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检索条件"主题词=Compression algorithms"

共 2075 条记录，以下是1971-1980 订阅

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Gradient Domain Tone Mapping of High Dynamic Range Videos

Gradient Domain Tone Mapping of High Dynamic Range Videos

引用

IEEE International Conference on Image Processing

作者： Chul Lee Chang-Su Kim School of Electrical Engineering Korea University Seoul South Korea

A gradient domain tone mapping algorithm is proposed to display high dynamic range (HDR) video sequences in low dynamic range (LDR) devices in this work. The proposed algorithm obtains a pixelwise motion vector field and incorporates the motion information into the Poisson equation. Then, by attenuating large spatial gradients, the proposed algorithm can yield a high-quality tone-mapped result without flickering artifacts. Simulation results show that the proposed algorithm provides a better performance than the frame-based method, which processes each frame independently.

关键词： Dynamic range Displays Layout Video sequences Image coding Poisson equations Pixel Digital images Digital cameras compression algorithms

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Towards compressing Web graphs

Towards compressing Web graphs

引用

Data compression Conference (DCC)

作者： M. Adler M. Mitzenmacher University of Massachusetts Amherst USA

ISBN: (纸本)0769510310

We consider the problem of compressing graphs of the link structure of the World Wide Web. We provide efficient algorithms for such compression that are motivated by random graph models for describing the Web. The algorithms are based on reducing the compression problem to the problem of finding a minimum spanning free in a directed graph related to the original link graph. The performance of the algorithms on graphs generated by the random graph models suggests that by taking advantage of the link structure of the Web, one may achieve significantly better compression than natural Huffman-based schemes. We also provide hardness results demonstrating limitations on natural extensions of our approach.

关键词： Web sites Tree graphs Testing Web pages Search engines Computer science Engineering profession Electronic mail Prototypes compression algorithms

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Constructing the CDAWG CFG using LCP-Intervals

Constructing the CDAWG CFG using LCP-Intervals

引用

Data compression Conference (DCC)

作者： Alan Cleary Jordan Dood National Center for Genome Resources Santa Fe NM USA Montana State University Bozeman MT USA

It is known that a context-free grammar (CFG) that produces a single string can be derived from the compact directed acyclic word graph (CDAWG) for the same string. In this work, we show that the CFG derived from a CDAWG is deeply connected to the maximal repeat content of the string it produces and thus has O(m) rules, where m is the number of maximal repeats in the string. We then provide a generic algorithm based on this insight for constructing the CFG from the LCP-intervals of a string in O(n) time, where n is the length of the string. This includes a novel data-structure to support stabbing queries on LCPintervals in O(1+k) time after O(n) preprocessing time, where k is the number of intervals stabbed. These results connect the CFG to properties of the string it produces and relates it to other string data-structures, allowing it to be studied independently of the CDAWG and providing opportunity for innovation of grammar-based compression algorithms.

关键词： Technological innovation Data compression Grammar compression algorithms

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Error concealment improvements for MPEG-2 using enhanced error detection and early re-synchronization

Error concealment improvements for MPEG-2 using enhanced err...

引用

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

作者： S. Aign German Aerospace Research Establishment (DLR) Institute for Communications Technology Oberpfaffenhofen Germany

For digital TV-transmission the video signal has to be highly protected by channel coding, since it is very sensitive to channel disturbances. However, in the case of bad reception conditions, remaining errors in the video signal may still occur. Hence, error concealment techniques might be required at the receiver. The aim of this article is to study different error concealment techniques for MPEG-2 video sequences by exploiting the remaining error-free part of the bitstream as much as possible. This is done by combining an enhanced error detection of the channel decoder with early re-synchronization. In I-pictures, where no motion vectors exist, the gain for early re-synchronization with enhanced error detection compared to other techniques is up to 2.3 dB.

关键词： Decoding Channel coding Error correction Communications technology Protection Video sequences Motion detection Cable TV Satellite broadcasting compression algorithms

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Control Area Network Based Quotient Remainder compression-Algorithm for Automotive Applications

Control Area Network Based Quotient Remainder Compression-Al...

引用

Annual Conference on IEEE Industrial Electronics Society

作者： Supriya Kelkar Rajkamal Cummins College of Engineering for Women School of Electronics Devi Ahilya Vishwa Vidyalaya

ISBN: (纸本)9781467324199

The present day automotives have variety of attractive features. Incorporating these features is possible with more electronics or embedded systems inside the vehicle. Controller Area Network (CAN) protocol offers low cost solution for communication between these embedded systems. These embedded systems communicate on CAN bus via message passing. With limited speed and bandwidth offered by CAN, there are limitations in communication. One of the solutions to overcome these limitations is the use of Data-Reduction (DR) algorithms or techniques. These algorithms make it possible to send fewer amount of data in the given time, thus reducing the bandwidth per message. This paper develops an alternative approach to data reduction technique called Quotient Remainder compression (QRC) algorithm. It provides double or at least equal range to the variation in the parameter as compared to the Enhanced Data Reduction (EDR) algorithm. The compression ratio of QRC is comparable to the earlier algorithms.

