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检索条件"主题词=arithmetic coding"

共 493 条记录，以下是401-410 订阅

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Cipherstream Covering for Secure Data Compression

Cipherstream Covering for Secure Data Compression

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IEEE International Conference on Systems, Man and Cybernetics (SMC)

作者： Metzler, Richard E. L. Agaian, Sos S. Univ Texas San Antonio Dept Elect & Comp Engn San Antonio TX 78249 USA

ISBN: (纸本)9781457706530

Because of its ability to compress and encrypt plaintext simultaneously, embedment of stream cipher rules into Elias-type entropy encoders provides a fast and secure means of data compression with the ability to hide cipherstream information in the case of a known plaintext attack. Compression and security improve by continually updating the statistical representation of the plaintext. Simulations on images from a variety of classes compare the compression ratios and computational costs of the novel system to those of traditional compression-followed-by-encryption methods.

关键词： compression encryption stream cipher security arithmetic coding range coding Elias coding comcryption concryption

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On a new remote sensing data compression technique using wavelet decomposition and related procedures 4

On a new remote sensing data compression technique using wav...

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Conference on Image and Signal Processing for Remote Sensing IV

作者： Chen, CH Cheng, TH Univ Massachusetts Dept Elect & Comp Engn N Dartmouth MA 02747 USA

ISBN: (纸本)0819429597

Many image compression techniques have been developed for remote sensing imagery over the last thirty years. What are considered as standard techniques such as the use of principal component analysis, discrete cosine transform, predictive coding, etc. have shown their limitations. Wavelet transform techniques have been increasingly used in recent years. In this paper a new and efficient technique is presented that provides a nearly lossless compression of the multichannel remote sensing imagery by combining the use of wavelet decomposition, non-uniform quantization, arithmetic coding, and geometric vector quantizer (GVQ) to achieve the compression task with very minimal loss. The detailed procedures will be illustrated with real remote sensing images.

关键词： image compression wavelet transform vector quantization arithmetic coding remote sensing SAR images

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A Time-Effective Lossless Coder Based on Hierarchical Contexts and Adaptive Predictors

A Time-Effective Lossless Coder Based on Hierarchical Contex...

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IEEE Mediterranean Electrotechnical Conference

作者： Ulacha, Grzegorz Ski, Ryszard Stasi Tech Univ Szczecin Dept Comp Sci Szczecin Poland Poznan Univ Tech Fac Elect & Telecommun Poznan Poland

ISBN: (纸本)9781424416325

In the paper an efficient and time-effective lossless coding technique is presented. The method is context-based, three principal contexts are defined, for neighborhoods with special properties three auxiliary contexts are used. A simple predictor adaptation technique, being extension of ALCM algorithm, is implemented, hence, it is proposed to denote the new method as ALCM(+). A sophisticated formula for correcting the cumulated predictor error combining 8 bias estimators is calculated. Performance of the new algorithm has been tested on the set of 9 widely used benchmark images. It has been shown that indeed, the new technique has been time-effective while it has outperformed the well known methods having reasonable time complexity, like CALIC or JPEG-LS, and has been inferior only to those that are extremely computationally complex.

关键词： image coding lossless coding data modeling context coding linear predictor cumulated predictor error arithmetic coding adaptive predictor

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Image Compression Algorithms Based on Dual Tree-Complex Wavelet Transform 2

Image Compression Algorithms Based on Dual Tree-Complex Wave...

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2nd World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)

作者： Wang, Jing Wang, Wenju Wang, Xiaohong Univ Shanghai Sci & Technol Coll Commun & Art Design Shanghai 200093 Peoples R China

ISBN: (纸本)9781728150451

Aiming to improve the efficiency of image compression on the premise of controlling the compression time, an image compression oriented algorithm is proposed based on Dual Tree-Complex Wavelet and arithmetic coding algorithm. Methods : decompose the read-in image by Dt-cwt, then using Wellner (an adaptive binarization method) to calculate the image's threshold. Scan the image by EZW algorithm,and compared the threshold with wavelet coefficients,then output the important coefficients and compress these data by arithmetic coding. Finally, the compressed image was output by encoding inverse transform. Results :Four-level decomposition of Dual Tree-Complex Wavelet and seven-times scanning of the image have better compression result and shorter running time. Conclusion :The hardware configuration of this method is simple, and this algorithm can compress the image with high quality in a short time.

关键词： Dual Tree-Complex Wavelet EZW algorithm arithmetic coding threshold compress

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Area and Power Efficient 8K Real-Time Design for AV1 arithmetic Decoding

Area and Power Efficient 8K Real-Time Design for AV1 Arithme...

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Picture coding Symposium (PCS)

作者： Gomes, Jiovana Sousa Bitencourt, Tulio Pereira Bampi, Sergio Livi Ramos, Fabio Luis Fed Univ Pampa Bage RS Brazil Univ Fed Rio Grande do Sul Informat Inst Porto Alegre RS Brazil

ISBN: (纸本)9781665492577

The increasing demand for video media over limited bandwidth is currently an issue for both industry and academia. In the face of that challenge, AV1 is a recent video codec designed to compress videos efficiently. As the first step of AV1 playback, the codec utilizes a multi-alphabet arithmetic decoder as the entropy decoder kernel, with up to sixteen symbols. Hence, to accomplish a compromise trade-off between area, power, and real-time performance, we proposed MultiAD, an AV1 arithmetic decoder architecture. The presented design can decode a symbol of an alphabet with up to four elements in a single cycle, requiring more cycles for larger alphabets. When compared to the baseline prior-art architecture, MultiAD saves up to 58.3% in area and consumes 62.1% less power, while still accomplishing the 8K real-time video processing constraints.

