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检索条件"主题词=entropy coding"

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An Area Efficient Real-time CAVLC IP-Block towards the H.264/AVC Encoder

An Area Efficient Real-time CAVLC IP-Block towards the H.264...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Choudhury A. Rahman Wael Badawy Laboratoryfor Integrated Video Systems (LIVS) University of Calgary Calgary AB Canada

This paper presents a novel context-based adaptive variable length coding (CAVLC) architecture based on split and shared VLC look up table technique. The architecture is prototyped in Verilog HDL, simulated and synthesized for Xilinx Virtex II FPGA. The experimental result shows that the proposed architecture is capable of processing CIF frame sequences in real-time and is smaller than any of the real-time architectures proposed so far. The maximum speed of the core is around 60 MHz

关键词： Automatic voltage control Streaming media IEC standards ISO standards entropy coding Hardware design languages Video coding Optical devices Digital multimedia broadcasting Real time systems

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VSIP : Video Specific Instruction Set Processor for H.264/AVC

VSIP : Video Specific Instruction Set Processor for H.264/AV...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Kwang Woo Lee Sung Dae Kim Myung H. Sunwoo School of Electrical and Computer Engineering Ajou University Suwon South Korea

H.264/AVC adopts new features compared with previous multimedia algorithms. It is inefficient to implement some of the new features with existing DSP instructions. This paper presents an application specific instruction set processor (ASIP) for implementation of H.264/AVC, called VSIP. The proposed VSIP has novel instructions for new features, such as intra prediction, deblocking filter, integer transform, etc. In addition, VSIP employs hardware accelerators for inter prediction and entropy coding. Performance comparisons show a significant improvement compared with existing DSPs. Moreover, the proposed hardware accelerators have small size and can support real-time video processing. The results indicate that VSIP is one of promising solutions for H.264/AVC

关键词： Automatic voltage control Hardware Digital signal processing Application specific processors entropy coding Application specific integrated circuits Discrete cosine transforms Filters Energy consumption Costs

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Exact solution of a p-spin model and its relationship to error correcting codes

Exact solution of a p-spin model and its relationship to err...

引用

IEEE International Symposium on Information Theory

作者： Satish Babu Korada Nicolas Macris LTHC I and C Switzerland

ISBN: (纸本)142440505X

An important quantity in the analysis of MAP decoding for LDPC codes is the conditional entropy of the input given the output. There exist conjectured formulas for this entropy derived from the replica technique and one sided bounds derived with the help of the interpolation method. In this paper we compute exactly such a quantity for a simpler spin model which retains the essential features of the communications problem. The result is a step towards a proof of the conjectured replica formula for the conditional entropy under MAP decoding

关键词： Error correction codes Parity check codes Decoding Interpolation Physics computing Electrical capacitance tomography Context modeling entropy coding Memoryless systems AWGN channels

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Distributed coding via folding functions

Distributed coding via folding functions

引用

Data Compression Conference (DCC)

作者： R. Bernardini R. Rinaldo DIEGM University of Udine Udine Italy

Summary form only given. We propose an innovative scheme for distributed coding of two correlated variables X and Y. After analyzing the proposed scheme in some detail, we compare it with joint coding via Karhunen-Loeve transform followed by uniform quantization and entropy coding. We carried out some experiments with X = Y + N, where X, Y and W are all uniform or all Gaussian, with W independent from Y. Experimental results show that the proposed distributed coding scheme has very close or better performance than the joint coding procedure in the considered cases

关键词： Lattices Decoding Quantization entropy coding Data preprocessing Rate-distortion Data compression

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Efficient Wavelet Zero-Tree Video coding Based on Wyner-Ziv coding and Lattice Vector Quantization

Efficient Wavelet Zero-Tree Video Coding Based on Wyner-Ziv ...

引用

International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Anhong Wang Yao Zhao Jing Li Taiyuan University of Science and Technology Taiyuan China Institute of Information Science Beijing Jiaotong University Beijing China

In this paper, we present a new wavelet zero-tree video coding method based on lattice vector quantization (LVQ) and Wyner-Ziv coding. It uses dependences only at decoder and develops a new intra-encoding and inter-decoding framework. In this framework, the conventional entropy coding is replaced by a low-density parity-check (LDPC) Slepian-Wolf codec and the idea of Slepian-Wolf coding is used to set partitioning in hierarchical trees (SPIHT) and lattice vector quantization completely. Experiment results suggest that our scheme can get higher PSNR and better recovered video than intra-frame SPIHT and scalar Slepian-Wolf SPIHT

关键词： Video coding Lattices Vector quantization Decoding Codecs Wavelet coefficients Parity check codes Encoding entropy coding PSNR

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A Wavelet-Based ECG Compression Algorithm Using Golomb Codes

