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检索条件"主题词=Compression algorithms"

共 2076 条记录，以下是781-790 订阅

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A New Algorithm for Calculating Adaptive Character Wordlength via Estimating Compressed File Size

A New Algorithm for Calculating Adaptive Character Wordlengt...

引用

International Conference on Computer Research and Development (ICCRD)

作者： Farid Haji Zeinalabedin Nassrin Eftekhari Abolfazl Torghi Haghighat Computer & Electronic Department Researchers Club of Islamic Azad University of Iran Qazvin Iran Computer & Electronic Department Islamic Azad University Qazvin Iran

ISBN: (纸本)9781424469925;9780769540436

In statistical compression algorithms, character word length of 8 bit is being used. Using an optimum character word length, b, where b>8, will improve compression ratio. There are different ways to calculate optimum character word length. In this paper we introduce a new algorithm named Estimated Compressed File Size (ECF) to find optimum character word length by estimating compressed file size. In this new algorithm, different metrics such as header file size and entropy are effective to determine optimum character word length. The ECF algorithm is a good lower bound for estimating compressed file size. ECF is a rapid algorithm for large files and does not depend to statistical algorithms.

关键词： Data compression compression algorithms Binary codes Dictionaries Entropy Probability Huffman coding Frequency Research and development Bandwidth

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Information Theory Based WCE Video Summarization

Information Theory Based WCE Video Summarization

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International Conference on Pattern Recognition

作者： Giovanni Gallo Eliana Granata Alessandro Torrisi Dipartimento di Matematica e Informatica of Catania Italy

Wireless Capsule Endoscopy (WCE) is a technical break-through that allows to produce a video of the entire intestine without surgery. It is reported that a medical clinician spends one or two hours to assess a WCE video. It is hence useful to help the physician to do analysis diagnosis using computerized methods. In this paper an algorithmic information-theroretic method is presented for the automatic summarization of meaningful changes in video sequences extracted from WCE videos. To segment a WCE video into anatomic parts (esophagus, stomach, small intestine, colon) we use a textons-based method. The local textons histogram sequence is used for image representation and the Normalized compression Distance (NCD) measure is used to compute the similarity between images.

关键词： Endoscopes Entropy Histograms Video sequences Dictionaries Visualization compression algorithms

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Design refinement for the development of an audio dynamic range controller

Design refinement for the development of an audio dynamic ra...

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Workshop on Intelligent Solutions in Embedded Systems

作者： A. De Stephanis M. Conti M. Caldari F. Ripa Università Politecnica delle Marche Ancona Italy KORG Italy S.p.A. Osimo Italy

A fundamental issue in the development of a modern electronic design is represented by productivity: the complexity of digital systems is growing so fast that a lot of resources are required for meaningful and efficient design, guaranteeing a feasible time-to-market. Abstraction is an important tool to manage complexity, because it allows to catch the essence of an object, giving less importance to other properties, avoiding premature introduction of implementation details. For this reason it is important to adopt a methodology that can lead to the desired functionality through the creation of high-level executable models that can be easily refined and adapted to the subsequent stages of hardware and software synthesis. In this paper, this methodology is applied in the development of an audio dynamic range compressor designed for the creation of an electronic musical keyboard.

关键词： Dynamic range Signal design Control system synthesis compression algorithms Testing Debugging Collaborative work Virtual prototyping Fixed-point arithmetic Prototypes

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Collaborative Quality-of-Service based video conferencing

Collaborative Quality-of-Service based video conferencing

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International Conference on Computer Supported Cooperative Work in Design

作者： Christian Spielvogel Peter Kropf Computer Science Department University of Neuchâtel Neuchatel Switzerland

Video conferencing typically involves multiple parties who communicate over the Internet by exchanging real-time video and audio messages. The problem about Internet based real-time communication is the best effort behavior which sometimes causes erroneous transmissions that frustrate the conferencing parties. To avoid erroneous transmissions, Quality-of-Service aware video conferencing systems dynamically adapt to varying network conditions for the price of decreased video frame rate, resolution or quality. In this paper we go one step beyond Quality-of-Service awareness and present a collaborative approach for achieving the required quality in video communications that does not require adaptation in the temporal, spatial or quality domain. Instead it reuses cached video frames if the transmission of current frames is not possible. The advantage of reusing cached frames is that the real-time aspect can be maintained for small time periods without sending a single byte of video data over the network. In case of short network failures it is not even possible to realize the difference between the original video and the reused previous frames. We evaluate and compare our frame reusing approach against adaptation in the quality domain which is a well know, but highly CPU intensive and non scalable technique.

