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检索条件"主题词=compression algorithms"

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XML compression improvements based on the clustering of elements

XML compression improvements based on the clustering of elem...

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Computer Information Systems and Industrial Management Applications (CISIM)

作者： Pavel Hruška Jan Martinovič Jiří Dvorský Václav Snášel Department of Computer Science VšB Technical University of Ostrava Ostrava Czech Republic

This paper focuses on improvement of compression of XML documents based on clustering and rearranging of XML elements within XML documents. Such transformed XML documents can be efficiently compressed.

关键词： XML Clustering algorithms Databases Data structures Data compression Computers compression algorithms

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Sub-sampling Elemental Images for Integral Imaging compression

Sub-sampling Elemental Images for Integral Imaging Compressi...

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2010 International Conference on Audio,Language and Image Processing(2010年音频、语言与图像处理国际会议 ICALIP 2010)

作者： Yan Piao Xiaoyuan Yan College of Electronic Information Engineering Chang Chun University of Science and Technology Chan College of Electronic Information Engineering Chang Chun University of Science and Technology Chan

ISBN: (纸本)9781424458653

The large amount of image data from the captured 3D integral image requires to be presented with adequate resolution. It is therefore necessary to develop compression algorithms that take advantage of the characteristics of the recorded integral image. In this paper we propose a new compression method that is adapted to integral imaging. According to the optical characteristics of integral imaging, most of the information of each elemental image is overlapped with that of its adjacent elemental images. Thus, the method is to achieve image compression by taking a sample from the elemental image sequence for every m elemental images to get image compression. Experimental results that are presented to illustrate the proposed compression technique prove that the proposed technique can improve the compression ratio of integral imaging.

关键词： integration Image compression Data compression image data images compression ratio compression algorithms Imaging image sequences Imagery (Psychotherapy) Image compression

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JPEG image compression algorithm analysis and local optimization

JPEG image compression algorithm analysis and local optimiza...

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IEEE International Conference on Advanced Management Science (ICAMS)

作者： Xing Wang Xinhuan Feng Nianfeng He Qilong Jia Ying Zou School of Computer Sichuan University Chengdu China School of Computer Chengdu China School of Architecture and Environment Sichuan University Chengdu China School of Architecture and Environment Chengdu China School of Manufacturing Science and Engineering Sichuan University Chengdu China

The purpose of this paper is to analyze and further optimize the JPEG image compression algorithm. First we analysis of JPEG image compression algorithm to achieve the specific methods with the advantages and disadvantages, at the same time, in the algorithm module in the sending, the output of a new data transfer mode was developed to reduce the error rate and enhance perform well in the data transfer rate based on the algorithm local optimization. In the end, we proved that the new data transfer mode can efficiently improve the data transfer rate and reduce the error rate through an experiment.

关键词： compression algorithms Algorithm design and analysis Educational institutions Transform coding Huffman coding

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An Lidar data compression method based on improved LZW and Huffman algorithm

An Lidar data compression method based on improved LZW and H...

引用

International Conference on Electronics And Information Engineering (ICEIE)

作者： YiKun Zhang Xiao Li DengXin Hua Hao Chen HaiYan Jin Xi'an University of Technology Xi'an China

Lidar raw echo data has characteristics such as huge data quantity, strong discreteness and unpredictability. According to the construction of Lidar monitoring network of atmospheric environment, the existing network can not provide enough bandwidth to transmit Lidar data in real time. In this paper, we propose a novel hybrid lossless compression algorithm to reduce the transmission amount, namely the probability statistics lossless compression algorithm base on the improved LZW(Lempel-Ziv-Welch), which combines Huffman coding. With experiment on the raw two-value atmospheric data, we verify the effectiveness of our approach that the compression ratio is close to 9.5:1 and the coding efficiency is up to 98%.

关键词： Algorithm design and analysis Laser radar compression algorithms Data compression Dictionaries Image coding Monitoring

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A new quad-tree segmented image compression scheme using histogram analysis and pattern matching

A new quad-tree segmented image compression scheme using his...

