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检索条件"主题词=entropy coding"

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Design of High Speed Cavlc Decoder for H.264/AVC

Design of High Speed Cavlc Decoder for H.264/AVC

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Myungseok Oh Wonjae Lee Jaeseok Kim School of Electrical and Electronic Engineering Yonsei University Seoul South Korea

In this paper, we propose a high speed CAVLC (Context-based Adaptive Variable Length coding) decoder for H.264/AVC. The previous hardware architectures perform five steps in series to obtain the syntax elements to restore the residual and the codeword length to get next input bitstream (we call it 'valid bits'). Since several cycles are required for the process of getting the valid bits and it has to be iterated several times during CAVLC process, the decoding time is increased. This paper proposes two techniques to reduce the computational cycles for valid bits. One is an improved reduced decoding step from five to four by combining total_coeff step and trailing_ones step into one step. The other is to get the valid bits directly by shifting additional shifter register instead of using controller and accumulator. By adopting these two techniques, the required processing time was reduced by 26% compared with previous architectures. It was designed in a hardware description language and total logic gate count was 14.2k using 0.18um standard cell library.

关键词： Automatic voltage control Video coding Iterative decoding entropy coding ISO standards Design engineering Registers Hardware design languages Logic gates Logic design

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Dual set arithmetic coding and its applications to image coding

Dual set arithmetic coding and its applications to image cod...

引用

European Signal Processing Conference (EUSIPCO)

作者： Bin Zhu Enhui Yang Ahmed H. Tewfik Department of Electrical Engineering University of Minnesota Minneapolis MN 55455 USA

Arithmetic coding is usually implemented in fixed precision. Such an implementation cannot efficiently code sources, such as image coding algorithms, that locally produce a small fraction of a large alphabet of symbols. In this paper, we propose a novel approach to overcome this inefficiency. The proposed algorithm uses dual symbol sets: a primary symbol set that contains the symbols that have occurred in the recent past and a secondary symbol set that contains all other symbols. Both sets are dynamically adapted to the local statistics. We summarize an analysis of the proposed approach and describe the results that we have obtained by applying it to images.

关键词： Image coding Transform coding Probability Frequency estimation Bit rate entropy coding

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Coder-oriented matching criteria for motion estimation

Coder-oriented matching criteria for motion estimation

引用

International Workshop on Wireless Image/Video Communications

作者： P.J. Czerepinski D.R. Bull Image Communications Group Centre for Communications Research University of Bristol Bristol UK

Classical matching criteria for motion estimation determine the match quality by operating in the spatial domain. The resulting displaced frame difference signal is, however, compressed by means of frequency transformations, and any optimal matching criteria should estimate the cost of coding the composite bit stream. Such criteria are presented in this paper and shown to offer some improvement in the PSNR of the reconstructed sequence.

关键词： Motion estimation Image reconstruction Discrete cosine transforms Quantization Design for disassembly Video coding entropy coding Image communication Frequency Optimal matching

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LIKELIHOOD CODEBOOK REORDERING VECTOR QUANTIZATION

LIKELIHOOD CODEBOOK REORDERING VECTOR QUANTIZATION

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Chu Meh Chu David V. Anderson School of Electrical and Computer Engineering Georgia Institute of Technology

ISBN: (纸本)9781479903573

In this paper, a reordering vector quantization algorithm based on conditional probabilities of a codebook transition matrix is implemented. The dynamic reordering of the codebook dramatically decreases the entropy for temporally structured sources, enabling a second stage of entropy coding to further improve the efficiency of VQ. Results from synthetic, Markov sources and speech sources are shown to outperform other baseline vector quantization algorithms.

关键词： Vector quantization entropy coding Compression Vector quantization entropy coding compression REORDERING Quantization codebook entropy Conditional probability

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Near-Lossless Image Compression Based on Maximization of Run Length Sequences

Near-Lossless Image Compression Based on Maximization of Run...

引用

IEEE International Conference on Image Processing

作者： E. Nasr-Esfahani S. Samavi N. Karimi S. Shirani Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran Department of Electrical and Computer Engineering McMaster University ONT Canada

In this paper an algorithm is proposed which performs near-lossless image compression. For each pixel in a row of the image a group of value-states are considered, which have values close to that of the pixel. A trellis is constructed for every row of the image where the nodes of the trellis are the states of the pixels of that row. The goal of the algorithm is to find a path on this trellis that creates a sequence which can be efficiently coded using run length encoding (RLE). For sections of the pixels of the row that suitable RLE cannot be achieved then minimization of the entropy is employed to complete a path on the trellis. The application of the algorithm to a wide range of standard images shows that the scheme, while having low computational complexity, is competitive with other near-lossless image compression methods.

