the data. Surprisingly, we show that in some situations, it is faster to do pattern matching on the compressed data, with the penalty of decompression, than doing pattern matching on regular traffic. As far as we know we are the first paper, that analyzes the problem of 'on-the-fly' multi-patterns matching algorithms on compressed HTTP traffic and suggest a solution.

关键词： Acceleration Pattern matching Telecommunication traffic Intrusion detection Web server Computer science Data security Algorithm design and analysis Encoding compression algorithms

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The Application of LZSS in the RFID Tags

The Application of LZSS in the RFID Tags

引用

IEEE International Symposium on Computer Network and Multimedia Technology, CNMT

作者： Heng Li Fei Gao Yanming Xue Shuo Feng Inf. & Electron Coll. Beijing Inst. of Technol. Beijing China

Compared with some common text file compression algorithms in the factors of compress ratio, rate and data coherence, and research on the data type of the RFID tags, we can find LZSS is the appropriate compression algorithm used in the RFID tag's data storage. LZSS is a lossless compression algorithm, it has a high compress ratio and quick compress rate, so it can raise the performance of RFID system if used in the tag's data storage.

关键词： RFID tags Radiofrequency identification compression algorithms Data compression Electrons Educational institutions Appropriate technology Memory Costs ISO standards

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An automatic wavelet-based nonlinear image enhancement technique for aerial imagery

An automatic wavelet-based nonlinear image enhancement techn...

引用

International Conference on Recent Advances in Space Technologies (RAST)

作者： Numan Unaldi Samil Temel Vijayan K. Asari Zia-ur Rahman Turkish Air Force Academy Istanbul Turkey ECE Department Old Dominion University Norfolk VA USA

Recently we proposed a wavelet-based dynamic range compression algorithm to improve the visual quality of digital images captured in the high dynamic range scenes with non-uniform lighting conditions. The fast image enhancement algorithm which provides dynamic range compression preserving the local contrast and tonal rendition is a very good candidate in aerial imagery applications such as image interpretation for defense and security tasks. This algorithm can further be applied to video streaming for aviation safety. In this paper the latest version of the proposed algorithm which is able to enhance aerial images so that the enhanced images are better then direct human observation, is presented. The results obtained by applying the algorithm to numerous aerial images show strong robustness and high image quality.

关键词： Image enhancement Dynamic range compression algorithms Digital images Layout Heuristic algorithms Image coding Security Streaming media Safety

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A Reconfigurable Transmission Scheme for Lossy Image Transmission over Congested Wireless Sensor Networks

A Reconfigurable Transmission Scheme for Lossy Image Transmi...

引用

Congress on Image and Signal Processing, CISP

作者： George Nikolakopoulos Nikolaos Fanakis Electrical and Computer Engineering Department University of Patras Patras Greece Research and Development Department of ZENON S.A. Athens Greece

In this article it is presented a reconfigurable transmission scheme for the lossy image transmission over congested wireless sensor networks (WSNs). This transmission scheme is based on the quad-tree algorithm for compressing each frame before transmitting it over the network. The proposed architecture: a) performs buffered transmission of quad-tree decomposed packets of an image frame over the WSN, b) measures the time of arrival of all the transmitted data packets that belongs to a single frame, at the receiver side of the network, and correspondingly c) adapts the threshold level of the compression algorithm, at the transmitter side of the network, based on an ad-hoc tuning method. The aim of this reconfiguration scheme, through the tuning of the compression threshold, is to guarantee that the established link in the WSN will provide images independently of the congestion of the network while a trade off between the quality of the received images and the refresh rate. Experimental results are presented that prove the efficacy of the proposed scheme.

关键词： Propagation losses Image communication Wireless sensor networks Image coding Bandwidth Delay effects Transceivers Time measurement compression algorithms Transmitters

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Energy efficient sensor data logging with amnesic flash storage

Energy efficient sensor data logging with amnesic flash stor...

引用

International Symposium on Information Processing in Sensor Networks (IPSN)

作者： Suman Nath Microsoft Research Limited USA

We present FlashLogger, an energy-efficient sensor data logging system that uses lazy amnesic compression in a flash-efficient manner. FlashLogger incorporates a suite of compression algorithms suitable for progressively compressing time series scalar, audio, and image data. It uses a novel data structure for efficiently organizing and querying compressed data on flash memory. All our methods are designed for the limited memory and processing capabilities typical of low power sensor nodes, and are prototyped on Tmote Sky platform running TinyOS. Evaluation of FlashLogger with several real world data sets shows orders of magnitude energy savings for both logging data and retrieving data within a time range.

