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检索条件"主题词=compression algorithms"

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compression mechanism for multi-service switching networks with BPP traffic

Compression mechanism for multi-service switching networks w...

引用

International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Mariusz Głąbowski Maciej Sobieraj Communication and Computer Networks Poznan University of Technology Poznan Poland

The paper proposes a compression mechanism for multi-stage switching networks with multi-rate BPP (Binomial-Poisson-Pascal) traffic streams. The effectiveness of the proposed mechanism is compared to previously studied Call Admission Control (CAC) mechanisms for multi-rate switching networks, i.e. bandwidth reservation mechanism and threshold mechanism. The paper investigates by means of simulation method the influence of the CAC mechanisms on the key performance indicators of multi-service switching networks.

关键词： Optical switches Bandwidth compression algorithms Call admission control Broadband communication

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Using Normalized compression Distance for Classifying File Fragments

Using Normalized Compression Distance for Classifying File F...

引用

International Conference on Availability, Reliability and Security, ARES

作者： Stefan Axelsson Blekinge Institute of Technology Sweden

ISBN: (纸本)9781424458790

We have applied the generalized and universal distance measure NCD-Normalized compression Distance-to the problem of determining the types of file fragments via example. A corpus of files that can be redistributed to other researchers in the field was developed and the NCD algorithm using k-nearest-neighbor as a classification algorithm was applied to a random selection of file fragments. The experiment covered circa 2000 fragments from 17 different file types. While the overall accuracy of the n-valued classification only improved the prior probability of the class from approximately 6% to circa 50% overall, the classifier reached accuracies of 85%-100% for the most successful file types.

关键词： Classification algorithms Machine learning algorithms compression algorithms Shape measurement Concatenated codes Availability Security Machine learning Noise shaping Forensics

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An efficient 5/3-DWT based embedded compression algorithm for H.264 high definition decoder

An efficient 5/3-DWT based embedded compression algorithm fo...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Hongli Fei Huazhong Tsinghua University Beijing Beijing CN

To reduce the external memory cost, an efficient 5/3-DWT based embedded compression algorithm is proposed for H.264 decoder. Decoded frames are decomposed into 4×4 blocks which are then compressed into 32-bit or ... 详细信息

关键词： compression algorithms Decoding Fingerprint recognition Noise robustness Working environment noise Audio databases Frequency conversion Frequency domain analysis Acoustic noise Content based retrieval

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Test Patterns compression Technique Based on a Dedicated SAT-Based ATPG

Test Patterns Compression Technique Based on a Dedicated SAT...

引用

Euromicro Symposium on Digital System Design

作者： Jiří Balcárek Petr Fišer Jan Schmidt Faculty of Information Technology Czech Technical University in Prague Prague Prague Czech Republic

In this paper we propose a new method of test patterns compression based on a design of a dedicated SAT-based ATPG (Automatic Test Pattern Generator). This compression method is targeted to systems on chip (SoCs)provided with the P1500 test standard. The RESPIN architecture can be used for test patterns decompression. The main idea is based on finding the best overlap of test patterns during the test generation, unlike other methods, which are based on efficient overlapping of pre-generated test patterns. The proposed algorithm takes advantage of an implicit test representation as SAT problem instances. The results of test patterns compression obtained for standard ISCAS'85 and `89benchmark circuits are shown and compared with competitive test compression methods.

关键词： Circuit faults Benchmark testing Test pattern generators System-on-a-chip compression algorithms

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Neural Markovian Predictive compression: An Algorithm for Online Lossless Data compression

Neural Markovian Predictive Compression: An Algorithm for On...

引用

Data compression Conference (DCC)

作者： Erez Shermer Mireille Avigal Dana Shapira Department of Computer Science Open University of Israel Raanana Israel Department of Computer Science Ashkelon Academic College Ashkelon Israel

ISBN: (纸本)9781424464258;9780769539942

This work proposes a novel practical and general-purpose lossless compression algorithm named Neural Markovian Predictive compression (NMPC), based on a novel combination of Bayesian Neural Networks (BNNs) and Hidden Markov Models (HMM). The result is an interesting combination of properties: Linear processing time, constant memory storage performance and great adaptability to parallelism. Though not limited for such uses, when used for online compression (compressing streaming inputs without the latency of collecting blocks) it often produces superior results compared to other algorithms for this purpose. It is also a natural algorithm to be implemented on parallel platforms such as FPGA chips.