关键词： Collaboration Quality of service Videoconference Internet Collaborative work Computer science Humans Delay compression algorithms Force control

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Asymptotic optimality of antidictionary codes

Asymptotic optimality of antidictionary codes

引用

IEEE International Symposium on Information Theory

作者： Takahiro Ota Hiroyoshi Morita Department of Electronic Engineering Nagano Prefectural Institute of Technology Ueda Nagano Japan Graduate School of Information Systems University of Electro-Communications Chofu Tokyo Japan

An antidictionary code is a lossless compression algorithm using an antidictionary which is a set of minimal words that do not occur as substrings in an input string. The code was proposed by Crochemore et al. in 2000, and its asymptotic optimality has been proved with respect to only a specific information source, called balanced binary source that is a binary Markov source in which a state transition occurs with probability 1/2 or 1. In this paper, we prove the optimality of both static and dynamic antidictionary codes with respect to a stationary ergodic Markov source on finite alphabet such that a state transition occurs with probability p (0

关键词： Automata Information systems compression algorithms Dictionaries Decoding

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Performance measurement of a fully pipelined JPEG codec on emulation platform

Performance measurement of a fully pipelined JPEG codec on e...

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IEEE International Advance Computing Conference, IACC

作者： Naveen Tiwari Sagar Chaitanya Reddy Samsung India Software Operations Private Limited Bangalore Karnataka India

ISBN: (纸本)9781424447909

This paper presents the design and performance measurement of the hardware JPEG codec on an ARM926EJS emulation base board. JPEG is one of the best compression algorithms for still images. It preserves the quality with high compression ratio. JPEG codec encodes and decodes coloured as well grey image formats. The design exploits the pipeline architecture for high throughput. Overall size of the codec is controlled by sharing the common resources between JPEG encoder and decoder. Hardware JPEG codec was synthesized for Xilinx ¿ Virtex II FPGA device on ARM926EJS emulation base board. The paper covers all the RTL modifications done for performance measurement. FPGA resource utilization is tabulated at post-synthesis and post-mapping stage. Real time performance measurement is done for encoder and decoder for colored and grey images.

关键词： Measurement Codecs Emulation Transform coding Decoding Hardware Field programmable gate arrays compression algorithms Image coding Pipelines

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A Pseudo-Random Number Generator Based on LZSS

A Pseudo-Random Number Generator Based on LZSS

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Data compression Conference (DCC)

作者： Weiling Chang Binxing Fang Xiaochun Yun Shupeng Wang Xiangzhan Yu Research Centre of Computer Network and Information Security Technology Harbin Institute of Technology Harbin China Institute of Computing Technology Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424464258;9780769539942

Summary form only given. A pseudo-random sequence generator (PRNG), L12RC4, inspired by the LZSS compression algorithm and RC4 stream cipher, was presented and implemented. In LZSS, the encoded file consists of a sequence of items, each of which is either a single character (literal) or a pointer of the form (index, length). The probability distributions of the literal, length and flag bit values are different from uniform, it is worth to coding them using an entropy coding such as the Huffman or the arithmetic coding. However, the index value is defined not only by the context of data stream but also by its temporal position in the window, it has uniform or near uniform probability distribution, so we can use this characteristics to design a pseudo-random number generator.

