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检索条件"主题词=entropy coding"

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Efficient alphabet partitioning algorithms for low-complexity entropy coding

Efficient alphabet partitioning algorithms for low-complexit...

引用

Data Compression Conference (DCC)

作者： A. Said Hewlett Packard Laboratories Palo Alto CA USA

We analyze the technique for reducing the complexity of entropy coding consisting of the a priori grouping of the source alphabet symbols, and in dividing the coding process in two stages: first coding the number of the symbol's group with a more complex method, followed by coding the symbol's rank inside its group using a less complex method, or simply using its binary representation. Because this method proved to be quite effective it is widely used in practice, and is an important part in standards like MPEG and JPEG. However, a theory to fully exploit its effectiveness had not been sufficiently developed. In this work, we study methods for optimizing the alphabet decomposition, and prove that a necessary optimality condition eliminates most of the possible solutions, and guarantees that dynamic programming solutions are optimal. In addition, we show that the data used for optimization have useful mathematical properties, which greatly reduce the complexity of finding optimal partitions. Finally, we extend the analysis, and propose efficient algorithms, for finding min-max optimal partitions for multiple data sources. Numerical results show the difference in redundancy for single and multiple sources.

关键词： Partitioning algorithms entropy coding Decoding Optimization methods Dynamic programming Algorithm design and analysis Computational complexity Facsimile MPEG standards Image coding

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FPGA Based Design of CAVLC and Exp-Golomb Coders for H.264/AVC Baseline entropy coding

FPGA Based Design of CAVLC and Exp-Golomb Coders for H.264/A...

引用

Southern Conference on Programmable Logic

作者： Thaisa Silva Joao Vortmann Luciano Agostini Sergio Bampi Altamiro Susin Group of Architectures and Integrated Circuits Federal University of Pelotas Pelotas Rio Grande do Sul Brazil Microelectronics Group Federal University of Rio Grande do Sul Porto Alegre Rio Grande do Sul Brazil

ISBN: (纸本)1424406064

This paper presents the design of a hardware architecture for the entropy coder of H.264/AVC video compression standard, considering the baseline profile. The baseline entropy coder is composed of two main blocks: Exp-Golomb coder and CAVLC coder. This paper presents the architectural design of these two blocks. These architectures were described in VHDL and synthesized to an Altera Stratix-II FPGA. From the synthesis results it was possible to verify that the Exp-Golomb and CAVLC coders reached a throughput of 15.9 million of samples per second for the Exp-Golomb coder and of 103.8 million of samples per second for CAVLC coder. The H.264/AVC baseline entropy coder is being designed through the integration of these two coders and preliminary results indicate that this solution will be able to process HDTV frames in real time.

关键词： Field programmable gate arrays Automatic voltage control entropy coding Code standards Video compression Codecs Hardware Microelectronics Throughput Computational complexity

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A Robust Ordering Scheme for entropy coding in Gray-Level Image

A Robust Ordering Scheme for Entropy Coding in Gray-Level Im...

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International Conference on Future Generation Communication and Networking Symposia, FGCNS

作者： Nam Yee Kim Kang Soo You Hoon Sung Kwak Department of Image Engineering. Chonbuk National University of Korea Jeonju Jeollabuk South Korea School of Liberal Arts Jeonju University Jeonju Jeollabuk South Korea

In this paper, we propose a robust ordering scheme for entropy coding in gray-level image. The issue is to reduce additional information needed when bitstream is transmitted. The proposed scheme uses the ordering method of co-occurrence count about gray-levels in neighboring pixels. That is, gray-levels are substituted by their ordering numbers without additional information. From the results of computer simulation, it is verified that the proposed scheme could be reduced the compression bit rate by up to 44.12%, 18.41% comparing to the entropy coding and conventional ordering scheme respectively. So our scheme can be successfully applied to the application areas that require of losslessness and data compaction.

关键词： Robustness entropy coding Image coding Application software Bit rate Digital images Military satellites Biomedical imaging Arithmetic Conferences

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Hardware implementation for entropy coding and byte stream packing engine in H.264/AVC

Hardware implementation for entropy coding and byte stream p...

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International Conference on Advanced Technologies for Communications, ATC

作者： Ngoc-Mai Nguyen Edith Beigne Suzanne Lesecq Pascal Vivet Duy-Hieu Bui Xuan-Tu Tran CEA LETI MINATEC Campus Grenoble France VNU University of Engineering and Technology Hanoi Vietnam

entropy coding and data packing are the major phases in video coding. The new video coding standard, H.264 Advanced Video coding (H.264/AVC), has adopted Exp-Golomb and Context-Adaptive coding methods to increase data compression ratio. In this paper, we propose hardware architecture of entropy encoding and byte stream data packing engines for the H.264/AVC. Our entropy coding engine, that contains Exp-Golomb and Context-Adaptive Variable Length coding (CAVLC), supports baseline and main profile of the standard. The proposed architecture is implemented using 180nm technology from AMS. The design consumes only 1.56mW at the operating frequency of 100MHz.

