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检索条件"主题词=entropy coding"

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Error resilient coding of 3D meshes

Error resilient coding of 3D meshes

引用

IEEE International Conference on Image Processing

作者： Sung-Bum Park Chang-Su Kim Sang-Uk Lee Signal Processing Laboratory Seoul National University Seoul KOREA

ISBN: (纸本)0780377508

Compressed bit streams of 3D mesh data are highly vulnerable to transmission errors due to predictive coding and entropy coding. In this work, we propose an error resilient and progressive coding scheme for 3D meshes. To make a compressed bit stream robust to transmission errors, 3D mesh data is partitioned into several segments, which are then encoded independently. In the decoder, a novel error concealment scheme is employed to improve the visual quality of corrupted segments. Simulation results show that the proposed algorithm provides a good quality reconstruction even in severe error conditions.

关键词： Partitioning algorithms Decoding Robustness Signal processing algorithms Signal processing Laboratories Predictive coding entropy coding Redundancy Propagation losses

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Direct Huffman coding and decoding using the table of code-lengths

Direct Huffman coding and decoding using the table of code-l...

引用

International Conference on Information Technology: coding and Computing (ITCC)

作者： R. Hashemian Northern Illinois University Dekalb IL USA

A new Huffman coding and decoding technique is presented. There is no need to construct a full size Huffman table in this technique; instead, the symbols are encoded directly from the table of code-lengths. For decoding purposes a new Condensed Huffman Table (CHT) is also introduced. It is shown that by employing this technique both encoding and decoding operations become significantly faster, and the memory consumption also becomes much smaller compared to the normal Huffman coding/decoding.

关键词： Huffman coding Decoding Encoding USA Councils Data compression entropy coding Binary trees Added delay Timing Information technology

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Comparison of context-based adaptive binary arithmetic coders in video compression

Comparison of context-based adaptive binary arithmetic coder...

引用

IEEE Region 8 International Symposium on Video/Image Processing and Multimedia Communications (EURASIP)

作者： M. Mrak D. Marpe S. Grgic Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Image Processing Department Fraunhofer Institute for Communications Heinrich Hertz Institute Berlin Germany

A comparison of two context-modeling methods, CABAC and GRASP, is presented with regard to applications in video compression. Both context-based entropy coding methods are tested for various probability estimation techniques, for different sources, and for different quantization parameters by using the test model of the H.264/AVC video coding standard. Our experimental results show that GRASP provides a significant gain over CABAC, especially for intra frames coded at medium to high bit-rates.

关键词： Arithmetic Video compression Image coding entropy coding Context modeling Probability Testing Video coding Statistics Image processing

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Parallel high-speed architecture for EBCOT in JPEG2000

Parallel high-speed architecture for EBCOT in JPEG2000

引用

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

作者： Yijun Li R.E. Aly M.A. Bayoumi S.A. Mashali University of Louisiana at Lafayette Lafayette Louisiana USA Electronic Research Institute (ERI) Egypt

In this paper, a parallel high-speed architecture for EBCOT is proposed, based on the parallel mode in JPEG2000. It discovers the parallelism among three passes in bit-plane coding: two passes can work on the coding operation without the addition of coding processing elements (PE) by using parallel context modeling. So it manages to make two bits encoded in one clock cycle. In order to keep high throughput and reduce the memory requirement, the pipelined pass-switching arithmetic encoder is adopted. The experimental results show that the proposed architecture reduces the processing time by more than 16.6% compared with the pass-parallel mode architecture in Chiang et al. (2002) and by more than 38% compared with the serial mode architecture in Chen et al. (2001).

关键词： Image coding Arithmetic Transform coding ISO standards IEC standards entropy coding Code standards Tiles Wavelet transforms Discrete wavelet transforms

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Rate adjustable speech coding by lattice quantization

Rate adjustable speech coding by lattice quantization

引用

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

作者： F. Norden T.Z. Shabestary P. Hedelin Information Theory Chalmers University of Technology Gothenburg Sweden

We address speech coding architectures, suited for channels such as packetized networks. We adopt the analysis-by-synthesis paradigm. To achieve operability at a continuum of rates, all explicit perceptual filtering in the codebook search is eliminated, and quantization is performed with lattice quantizers. In this particular implementation, rate-distortion performance is improved by entropy coding of the lattice indices. The result is a competitive coder applicable to both speech and music, where subjective as well as objective performance scales well with the rate of the coder.

关键词： Speech coding Lattices Quantization Filters Filtering entropy coding Information theory Rate-distortion Speech analysis Vectors

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Nested quantization and Slepian-Wolf coding: a Wyner-Ziv coding paradigm for i.i.d. sources

Nested quantization and Slepian-Wolf coding: a Wyner-Ziv cod...

