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Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： A. Conci F.R. Aquino IC-Instituto de Computação CAA-Computação Aplicada e Automação Automação Universidade Federal Fluminense UFF Niteroi Rio de Janeiro Brazil

In automatic fractal image compression, most of the encoding time is spent on finding the best match between each range block and the domain blocks. We propose the use of the local complexity of the image domain blocks to reduce the number of pairs to be tested on this search. Indexing the contracted domain pools according to their local fractal dimension and using multiple contraction factors we can confine all potential matches to a relatively small number of possibilities. By selecting an appropriate criterion for close match, the compression time can be shortened without image quality degradation. The performance of the proposed algorithm, evaluated by means of fidelity versus encoding time and compression ratio, is compared with five approaches. Future developments can also improve the compression ratio by using fractal dimension in the definition of the size of range blocks.

关键词： Fractals Image coding compression algorithms Image quality Image storage Testing Indexing Partitioning algorithms Frequency Image analysis

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Progressively authenticated image transmission

Progressively authenticated image transmission

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MILCOM, Military Communications Conference

作者： M. Steinder S. Iren P.D. Amer Computer and Information Science Department University of Delaware Newark DE USA

Network-conscious image compression has been shown to provide faster progressive display than traditional compression algorithms, when images are transmitted over lossy low-bandwidth packet-switched networks. In this paper, we combine the advantages of wavelet-based, network-conscious image compression with a blind digital image signature technique. Together these two approaches investigate progressive display where each progressive image can be authenticated by the receiver in real time.

关键词： Image communication Image coding Propagation losses Bandwidth Digital signatures Watermarking Computer displays compression algorithms Digital images Wireless networks

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Error resilient image coding for radio channels

Error resilient image coding for radio channels

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IEEE Conference on Vehicular Technology (VTC)

作者： P. Chippendale B. Honary Lancaster Communications Research Centre Lancaster University UK

This paper explores the application of the error resilient coding scheme, absolute addressed picture element coding (APEL), to progressive image transmission over narrow-band radio channels, such as HF. Picture element (pel) interleaving strategies are explored and APEL coding and its merits are discussed. Demonstrated through air-trial results, this novel image coding approach are shown to restrict error propagation through its unique coding structure and offer reconstructed images of increasing definition as transmissions progress.

关键词： Image coding Error correction Interleaved codes Robust control Protection Decoding Image communication Narrowband Image reconstruction compression algorithms

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Wavelet-based embedded memory reduction for MPEG decoder

Wavelet-based embedded memory reduction for MPEG decoder

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IEEE Workshop on Multimedia Signal Processing

作者： C.-W.J. Shih T. Ogunfunmi Nam Ling Elect. Engineering Department Santa Clara University Santa Clara CA USA Cmpt. Engineering Department Santa Clara University Santa Clara CA USA

In MPEG-2 HDTV, the bandwidth and size of memory requirements are very large. These requirements increase the system design difficulty and the hardware cost is high. There are a lot of compression algorithms that can reduce the size of the memory, but the algorithms are too complex. We propose a simple algorithm to provide low complexity hardware and high quality video. Our algorithm is based on the wavelet transform (WT) and we use two integer wavelet bases, so there are no multipliers needed. This will reduce the cost a lot in VLSI implementation. Following the WT, we use a variable-length coder to encode the data. For the memory access problem, we use group of macroblock segment coding and a hierarchical access method to reduce the access time.

关键词： Decoding Transform coding Hardware Costs HDTV Bandwidth compression algorithms Video compression Wavelet transforms Very large scale integration

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Multi-level encoding and placement techniques for multi-resolution video streams on a disk array

Multi-level encoding and placement techniques for multi-reso...

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IEEE Region 10 International Conference TENCON

作者： Jinhwan Kim Namyun Kim Heonshik Shin School of Information and Computer Engineering Hansung University South Korea Department of Computer Engineering Seoul National University South Korea

We propose multi-level encoding and placement techniques to efficiently support the retrieval of video streams on a disk array at different resolutions. For the MPEG-1 compression algorithm, this encoding technique first partitions the parent video stream in the temporal dimension. Each frame in the sub-stream is then partitioned in the chroma dimension yielding a low-resolution and a residual component. The server stores blocks of a component on a disk and stores blocks of different components on consecutive disks in a round-robin manner. The lower the resolution level being maintained, the smaller is the number of disks accessed by each client.

关键词： Encoding Streaming media Video compression Bandwidth Delay Electronic mail Information retrieval Transform coding compression algorithms Costs

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Image denoising based on scale-space mixture modeling of wavelet coefficients

Image denoising based on scale-space mixture modeling of wav...