关键词： compression algorithms Data Reduction Automotive Applications Controller Area Network Protocol (CAN)

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Stack-run adaptive wavelet image coding

Stack-run adaptive wavelet image coding

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Data compression Conference (DCC)

作者： A.M. Awan N.M. Rajpoot S.A. Husain GIK Inst. of Engg. Pakistan Department of Computer Science University of Warwick UK

Summary form only given. An adaptive wavelet transform based on an image coder that employs a stack-run representation for quantized transform coefficients and benefits from the intra-subband redundancies is presented. The compression algorithm can be divided into four parts. First, an adaptive wavelet packet basis is selected for representing the given image using certain entropy-based cost functions. Second, the wavelet packet coefficients are quantized using an optimal scalar quantizer for Laplacian distribution. Third, the quantized coefficient is represented with stack-run coding generating a redundant symbol stream. Finally, this symbol stream is entropy coded using a higher order arithmetic coder.

关键词： Image coding Wavelet packets Filters Wavelet transforms Cost function Streaming media Entropy Computer science compression algorithms Laplace equations

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Robust Speech Coding for the Preservation of Speaker Identity

Robust Speech Coding for the Preservation of Speaker Identit...

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： M. Phythian J. Leis S. Sridharan Faculty of Engineering University of Southern Queensland Toowoomba Australia Signal Processing Research Centre Queensland University of Technology Brisbane Australia

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Video coding using 3 dimensional DCT and dynamic code selection

Video coding using 3 dimensional DCT and dynamic code select...

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Data compression Conference (DCC)

作者： M. Bauer K. Sayood Department of Electrical Engineering University of Nebraska Omaha Lincolnshire NE USA

Summary only given. We address the quality issue, and present a method for improved coding of the 3D DCT coefficients. Performance gain is achieved through the use of dynamically selected multiple coding algorithms. The resulting performance is excellent giving a compression ratio of greater than to 100:1 for image reproduction. The process consists of stacking 8 frames and breaking the data into 8/spl times/8/spl times/8 pixel cubes. The three dimensional DCT is applied to each cube. Each cube is then scanned in each dimension to determine if significant energy exists beyond the first two coefficients. Significance is determined with separate thresholds for each dimension. A single bit of side information is transmitted for each dimension of each cube to indicate whether more than two coefficients will be transmitted. The remaining coefficients of all cubes are reordered into a linear array such that the elements with the highest expected energies appear first and lower expected energies appear last. This tends to group coefficients with similar statistical properties for the most efficient coding. Eight different encoding methods are used to convert the coefficients into bits for transmission. The Viterbi algorithm is used to select the best coding method. The cost function is the number of bits that need to be sent. Each of the eight coding methods is optimized for a different range of values.

关键词： Video coding Discrete cosine transforms Video compression Biomedical imaging HDTV compression algorithms Image coding Back Bit rate Performance gain

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On board strip-based wavelet image coding for future space remote sensing missions

On board strip-based wavelet image coding for future space r...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： C. Parisot M. Antonini M. Barlaud C. Lambert-Nebout C. Latry G. Moury I3s laboratory Biot France CNES-Bpi 1421 Centre National d'Etudes Spatiales Toulouse France

Spacecraft sensor obtained data has to be stored on-board until an opportunity arises for it to be transmitted to the ground. compression algorithms used in space were based first on DPCM and then on DCT. Image quality evaluation determined however that for applications using the adaptive DCT, such as for SPOT 5, the maximum acceptable compression ratio was about 3 for high resolution observation and about 15 for scientific missions. Beyond that compression ratio, the occurrence of block effects in uniform areas and the loss of detail related to compression noise is no more acceptable for scientific use. To overcome these limits and to prepare future generations of Earth observation satellites and scientific missions, the authors propose a novel and efficient strip-based satellite image coder adapted for on board processing. The performances of their method are better than JPEG 2000 with a complexity lower than 60 operations per pixel. Furthermore, their method can be implemented for different image samplings. The authors quickly explain the general compression scheme used and the solution for on the fly DWT computation. They present the dynamic bit allocation and the regulation process chosen for rate control. Then, they evaluate the complexity and performances of their method comparatively to JPEG 2000.

关键词： Image coding Discrete cosine transforms Transform coding Space vehicles compression algorithms Image quality Image resolution Signal to noise ratio Artificial satellites Image sampling

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MPEG-2 as a transmission system for Internet traffic

MPEG-2 as a transmission system for Internet traffic

引用

IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： H.D. Clausen B. Necker T. Eder H. Linder Institute for Computing Sciences and Systems Analysis University of Salzburg Austria

MPEG-2 is an international standard defining compression algorithms for video and audio. Additionally, the standard defines a packet and cell oriented transmission system for the resulting digital streams. This system has been used as a local network to carry Internet traffic over a direct broadcast satellite. Applications have been developed for either unicast or multicast services from a base station server to a group of receiving clients. Inexpensive integrated receiver/decoder cards are used which contain a complete RF receiver, demodulator and decoder and interface directly to the PC bus. The paper describes the encapsulation and the implementation of a prototype system based on the European DVB standards which has been operational since early 1997. It then discusses some of the design decisions and suggests a generic encapsulation mechanism for future data and multimedia applications using MPEG-2 as a transport system.

关键词： Internet Transform coding Telecommunication traffic Decoding Encapsulation compression algorithms Video compression Streaming media IP networks Satellite broadcasting

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