关键词： Image coding Pixel Discrete wavelet transforms Biomedical imaging entropy coding Image reconstruction Discrete cosine transforms Pulse modulation Computational complexity Teleconferencing

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Design of successive approximation lattice vector quantizers

Design of successive approximation lattice vector quantizers

引用

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

作者： S.F. Simon L. Bosse Institut für Nachrichtentechnik RWTH Aachen University of Technology Aachen Germany

Two methods to overcome the problems with large vector quantization (VQ) codebooks are lattice VQ (LVQ) and product codes. The approach described in this paper takes advantage of both methods by applying residual VQ with LVQ at all stages. Using LVQ in conjunction with entropy coding is strongly motivated by the fact that entropy constrained but structurally unconstrained VQ design leads to more equally sized VQ cells. The entropy code of the first LVQ stage should aim at exploiting the statistical properties of the source. The refinement LVQ stages quantize the residuals. Simulations show that there exist certain scales of the refinement lattices yielding extraordinary performance. We focus on the search of these scales.

关键词： Lattices Product codes entropy coding Vector quantization Shape Bit rate Source coding Video coding Books Decoding

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New CAVLC encoding algorithm for lossless intra coding in H.264/AVC

New CAVLC encoding algorithm for lossless intra coding in H....

引用

Picture coding Symposium, PCS

作者： Jin Heo Seung-Hwan Kim Yo-Sung Ho Gwangju Institute of Science and Technology Gwangju South Korea

Context-based adaptive variable length coding (CAVLC) of H.264/AVC was originally designed for quantized transform coefficients in lossy video coding, and as such does not yield adequate performance in lossless video coding. In this paper, we propose an improved CAVLC for lossless intra coding. Considering statistical differences of residual data in lossy and lossless coding, we design a new CAVLC encoding algorithm. Experimental results show that the proposed method provides approximately 7.6% bit savings, compared to the current H.264/AVC FRExt high profile.

关键词： Encoding Automatic voltage control Video coding Pulse modulation entropy coding Performance loss Standards development Video compression Quantization Algorithm design and analysis

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Optimized compression of triangle mesh geometry using prediction trees

Optimized compression of triangle mesh geometry using predic...

引用

International Symposium on 3D Data Processing Visualization and Transmission

作者： B. Kronrod C. Gotsman Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Almost all triangle mesh compression algorithms to date are driven by the mesh connectivity code. The geometry code usually employs a straightforward prediction method applied to the vertex sequence as dictated by the connectivity code. This generates a suboptimal geometry code, which results in significant loss in code efficiency, since the geometry dominates the mesh information content. The paper proposes a manifold mesh code which optimizes the geometric component, at the slight expense of the connectivity code. This mesh geometry code is shown to be up to 50% more compact than the state-of-the-art geometry code of Touma and Gotsman (1998), especially for models with non-smooth geometry, such as CAD models.

关键词： Mesh generation Solid modeling Prediction methods Information geometry Computational geometry Computer science Compression algorithms Decoding Distortion measurement entropy coding

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Index Assignment Optimization for Joint Source-Channel MAP Decoding

Index Assignment Optimization for Joint Source-Channel MAP D...

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Xiaohan Wang Xiaolin Wu Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada

Channel-optimized quantizer index assignment and maximum a posteriori (MAP) decoding have been extensively studied for error-resilient communications. An interesting and largely untreated problem is how to optimize the index assignment with respect to joint source-channel MAP decoding. In this paper we formulate the above problem as one of quadratic programming, and discuss its solutions from very general to some special cases. Experimental results are presented to demonstrate the performance improvement of the index assignments optimized for MAP decoding over those designed for hard-decision decoding.

关键词： Decoding Redundancy Quadratic programming Design optimization Wireless sensor networks entropy coding Reflective binary codes Information theory Conferences Computer errors

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An UVLC encoder architecture for H.26L

An UVLC encoder architecture for H.26L

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Tu-Chih Wang Hung-Chi Fang Wei-Min Chao Hong-Hui Chen Liang-Gee Chen DSP/IC Design Laboratory EE Department National Taiwan University Taiwan

ISBN: (纸本)0780374487

Variable length code (VLC) is widely used in various compression applications. The latest under development video coding standard, H.26L, uses a unique pattern VLC code called UVLC in the test model document. In this paper, an UVLC encoder architecture is proposed to meet the requirements of TML8. This architecture is composed of a code splitter, a first 1 detector, a shifter, a length accumulator, and a code mux/output. A modified code number technique and auto self alignment technique are used to simplify the architecture. By using these techniques, the size of this architecture is much smaller when compared to traditional VLC encoders. It has been synthesized in a 0.35 /spl mu/m cell library. The size of this architecture is 980 gates while critical path is less than 6 ns.

关键词： entropy coding Video coding Testing Decoding Parallel architectures Chaos Digital signal processing Application specific integrated circuits Laboratories Code standards

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