关键词： Syntactics Video coding Engines entropy coding Hardware Standards

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Predictive entropy coding of gain-shape VQ parameters

Predictive entropy coding of gain-shape VQ parameters

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

作者： F.M.O. Eryurtlu A.M. Kondoz B.G. Evans Centre for Satellite Engineering Research University of Surrey Guildford UK

This paper presents a novel video coding algorithm which exploits past frame statistics for entropy coding of the gain-shape VQ parameters. A subband transform has been used to decorrelate the motion compensation residual in order to overcome the block visibility problem. The vectors with samples from different subbands are quantised using a gain-shape VQ technique which allows effective bit rate control. When compared to the H.261 standard, the proposed algorithm has given higher PSNR values at lower bit rates.

关键词： entropy coding Bit rate Video coding Statistics Decorrelation Motion compensation PSNR

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The application for internal restructuring the data in the entropy coding process to enhance the information resource security

The application for internal restructuring the data in the e...

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East-West Design & Test Symposium (EWDTS)

作者： Vladimir Barannik Ivan Tupitsya Sergii Shulgin Sergii Sidchenko Volodymyr Larin Kharkiv National Air Force University Deputy chief of educational-training centre Kharkiv National Air Force University Cherkasy State Technological University

ISBN: (纸本)9781509006946

The possibility of using the internal restructuring message items according to the quantitative characteristic to improve the protection of information resources is viewed. Clustering elements in a variety of messages is under consideration. The advantages of internal restructuring the data in comparison with the methods for external restructuring are viewed.

关键词： entropy coding Information services Security Discrete cosine transforms Data processing Transform coding

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APCM performance improvement by means of entropy coding

APCM performance improvement by means of entropy coding

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IEEE International Symposium on Information Theory

作者： N.I. Pilipchouk G.R. Nadezhdina Mintz Radiotechnical Institute of Russian Academy of Sciences Moscow Russia

We have found the entropy of digital sources for the typical adaptive pulse code modulation systems and showed that entropy coding provides some gain in comparison with enumeration coding.

We have found the entropy of digital sources for the typical adaptive pulse code modulation systems and showed that entropy coding provides some gain in comparison with enumeration coding.< >

关键词： entropy coding Phase change materials Probability distribution Adaptive systems Control systems Delta modulation DH-HEMTs Integral equations Pulse modulation Modulation coding

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Joint image/video compression and encryption via high-order conditional entropy coding of wavelet coefficients

Joint image/video compression and encryption via high-order ...

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IEEE International Conference on Multimedia Computing and Systems (ICMCS)

作者： Xiaolin Wu P.W. Moo Department of Computer Science University of Western Ontario London ONT Canada

As the Internet and multimedia systems grow in size and popularity, compression and encryption of image and video data are becoming increasingly important. However, independent compression and encryption is too slow for many multimedia applications. This paper presents a new joint compression and encryption method for images and videos that uses high-order conditional entropy coding of wavelet coefficients to facilitate encryption. As a result, state-of-the-art compression and significantly enhanced security are achieved, with no extra computational complexity.

关键词： Video compression Cryptography entropy coding Image coding Streaming media Arithmetic Wavelet coefficients Data security Computer science Internet

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An optimal entropy coding scheme for efficient implementation of pulse shaping FIR filters in digital receivers

An optimal entropy coding scheme for efficient implementatio...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： A.P. Vinod A.B. Premkumar E.M.-K. Lai School of Computer Engineering Nanyang Technological University Singapore

The most computationally intensive part of wide-band receivers is the IF processing block. Digital filtering is the main task in IF processing. Infinite precision filters require complicated digital circuits due to coefficient multiplication. This paper presents an efficient method to implement pulse shaping filters for a dual-mode GSM/W-CDMA receiver. We use an arithmetic scheme, known as pseudo floating-point (PFP) representation to encode the filter coefficients. By employing a span reduction technique, we show that the filters can be coded using an optimal entropy scheme employing PFP which requires only considerably fewer bits than conventional 24-bit and 16-bit fixed-point filters. Simulation results show that the magnitude responses of the filters coded in PFP meet the attenuation requirements of GSM/W-CDMA specifications.

关键词： entropy coding Pulse shaping methods Finite impulse response filter Digital filters GSM Multiaccess communication Wideband Filtering Digital circuits Floating-point arithmetic

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Application of Genome Sequence Based on entropy coding

Application of Genome Sequence Based on Entropy Coding

引用

International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Hui Chen Dian Chi College of Yunnan University Kunming China

A novel genome sequence entropy coding algorithm based Context modeling is proposed. In this paper, the genome sequence data of bioinformatics features is sliced and reformed into 4 clusters according with biological meanings: the coding sequence cluster, the intron cluster, the RNA cluster and the residual cluster. According to the specific biological characteristics of the sequences in each set were pretreated respectively, then the sequences are compressed with entropy coding algorithm. The experiment shows that it is a good method to deal with the problem that than original DNA compression algorithms of the long DNA sequences, so it can make compression ratio and entropy coding efficient higher.

关键词： RNA Computational modeling DNA Genomics Clustering algorithms entropy coding Data models

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