关键词： Prediction algorithms Data compression Neurons Neural networks Nerve fibers Hidden Markov models Bayesian methods Artificial neural networks Computer science compression algorithms

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An MCMC Approach to Lossy compression of Continuous Sources

An MCMC Approach to Lossy Compression of Continuous Sources

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Data compression Conference (DCC)

作者： Dror Baron Tsachy Weissman Electrical Engineering Department Technion-Israel Institute of Technology Haifa Israel Department of Electrical Engineering University of Stanford Stanford CA USA

ISBN: (纸本)9781424464258

Motivated by the Markov chain Monte Carlo (MCMC) relaxation method of Jalali and Weissman, we propose a lossy compression algorithm for continuous amplitude sources that relies on a finite reproduction alphabet that grows with the input length. Our algorithm asymptotically achieves the optimum rate distortion (RD) function universally for stationary ergodic continuous amplitude sources. However, the large alphabet slows down the convergence to the RD function, and is thus an impediment in practice. We thus propose an MCMC-based algorithm that uses a (smaller) adaptive reproduction alphabet. In addition to computational advantages, the reduced alphabet accelerates convergence to the RD function, and is thus more suitable in practice.

关键词： Image coding Convergence compression algorithms Statistical distributions Rate-distortion Impedance Acceleration Vector quantization Entropy coding Adaptive algorithm

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Packet compression for Time-Synchronized Wireless Networks

Packet Compression for Time-Synchronized Wireless Networks

引用

IEEE Communications Society Conference on Sensor and Ad Hoc Communications and Networks (SECON)

作者： Travis L. Massey Ankur Mehta Thomas Watteyne Kristofer S. J. Pister BSAC University of California Berkeley USA

Reducing the number of transmitted bytes in a wireless sensor network reduces the time the radio is on, resulting in a significant increase in battery lifetime. Toward this end we have developed a compression technique that is independent of the protocols used in the network, acts as a transparent layer, and consumes minimal computing resources. Patterns in recent packets are identified and replaced in the transmitted packet by bit flags. This algorithm was tested on packet traces collected from commercial wireless sensor networks for 40-80% compression, yielding comparable energy savings in a time-synchronized network.

关键词： Wireless networks Wireless sensor networks Dictionaries Batteries Media Access Protocol Pattern recognition compression algorithms Communications Society USA Councils Computer networks

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An x-Coordinate Point compression Method for Elliptic Curves over Fp

An x-Coordinate Point Compression Method for Elliptic Curves...

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International Symposium on Symbolic and Numeric algorithms for Scientific Computing (SYNASC)

作者： Alina Dudeanu George-Razvan Oancea Sorin Iftene Department of Computer Science Al.I.Cuza University Iasi Romania

In this paper we propose an x-coordinate point compression method for elliptic curves over F p , where p >; 3 is prime, as an alternative to the classical y-coordinate point compression method. A point P̃ = (x̃, y) will be compressed as P = (x, y) where x has only two bits and, thus, our method allows more compact representations when [log 2 x] >; [log 2 y]+1. Both our compression and decompression algorithms involve solving cubic equations or, in some cases, only computing cube roots modulo a prime, thus being of worst-case complexity O((log 2 p) 4 ). For some particular cases, our compression algorithm can be significantly improved, requiring only two multiplications (thus, being of worst-case complexity O((log 2 p) 2 )).

关键词： Elliptic curves Complexity theory Elliptic curve cryptography compression algorithms Polynomials

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Hardware implementation of a novel adaptive version of Deflate compression algorithm

Hardware implementation of a novel adaptive version of Defla...

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Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Tahghighi Mahsa Mousavi Pejman Khadivi ECE Department Isfahan University of Technology Isfahan Iran

ISBN: (纸本)9781424467600

In data compression or source coding algorithms, input sequences of symbols are converted to shorter sequences while the original information remains unchanged. One of the well-known data compression algorithms is Deflate which is designed based on the LZ method. Deflate method has three different modes where its second mode is applicable for real-time applications. In this mode, a certain static table of Huffman codes is employed during the coding procedure. In this paper, a new version of deflate algorithm is proposed and implemented in hardware. In the proposed method, a new basic coding table is employed. This table is modified adaptively based on the input sequence. Simulation results show that in this adaptive algorithm, the coding performance is improved. In the hardware implementation of the new method, through some parallelism concepts, we try to improve the hardware utilization and throughput.

关键词： Hardware compression algorithms Throughput Data compression Application software Algorithm design and analysis Dictionaries Source coding Adaptive algorithm Delay

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Robust Detection and Lossless compression of the Foreground in Magnetic Resonance Images

Robust Detection and Lossless Compression of the Foreground ...

引用

Data compression Conference (DCC)

作者： Andrés Corvetto Ana Ruedin Daniel Acevedo Departamento de Computación Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Argentina

ISBN: (纸本)9781424464258;9780769539942

Medical imaging is crucial for early detection and diagnosis of illnesses. The increasing amount of high resolution scans being done every day requires efficient compression algorithms. A magnetic resonance image (MRI) consists of a series of many cuts or slices. Viewed as a 3D image, it contains a 3D figure surrounded by background. This background is not clinically relevant.

关键词： Robustness Image coding Magnetic resonance Wavelet transforms Arithmetic Quantization Data compression Biomedical imaging compression algorithms Magnetic resonance imaging

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