关键词： Probability distribution Testing Data compression Computer networks Information security compression algorithms Entropy coding Arithmetic Character generation Dispersion

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Solving the out-of-gamut problem in image composition

Solving the out-of-gamut problem in image composition

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IEEE International Conference on Image Processing

作者： Wenxian Yang Jianfei Cai Jianmin Zheng School of Computer Engineering Nanyang Technological University Singapore

Existing digital image composition algorithms neglect the out-of-gamut problem, i.e. some pixel values in a composited image exceed the displayable or printable range. The commonly used solutions, including hard clipping or linear scaling, result in either detail loss or global contrast reduction. Directly applying the existing high dynamic range (HDR) compression algorithms cannot achieve pleasant visual quality either. In our previous work, we proposed a gamut fitting algorithm by formulating gamut fitting as an energy-minimization problem and used the cubic polynomial in the Bernstein-Bézier form to compute the optimal mapping curve. Despite the good performance achieved, the problem of the previous algorithm lies in the necessity of fine tuning the weighting parameter in the proposed energy function. In this paper, we further improve our previous method by using piecewise mapping curves with multiple Bernstein polynomials to find the optimal mapping curve. The proposed approach can be regarded as a post-process to enhance the visual quality of the resulting images from image composition applications. The performance of the proposed method is compared with our previous method and the state-of-the-art HDR compression algorithms.

关键词： Pixel Polynomials Visualization Dynamic range Image coding compression algorithms Tuning

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BPE Acceleration Technique for S/W Update for Mobile Phones

BPE Acceleration Technique for S/W Update for Mobile Phones

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Ryozo Kiyohara Satoshi Mii Information Technology Research and Development Center Mitsubishi Electric Corporation Limited Kamakura Japan Nagoya Works Mitsubishi Electric Corporation Limited Nagoya Japan

ISBN: (纸本)9781424466955;9780769540184

Recently, the size of the software on embedded devices, e.g., mobile phones, has been increasing rapidly. Complex processes in large scale software, such as event handlers, require bugs to be fixed after shipment. NAND flash memory devices are adopted in such devices in order to reduce the cost. The program code in a NAND flash memory is loaded to RAM using demand paging technologies. In many cases, compressed program code is stored in the NAND flash memory and loaded by extracting the program code because the loading time for the uncompressed code is larger than the total time for loading and extracting the compressed code with some compression algorithms. Byte-Pair-Encoding (BPE) is a suitable algorithm for this purpose. The compression rate for BPE is slightly less than GZIP and the extraction speed is very fast. However, the compression speed is very slow. Software updating functions require the compression of program code on a device and have to compress quickly. This paper discusses the software update functions employed for such embedded devices, and proposes a BPE compression speed acceleration technique for software updating. The results obtained from an evaluation show that the proposed method is effective in compressing program code.

关键词： Acceleration Mobile handsets Embedded software Random access memory Large-scale systems Software debugging Computer bugs Costs Read-write memory compression algorithms

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Segment-Parallel Predictor for FPGA-Based Hardware Compressor and Decompressor of Floating-Point Data Streams to Enhance Memory I/O Bandwidth

Segment-Parallel Predictor for FPGA-Based Hardware Compresso...

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Data compression Conference (DCC)

作者： Kentaro Sano Kazuya Katahira Satoru Yamamoto Graduate School of Information Sciences University of Tohoku Sendai Japan

ISBN: (纸本)9781424464258;9780769539942

This paper presents segment-parallel prediction for high-throughput compression and decompression of floating-point data streams on an FPGA-based LBM accelerator. In order to enhance the actual memory I/O bandwidth of the accelerator, we focus on the prediction-based compression of floating-point data streams. Although hardware implementation is essential to high-throughput compression, the feedback loop in the decompressor is a bottleneck due to sequential predictions necessary for bit reconstruction. We introduce a segment-parallel approach to the 1D polynomial predictor to achieve the required throughput for decompression. We evaluate the compression ratio of the segment-parallel cubic prediction with various encoders of prediction difference.

关键词： Hardware Bandwidth Arithmetic Field programmable gate arrays Throughput Computational fluid dynamics Concurrent computing Parallel processing compression algorithms Feedback loop

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