引用

IEEE/SP Workshop on Statistical Signal Processing (SSP)

作者： Zixiang Xiong A.D. Liveris S. Cheng Zhixin Liu Department of Electrical Engineering Texas A and M University College Station TX USA

A new paradigm for Wyner-Ziv coding of i.i.d. sources is proposed that consists of nested quantization and Slepian-Wolf coding. The former plays the role of quantization with side information (at the decoder) and the latter lossless coding with side information. The proposed Slepian-Wolf coded nested quantization (SWC-NQ) framework generalizes the classic source coding approach of quantization and lossless/entropy coding. The main thrust is to treat Wyner-Ziv coding as a source-channel coding problem in which the side information is taken into account in the channel coding component via binning. For Gaussian sources with MSE measure, assuming nested lattice quantization with ideal Slepian-Wolf coding and high rate, we establish system performance bounds of SWC-NQ similar to those in classic source coding, showing that 1-D/2-D nested lattice quantization performs 1.53/1.36 dB worse than the Wyner-Ziv distortion-rate function D/sub WZ/{R). Using nested lattices in higher dimensions or nested trellis-coded quantization (TCQ) could possibly approach D/sub WZ/(R) even further. We implement 1-D and 2-D nested lattice quantization, together with irregular low-density parity-check (LDPC) codes for Slepian-Wolf coding, obtaining performance close to the corresponding theoretical limits.

关键词： Quantization Lattices Source coding Parity check codes Decoding entropy coding Channel coding Distortion measurement System performance Performance evaluation

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A scalable digital audio encoder based on embedded zerotree wavelet

引用

International Conference on Communication Technology (ICCT)

作者： Jianxin Yan Zaiwang Dong Weibei Dou Department of Electronic Engineering Tsinghua University Beijing China

ISBN: (纸本)7563506861

In this paper, a scalable audio scheme is presented, which is mainly based on an embedded zerotree wavelet (EZW) coding technology. Firstly, 29 critical subbands are obtained by splitting audio signals with a digital wavelet package transform (DPWT). Then a zerotree coding is acted on these subbands. Lastly, an entropy coding is applied to remove redundancy and a specific frame structure is formed. The resulting encoder can support a scalable bit stream from 16 kbps to 64 kbps with a 4 kbps step size for a single audio channel and the graceful degeneration of subjective audio quality can also be provided.

关键词： Psychoacoustic models Audio coding Frequency Packaging Wavelet transforms Streaming media Psychology Signal processing entropy coding MPEG 4 Standard

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引用

IEEE International Conference on Image Processing

作者： Lin Luo Feng Wu Shipeng Li Zhenquan Zhuang University of Science and Technology Hefei Anhui China Microsoft Research Asia Beijing China

ISBN: (纸本)0780377508

This paper proposes an efficient layer-correlated scheme to educe the bit cost for motion vectors in the 3D wavelet coding, previous works show that incorporating motion alignment into lifting structure enables the 3D wavelet coding to provide a competitive performance to the state-of-the-art JVT standard. In general, the temporal wavelet decomposition consists of multiple layers, while each layer adopts one set of motion vectors to achieve high coding efficiency and temporal scalability. Since the current schemes code these MVs independently, this greatly increases the bit cost for coding MV. In order to reduce the motion cost, the proposed scheme performs motion estimation considering the MV correlation among layers. Several modes are proposed to describe the different local correlations at the macroblock level. By an R-D optimized mode selection engine, the proposed scheme can save up to 33% bits of MVs at the similar texture quality.

关键词： Motion estimation Video coding Costs Codecs Scalability Engines Wavelet transforms entropy coding Filters Yarn

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A coding method for UVLC targeting efficient decoder architecture

A coding method for UVLC targeting efficient decoder archite...

引用

International Symposium on Image and Signal Processing and Analysis

作者： Shang Xue B. Oelmann Department of Information Technology and Media Mid Sweden University Sundsvall Sweden

ISBN: (纸本)953184061X

Variable length code (VLC) is used in a large variety of lossless compression applications. A specially designed VLC, called "universal variable length code" (UVLC), is utilized in the latest video coding standard H.26L under development. In this work we propose a coding method that we call "alternating coding" (ALT coding) for UVLC. An efficient UVLC decoder is designed (ALT decoder) on the basis of it. ALT coding facilitates a much easier decoding scheme for UVLC. It frees the decoder from codeword tables and the sizes of the barrel shifters are reduced. The codeword tables and barrel shifters usually occupy the largest portion of the area in the traditional VLC decoders and they are also performance limiting in terms of speed and power consumption. We compare the ALT decoder with one of the most efficient VLC decoders called "VLC decoder using plane separation" (PLS). Our results show that the ALT decoder increases 257% in speed, decreases 41% in size, and consumes 45% power of the PLS decoder.

关键词： Decoding Video coding Code standards entropy coding Information technology Standards development Energy consumption Image coding Discrete cosine transforms Throughput

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Conditional entropy coding of DCT coefficients for video compression

Conditional entropy coding of DCT coefficients for video com...

引用

Conference on Image and Video Communications and Processing 2000

作者： Sipitca, M Gillman, D Georgia Tech Sch Elect & Comp Engn Atlanta GA 30322 USA

ISBN: (纸本)0819435929

We introduce conditional Huffman encoding of DCT run-length events to improve the coding efficiency of low- and medium-bit rate video compression algorithms. We condition the Huffman code for each run-length event on a classification of the current block. We classify blocks according to coding mode and signal type, which are known to the decoder, and according to energy, which the decoder must receive as side information. Our classification schemes improve coding efficiency with little or no increased running time and some increased memory use.

关键词： video compression DCT compression MPEG H.263 entropy coding conditioning energy

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