关键词： Energy efficiency Energy storage Image coding Sensor systems compression algorithms Data structures Organizing Flash memory Design methodology Prototypes

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Intra prediction method based on the linear relationship between the channels for YUV 4∶2∶0 intra coding

Intra prediction method based on the linear relationship bet...

引用

IEEE International Conference on Image Processing

作者： Sang Heon Lee Nam Ik Cho School of Electrical Engineering Seoul National University Seoul South Korea

In general, the transformation from RGB to YUV color space reduces the correlation between the channels. But some sources in the YUV space still have strong inter-channel correlation, which can be modeled as a linear function. Based on this linear model, we propose a new intra chrominance prediction method for color image compression in YUV 4:2:0 color space. A block of chrominance pixels to be encoded is predicted from the reconstructed luminance signal using the proposed prediction scheme and the residual is encoded based on the H.264/AVC. Also, an implicit prediction method that can obviate the transmission of side information is proposed. The experimental results show that there are about 0.35~1.0 dB gains for the luminance (Y) channel, and 0.5~3.0 dB gains for the chrominance (Cb or Cr) channels at the medium to high bit-rates. The proposed method also shows some gains at the low bit-rates.

关键词： Prediction methods Image coding Decorrelation Color Automatic voltage control Video compression Motion pictures compression algorithms Parameter estimation Predictive models

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Content-adaptive musical audio watermarking based on the music theory of chords

Content-adaptive musical audio watermarking based on the mus...

引用

IEEE International Workshop on Haptic, Audio and Visual Environments and Their Applications

作者： Arjun Yogeswaran Pierre Payeur Jiying Zhao School of Information Technology and Engineering University of Ottawa Ottawa ONT Canada

This paper proposes a novel content-adaptive music watermarking technique which uses the principles of music theory to enhance the capacity and robustness of watermark embedding. Using the musical concepts of key and chords, certain notes, which are musically coherent with the work, can be added or removed without impacting the listeners experience. The notes serve as the carrier of the watermarked bit. Since these notes are still within the human hearing range, with high enough strength, they will still remain intact after various audio compressions or distortions. The scheme does not require the original work to extract the watermark and serves as a framework to involve musical theory in optimizing watermark embedding algorithms.

关键词： Watermarking Robustness Humans Auditory system Time domain analysis Audio compression Data mining Frequency domain analysis compression algorithms Information technology

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An Algorithm of Model Simplification and Multi-resolution Compressed Storage Oriented Navigation

An Algorithm of Model Simplification and Multi-resolution Co...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Haiyan Wu College of Computer and Information Engineering Zhejiang Gongshang University Hangzhou China

ISBN: (纸本)9781424452125

Building models and model mesh simplification multiresolution storage mechanism is the key for three-dimensional navigation widely used. This paper proposed a mesh simplification and multiresolution storage compression algorithm based on the model of edge collapse operations. First of all, it used an artificial interact method to set the protected feature points and grids and updated a series of partial model, and then simplified the three-dimensional model incremental and removal of unwanted vertex and grid, Finally entropy coding the storage part of the progressive to achieve a multi-resolution compressed storage.

关键词： Navigation Multiresolution analysis compression algorithms Protection Entropy coding Geographic Information Systems Equations Information technology Application software Educational institutions

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An approximate L0 norm minimization algorithm for compressed sensing

An approximate L0 norm minimization algorithm for compressed...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Mashud Hyder Kaushik Mahata School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia

lscr 0 Norm based signal recovery is attractive in compressed sensing as it can facilitate exact recovery of sparse signal with very high probability. Unfortunately, direct lscr 0 norm minimization problem is NP-hard. This paper describes an approximate lscr 0 norm algorithm for sparse representation which preserves most of the advantages of lscr 0 norm. The algorithm shows attractive convergence properties, and provides remarkable performance improvement in noisy environment compared to other popular algorithms. The sparse representation algorithm presented is capable of very fast signal recovery, thereby reducing retrieval latency when handling high dimensional signal.

关键词： Minimization methods Compressed sensing Working environment noise Convergence Computer science Australia Delay Sparse matrices compression algorithms Transform coding

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