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IEEE International Conference on Image Processing

作者： Jian Liu P. Moulin ECE Department Beckman Institute University of Illinois Urbana IL USA

In this paper, we propose a novel hierarchical statistical model for image wavelet coefficients. A simple classification scheme is used to construct a model that captures interscale and intrascale dependencies of wavelet coefficients. Applications to image denoising are presented. We develop a simple algorithm that outperforms other wavelet denoising schemes that exploit first order statistics, or inter- or intra-scale dependencies alone.

关键词： Image denoising Wavelet coefficients Hidden Markov models Noise reduction Statistical distributions Higher order statistics Gaussian distribution Image restoration Image coding compression algorithms

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Combining motion estimation with feature extraction in MPEG video coders

Combining motion estimation with feature extraction in MPEG ...

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EUROMICRO Conference

作者： P. Baglietto A.L. Frisiani DIST-University of Genoa Genoa Italy

General purpose motion estimation algorithms do not exploit the information available about the fixed characteristics of the video sequences in specific application domains. In this paper we propose to take advantage of such information to develop efficient video compression algorithms and we apply the proposed approach to the highway monitoring application domain. The proposed approach allows also extracting selected features at the video compression level and more specifically those features related to object movements.

关键词： Motion estimation Feature extraction Transform coding Video compression Road transportation Video sequences Monitoring Electrical capacitance tomography MPEG standards compression algorithms

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SICLIC: a simple inter-color lossless image coder

SICLIC: a simple inter-color lossless image coder

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Data compression Conference (DCC)

作者： R. Barequet M. Feder Department of EE-Systems Tel-Aviv University Tel-Aviv Israel

Many applications require high-quality color images. In order to alleviate storage space and transmission time, while preserving high quality, these images are losslessly compressed. Most of the image compression algorithms treat the color image, usually in RGB format, as a set of independent gray-scale images. SICLIC is a novel inter-color coding algorithm based on a LOCO-like algorithm. It combines the simplicity of Golomb-Rice coding with the potential of context models in both intra-color and inter-color encoding. It also supports intra-color and inter-color alphabet extension, in order to reduce the redundancy of the code. SICLIC attains compression ratios superior to those obtained with most of the state-of-the-art compression algorithms and achieves compression ratios very close to those of inter-band CALIC, with much lower complexity. With arithmetic coding, SICLIC attains better compression than inter-band CALIC.

关键词： Image coding Color Image storage Propagation losses Gray-scale Context modeling compression algorithms Arithmetic

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A novel family of compression algorithms for ECG and other semiperiodical, one-dimensional, biomedical signals

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IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 1996年第8期43卷 820-828页

作者： Barlas, GD Skordalakis, ES NATL TECH UNIV ATHENS DIV COMP SCI GR-15310 ATHENS GREECE

In this paper, a novel family of compression algorithms is presented, which is designed to exploit the redundancy of one-dimensional (1-D) semiperiodical biomedical signals resulting from the cyclic nature of the underlying physical process, The basic idea is that a pool of past-seen cycles is maintained and cycles to be encoded can be stored as transformed versions of those residing in the pool, Conceptually, this approach is an extension of dictionary-based coding schemes used for text compression to signal patterns residing in an n-dimensional space. A cycle transformation method is introduced in order to render the pattern matching process practical and to enable cycle substitution, Based on the principles of the algorithmic family and this transformation method, an electrocardiogram (ECG)-oriented algorithm is implemented and thoroughly tested. The performance of this implementation is examined theoretically and deductions about the optimal algorithm settings are made, The ECG compression algorithm is superior to the average beat subtraction algorithm as proposed by Hamilton and Tompkins in cases where high compression ratios are required.

关键词： compression algorithms Electrocardiography Signal processing Signal analysis Computer science Signal design Algorithm design and analysis Pattern matching Testing Parameter extraction

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compression of multichannel ECG through multichannel long-term prediction

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IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE 1998年第1期17卷 109-115页

作者： Cohen, A Zigel, Y Ben Gurion Univ Negev Dept Elect & Comp Engn IL-84105 Beer Sheva Israel

The need for efficient coding of ECG signals is continually increasing with modern use of long-term monitoring and telemedicine. Here, the authors present an algorithm based on long-term prediction (LTP) compression. The single-channel LTP algorithm has been generalized to the multichannel case and is called the MC-LTP algorithm. This algorithm compresses PQRST beats using a pattern codebook with "typical" beats.

关键词： Electrocardiography Distortion measurement Predictive models Vectors Biomedical engineering Autocorrelation Modems Monitoring Telemedicine compression algorithms

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