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检索条件"主题词=compression algorithms"

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Solving large scale problems using estimation distribution algorithm with arithmetic coding

Solving large scale problems using estimation distribution a...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Worasait Suwannik Prabhas Chongstitvatana Department of Computer Science Kasetsart University Bangkok Thailand Department of Computer Engineering Chulalongkom University Bangkok Thailand

This work proposes an algorithm which combines estimation distribution algorithm with a chromosome compression scheme to solve large scale problems. The search space reduction resulted from chromosome compression enables the proposed algorithm to solve one-million-bit problems and a one-billion-bit problem. Arithmetic coding represents a compressed binary string with two real numbers. Using this representation, a model of highly fit individuals can be constructed. This model can be used to evolve the solution in the manner of estimation distribution algorithm. The proposed algorithm is applied to large scale problems which are one-million-bit OneMax, royal road, trap functions. It is also applied to one-billion-bit OneMax problem. The experimental result shows that the proposed algorithm can solve million-bit OneMax problem in 4 seconds and billion-bit OneMax problem in 92 minutes using a normal PC-class computer.

关键词： Large-scale systems Biological cells Encoding Genetic algorithms Electronic design automation and methodology Digital arithmetic Computer science Distributed computing compression algorithms Genetic mutations

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Location Management in Wireless Fourth Generation Networks

Location Management in Wireless Fourth Generation Networks

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Faouzi Zarai Noureddine Boudriga Mohammad S. Obaidat CN&S Laboratory University of Carthage Tunisia Computer Science Department Monmouth University NJ USA

Satisfying quality of service (QoS) is one of the main goals of the wireless fourth generation (4G), which will integrate tightly a multitude of different heterogeneous networks including cellular networks (second generation, third generation, wireless local area networks, bluetooth, etc). In this paper, we develop an information-theoretic framework for optimal location updating and paging for wireless 4G network, which integrate tightly many different access networks. Then, we adopt the LZW compression algorithm as the basis of our location management schemes. Simulation results demonstrate that our proposed schemes decrease the signaling cost.

关键词： Paging strategies Electronic mail Quality of service Information theory Uncertainty Quality management Land mobile radio cellular systems Wireless LAN Bluetooth compression algorithms

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Design of Hybrid Vector Quantizer for the Gaussian Source

Design of Hybrid Vector Quantizer for the Gaussian Source

引用

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： Zoran H. Peric Velimir M. Ilic Jelena R. Nikolic Faculty of Electronic Engineering Nis Serbia

In this paper we propose new model of vector quantizers which combines two classical models of quantizers. Particularly, the proposed model, denoted as hybrid, combines the compandor model and the general Lloyd-Max's model of vector quantizers. The performance analizes of these models are caried out for the Gaussian input signals. It is demonstrated that for a fixed number of quantizaton cells vector quantizers designed according to the hybrid model provides quantizer's performance very close to the optimal that corresponds to the Lloyd-Max's quantizers.

关键词： Electronic mail Speech Video compression Computer applications compression algorithms Vector quantization Multidimensional systems Process design Design engineering Probability density function

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Content-Adaptive Wavelet-Based Scalable Video Coding

Content-Adaptive Wavelet-Based Scalable Video Coding

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Dionisis Athanasopoulos Thanos Stouraitis Electrical and Computer Engineering Department University of Patras Rio Greece

Motion-compensated temporal filtering (MCTF) is an essential ingredient of recently developed wavelet-based scalable video coding schemes. Lifting implementation of these decompositions represents a versatile tool for spatio-temporal optimizations and several improvements have already been proposed in this framework. Several coding parameters affect the performance of the scalable video coding scheme, such as the number of temporal levels and the interpolation filter used for sub-pixel accuracy. We show that the influence of these parameters depends on the video content. Thus, we present an adaptive way of choosing the value of these parameters, based on the video content. Experimental results show that the proposed method not only significantly improves the performance, but reduces the complexity of the coding procedure.

关键词： Video coding Finite impulse response filter Interpolation Filtering Discrete wavelet transforms Video sequences Motion compensation Adaptive filters Power engineering and energy compression algorithms

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Using H.264/AVC-Intra for Segmentation-Driven Compound Document Coding

Using H.264/AVC-Intra for Segmentation-Driven Compound Docum...

引用

IEEE International Conference on Image Processing

作者： Alexandre Zaghetto Ricardo L. de Queiroz Department of Electrical Engineering Universidade de Brasilia (UnB) Brazil

In this paper we explore H.264/AVC operating in intraframe mode to compress a mixed image, i.e. composed of text, graphics and pictures. Even though mixed contents (compound) documents usually require the use of multiple compressors, we apply a single compressor for both text and pictures. For that, distortion is taken into account differently between text and picture regions. Our approach is to use a segmentation-driven adaptation strategy to change the H.264/ AVC quantization parameter on a macroblock by macroblock basis, i.e. we deviate bits from pictorial regions to text in order to keep text edges sharp. We show results of a segmentation driven quantizer adaptation method applied to compress documents. Our reconstructed images have better text sharpness compared to straight unadapted coding, at negligible visual losses on pictorial regions. Our results also highlight the fact that H.264/AVC-INTRA outperforms coders such as JPEG-2000 as a single coder for compound images.