A Wavelet-Based ECG Compression Algorithm Using Golomb Codes

引用

International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Jianhua Chen Jun Ma Yufeng Zhang Xinling Shi Department of Electronic Engineering Yunnan University Kunming China

A new wavelet-based method for the compression of electrocardiogram (ECG) data is presented. The discrete wavelet transform (DWT) is applied to the digitized ECG signal. The DWT coefficients are firstly quantized with a uniform scalar dead zone quantizer. Then, the quantized coefficients are decomposed into two parts for efficient entropy coding: a nonzero coefficient stream and a binary significance symbol stream which indicates the locations of those nonzero coefficients. The Exp-Golomb coding is used to code the lengths of runs of the zero coefficients. The Golomb-Rice coding is used to code the nonzero coefficients. Experiments on several records from the MIT-BIH arrhythmia database show that the proposed coding algorithm outperforms other recently developed ECG signal compression algorithms

关键词： Electrocardiography Compression algorithms Discrete wavelet transforms Quantization entropy coding Wavelet transforms Arithmetic Huffman coding Partitioning algorithms Frequency

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Nonlinear transform coding: polar coordinates revisited

Nonlinear transform coding: polar coordinates revisited

引用

Data Compression Conference (DCC)

作者： D.E. Ba V.K. Goyal Massachusetts Institute of Technology USA

Summary form only given. We designed a family of integer-to-integer (i2i) approximations to the Cartesian-to-polar transformation and analyzed its behavior for high-rate transform coding. Denoting (ordinary, continuous) polar coordinates by (r, 0), our precise high-rate analysis relates the performance to the differential entropies of r 2 and 0, which are often easy to evaluate. One may thus predict when there is an improvement over linear transform coding. The analysis matches our simulations for coding of Gaussian scale mixtures and other polar-separable sources. The advantage over the best linear transform coder can be large. Our hope is to extend the polar-coordinate results to a general theory for nonlinear transform coding based on i2i implementations of arbitrary nonlinear transformations

关键词： Transform coding Discrete transforms Quantization entropy coding Shape Video coding Nonlinear distortion Rate distortion theory Hypercubes Linear approximation

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Worst-case Analysis of the Low-complexity Symbol Grouping coding Technique

Worst-case Analysis of the Low-complexity Symbol Grouping Co...

引用

IEEE International Symposium on Information Theory

作者： Amir Said Hewlett Packard Laboratories Palo Alto CA USA

ISBN: (纸本)142440505X

The symbol grouping technique is widely used in practice because it allows great reductions on the complexity of entropy coding symbols from large alphabets, at the expense of small losses in compression. While it has been used mostly in an ad hoc manner, it is not known how general this technique is, i.e., in exactly what type of data sources it can be effective. We try to answer this question by searching for worst-case data sources, measuring the performance, and trying to identify trends. We show that finding the worst-case source is a very challenging optimization problem, and propose some solution methods that can be used in alphabets of moderate size. The numerical results provide evidence confirming the hypotheses that all data sources with large number of symbols can be more efficiently coded, with very small loss, using symbol grouping

关键词： Clocks entropy coding Laboratories Optimization methods Arithmetic Throughput Costs Transform coding MPEG standards Probability distribution

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An adaptive palette reordering method for compressing color-indexed image

An adaptive palette reordering method for compressing color-...

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IEEE Region 10 International Conference TENCON

作者： Ka-Chun Lui Yuk-Hee Chan Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China

An adaptive palette reordering method is proposed in this paper to reshape the statistical properties of the color index map of a color-indexed image with a dynamic palette. Unlike other reordering methods, the proposed method extracts information from both the color index map and the palette to achieve the objective. The compression performance of JPEG-LS can be significantly improved when the proposed method is used

关键词： Image coding Color Predictive coding Pixel Data mining Image storage Decoding entropy coding Codecs Statistical distributions

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Image coder using wavelet transforms

Image coder using wavelet transforms

引用

IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

作者： M. Manikandan K. Shanthi K. BhoopathyBagan Department of ECE Anna University Chennai

Image compression can be obtained by wavelet transformation of integer input data followed by quantification and coding. Invertible wavelet transforms that map integers to integers have important applications in lossless coding. Factorization of wavelet transforms is called lifting steps, which allows construction of an integer version into integer version of every wavelet transform. Significant and refinement consistent with the terminology of zero trees of wavelet coefficients. The embedded zero tree wavelet algorithm (EZW) having the properties that the bits in the bit stream are generated in order of importance, yielding a fully embedded code. We investigate the lossless compression using an image coder

关键词： Wavelet transforms Image coding Wavelet coefficients Image reconstruction Image storage Propagation losses Terminology Compression algorithms entropy coding Shape

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