关键词： video compression hardware design AV1 arithmetic coding

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Compression of samplable sources

Compression of samplable sources

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19th IEEE Annual Conference on Computational Complexity

作者： Trevisan, L Vadhan, S Zuckerman, D Univ Calif Berkeley Div Comp Sci Berkeley CA 94720 USA Univ Texas Dept Comp Sci Austin TX 78712 USA Harvard Univ Div Engn & Appl Sci Cambridge MA 02138 USA

ISBN: (纸本)0769521207

We study the compression of polynomially samplable sources. In particular, we give efficient prefix-free compression and decompression algorithms for three classes of such sources (whose support is a subset of {0,1}(n)). 1. We show how to compress sources X samplable by logspace machines to expected length H(X)+O(1). Our next results concern flat sources whose support is in P. 2. If H(X) <= k=n-O(log n), we show how to compress to expected length k+polylog(n-k). 3. If the support of X is the witness set for a self-reducible NP relation, then we show how to compress to expected length H(X)+5.

关键词： expander graphs arithmetic coding randomized logspace pseudorandom generators approximate counting

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A New Method For Image Watermarking Based On Reversible Technique 16

A New Method For Image Watermarking Based On Reversible Tech...

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7th International Conference on Computing, Communication and Networking Technologies (ICCCNT)

作者： Ahammed, Ameena Reeba, R. Sree Buddha Coll Engn Dept Comp Sci & Engn Alappuzha India

ISBN: (纸本)9781450341790

Protection and illegal redistribution of digital data become an important issue due to the usage of internet by more people. It increases the accessing of multimedia data for different illegal purposes. Digital watermarking can be used to prevent this illegal manipulations and distributions. It provides a robust solution to the intellectual property rights problem for online information. Digital watermarking have applications in different areas like broadcast monitoring, copy right protection etc. Sometime it is crucial to restore the original image without any distortions in some areas like law, medical and military system. Reversible watermarking techniques can be used for this purpose. Reversible watermarking is used to completely restore the original image This paper propose a robust method of digital watermarking for protecting digital information and recovering original image. For this purpose, arithmetic coding and Huffman coding techniques are used.

关键词： Watermarking Gaussian filtering pseudorandom noise HFCM Huffman coding arithmetic coding

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Efficient multimedia data encryption based on flexible QM coder

Efficient multimedia data encryption based on flexible QM co...

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6th Conference on Watermarking of Multimedia Contents

作者： Xie, D Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819452092

Efficient multimedia encryption algorithms are fundamental to multimedia data security because of the massive data size and the need of real-time processing. In this research, we present an efficient encryption scheme, called the RCI-QM coder, which achieves the objective of encryption with a regular QM coder by applying different coding conventions to encode individual symbols according to a statistically random sequence. One main advantage of our scheme is the negligible computation cost associated with encryption. We also demonstrate with cryptanalysis that the security level of our scheme is high enough to thwart most common attacks. The proposed RCI-QM coder is easy to implement in both software and hardware, while providing backward compatibility to the standard QM coder.

关键词： multimedia data security multimedia encryption arithmetic coding QM coder MSI coder random coding convention interleaving RCI-QM coder

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Fast adaptive arithmetic code for large alphabet sources with asymmetrical distributions

Fast adaptive arithmetic code for large alphabet sources wit...

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IEEE International Symposium on Information Theory

作者： Ryabko, B Rissanen, J Siberian State Univ Telecommun & Comp Sci Novosibirsk 630102 Russia Tampere Univ Technol FIN-33101 Tampere Finland

ISBN: (纸本)0780375017

We address the problem of constructing an adaptive arithmetic code in the case where the source alphabet is large and there are lots of different symbols with equal counts of occurrence. For an alphabet of N symbols and r distinct symbol weights we describe a code for which the number of operations needed for encoding and decoding is equal to c log r+c(1) instead of c log N+c(2) as in previous arithmetic codes, c, c(1), c(2) are constants. When r is small relative to N-which is the case for most practical coding problems on large alphabets-the encoding and decoding speed of the suggested code will be substantially greater than with known methods.

关键词： adaptive algorithm arithmetic coding cumulative probabilities data compression fast algorithms source coding

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Efficient Architecture for 3-D Medical Image Compression Using CABAC

Efficient Architecture for 3-D Medical Image Compression Usi...

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International Conference for Innovation in Biomedical Engineering and Life Sciences (ICIBEL)

作者： Muharam, A. Ahmad, A. Univ Tun Hussein Onn Malaysia UTHM VLSI Architecture & Syst Design Res Microelect & Johor Baharu Malaysia Univ Tun Hussein Onn Malaysia UTHM Fac Elect & Elect Engn Dept Comp Engn Embedded Comp Syst EmbCoS Focus Grp Johor Baharu Malaysia Univ Tun Hussein Onn UTHM Johor Baharu Malaysia

ISBN: (纸本)9789811002663;9789811002656

This paper describes the design and implementation of context based adaptive binary arithmetic coding (CABAC) and comparative analysis of grey scale image with discrete wavelet transform (DWT) and without DWT for three dimensional (3-D) medical image compression systems. The proposed system architectures were synthesis in MATLAB. An in-depth performance analysis for simulation is presented. Overall, CT and MRI modalities with DWT outperform in term of compression ratio, PSNR and latency compare with images for CT and MRI without DWT process.

关键词： Discrete wavelet transform (DWT) arithmetic coding context based adaptive binary arithmetic coding (CABAC)

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