关键词： Image coding Automatic voltage control Image segmentation Compressors PSNR Video compression Testing compression algorithms Graphics Quantization

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Seekable Compressed Traces

Seekable Compressed Traces

引用

IEEE International Workshop/Symposium on Workload Characterization

作者： Tipp Moseley Dirk Grunwald Ramesh Peri Department of Computer Science University of Colorado Boulder CO USA Intel Corporation Hillsboro OR USA

Program traces are commonly used for purposes such as profiling, processor simulation, and program slicing. Uncompressed, these traces are often too large to exist on disk. Although existing trace compression algorithms achieve high compression rates, they sacrifice the accessibility of uncompressed traces; typical compressed traces must be traversed linearly to reach a desired position in the stream. This paper describes seekable compressed traces that allow arbitrary positioning in the compressed data stream. Furthermore, we enhance existing value prediction based techniques to achieve higher compression rates, particularly for difficult-to-compress traces. Our base algorithm achieves a harmonic mean compression rate for SPEC2000 memory address traces that is 3.47 times better than existing methods. We introduce the concept of seekpoints that enable fast seeking to positions evenly distributed throughout a compressed trace. Adding seekpoints enables rapid sampling and backwards traversal of compressed traces. At a granularity of every 10 M instructions, seekpoints only increase trace sizes by an average factor of 2.65.

关键词： compression algorithms Sampling methods Instruments Computer science Computational modeling Computer simulation Random access memory System testing Optimizing compilers Scheduling

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Bitstream Decompression for High Speed FPGA Configuration from Slow Memories

Bitstream Decompression for High Speed FPGA Configuration fr...

引用

IEEE International Conference on Field-Programmable Technology (FPT)

作者： Dirk Koch Christian Beckhoff Jurgen Teich Department of Computer Science 12 University of Erlangen Nuremberg Germany

In this paper, we present hardware decompression accelerators for bridging the gap between high speed FPGA configuration interfaces and slow configuration memories. We discuss different compression algorithms suitable for a decompression on FPGAs as well as on CPLDs with respect to the achievable compression ratio, throughput, and hardware overhead. This leads to various decompressor implementations with one capable to decompress at high data rates of up to 400 megabytes per second while only requiring slightly more than a hundred look-up tables. Furthermore, we present a sophisticated configuration bitstream benchmark.

关键词： Field programmable gate arrays Hardware Throughput compression algorithms Costs Video sharing Acceleration Algorithm design and analysis Computer science Silicon

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Security of Compressing Encrypted Sources

Security of Compressing Encrypted Sources

引用

Asilomar Conference on Signals, Systems & Computers

作者： G. Jakimoski K. P. Subbalakshmi Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA

When transmitting redundant data over an insecure channel, it is customary to first compress the data and then encrypt it. Johnson et al have investigated a cryptosystem where the order of these steps is reversed, and they have shown that this reversal is possible. We formally study the security of the encrypt-then-compress cryptosystems and show that the compression does not compromise the security of the system in both the information theoretic case (perfectly secure encryption) and the complexity theoretic case (computationally secure encryption).

关键词： Cryptography Data security Information security Protection Data privacy compression algorithms

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The impact of OBS burst aggregation on VBR performance

The impact of OBS burst aggregation on VBR performance

引用

IEEE International Conference on Telecommunications and Malaysia Communications (ICT-MICC)

作者： Mohamad Abdulatef Al-Shargabi Abdulwahab Abid Multimedia University Malaysia

Video and audio communications like video conference, news, and chat applications are candidates to be the greater portion of Internet traffic. Thus, using compressed video and audio traffic seems to be compulsory to reduce the costs of transmission and storage. Variable bit rate (VBR) compressed video and audio traffic have been receiving considerable attention due to their compression algorithms that transmit higher rate during high activity and low rate during less activity. This way of transmission creates a bursty traffic. Thus, transporting bursty traffic a crosses the network and needs a suitable environment to efficiently allocate network resources. Optical burst switching (OBS) is an optical environment that is suitable for bursty traffic. In this paper, we examine the conformity between OBS networks and VBR traffic by developing a simulation model to study the impact of OBS burst aggregation on VBR performance.

关键词： Telecommunication traffic Videoconference Video compression Traffic control Internet Costs Bit rate compression algorithms Resource management Optical burst switching

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Embedded ROI coding of mammograms via combined SPIHT and integer wavelet transforms

Embedded ROI coding of mammograms via combined SPIHT and int...

引用

IEEE International Conference on Electro-Information Technology

作者： Imad Zyout Ikhlas Abdel-Qader Hazem Al-Otum Department of Electrical and Computer Engineering Western Michigan University Kalamazoo MI USA Department of Electrical Engineering Jordan University of Science and Technology Irbid Jordan

In this paper, we investigate embedded region of interest (ROI) image coding of mammograms. This coding algorithm is based on combining set partitioning in hierarchical trees (SPIHT) scheme and reversible wavelet transform. We show that this combination produces both progressive and perfect reconstruction features. The benefit of such approach is that it offers the possibility of compressing ROI with high fidelity up to lossless and at early stages of the decoding process. This allows receiving ROI data with high fidelity at low bit rates while transmitting over PACS network. The results show that proper selection of reversible wavelet transforms is a significant element in ROI image coding. All mammograms are from MIAS database of which we included normal mammograms and abnormal ones with various types of abnormalities.

关键词： Wavelet transforms Image coding Image reconstruction Wavelet domain Breast cancer Tomography Partitioning algorithms Bit rate compression algorithms Costs

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