引用

International Conference on Computer and Automation Engineering, ICCAE

作者： Farhad Keissarian University of Wollongong UAE

ISBN: (纸本)9781424455690

In this paper, a new variable block-size image compression scheme is presented. A quadtree segmentation is employed to generate blocks of variable size according to their visual activity. Inactive blocks are coded by the block mean, while active blocks are coded by the proposed matching algorithm using a set of parameters associated with the pattern appearing inside the block. Both the segmentation and the pattern matching are carried out through histogram analysis of block residuals. The use of pattern parameters at the receiver together with the quadtree code reduces the cost of reconstruction significantly and exploits the efficiency of the proposed technique.

关键词： Image segmentation Image coding Histograms Image analysis Pattern analysis Pattern matching Costs Image reconstruction Image resolution compression algorithms

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On power and performance tradeoff of L2 cache compression

On power and performance tradeoff of L2 cache compression

引用

Norchip

作者： Chandrika Jena Tim Mason Tom Chen Department of ECE Colorado State University Fort Collins CO USA

This paper presents the power-performance trade off of three different cache compression algorithms. Cache compression improves performance, since the compressed data increases the effective cache capacity by reducing the cache misses. The unused memory cells can be put into sleep mode to save static power. The increased performance and saved power due to cache compression must be more than the delay and power consumption added due to CODEC(COmpressor and DECompressor) block respectively. Among the studied algorithms, power-delay characteristic of Frequent Pattern compression(FPC) is found to be the most suitable for cache compression.

关键词： Delay Codecs Decoding Encoding Transistors compression algorithms Shift registers

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Analytical Motion Blur Rasterization with compression 10

Analytical Motion Blur Rasterization with Compression

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Conference on High-performance Graphics

作者： Carl Johan Gribel Michael Doggett Tomas Akenine-Moller Lund University Lund University Intel Corporation

ISBN: (纸本)9781617827242

We present a rasterizer, based on time-dependent edge equations, that computes analytical visibility in order to render accurate motion blur. The theory for doing the computations in a rasterization framework is derived in detail, and then implemented. To keep the frame buffer requirements low, we also present a new oracle-based compression algorithm for the time intervals. Our results are promising in that high quality motion blurred scenes can be rendered using a rasterizer with rather low memory requirements. Our resulting images contain motion blur for both opaque and transparent objects.

关键词： motion blur Raster processing memory requirements compression algorithms Time intervals increased density compression frame buffer

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A bandwidth-efficient embedded compression algorithm using two-level rate control scheme for video coding system

A bandwidth-efficient embedded compression algorithm using t...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Yu-Hsuan Lee Yi-Cheng Chen Tsung-Han Tsai DSP/VLSI Laboratory Department of Electronics Engineering National Central University Taoyuan Taiwan

In modern video coding system, the memory bandwidth of external memory becomes more and more important and almost dominates the system performance. To save the memory bandwidth, the embedded compression (EC) technique is integrated into video coding system. In this paper, the bandwidth-efficient EC algorithm is proposed. It comprises three core techniques: side-oriented prediction, adjusted binary code (ABC) entropy coding, and two-level rate control scheme. The side-oriented prediction can save the extra bits for the representation of prediction residual. The prediction residual is allocated to an efficient codeword by ABC entropy coding. With two-level rate control scheme, not only the compression ratio (CR) can be precisely controlled, but also the visual quality is maintained. Experiment results show this work achieves the PSNR drop of 1.33%, and the error between CR and Target CR (TCR) is as minor as 1.60%. Consequently, this work is quite suitable for saving memory bandwidth in video coding system.

关键词： compression algorithms Control systems Video coding Bandwidth Entropy coding Chromium CMOS technology System performance Binary codes High definition video

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Texture compression of Light Maps using Smooth Profile Functions 10

Texture Compression of Light Maps using Smooth Profile Funct...

引用

Conference on High-performance Graphics

作者： Jim Rasmusson Jacob Strom Per Wennersten Michael Doggett Tomas Akenine-Moeller Ericsson Research Lund University

ISBN: (纸本)9781617827242

Light maps have long been a popular technique for visually rich real-time rendering in games. They typically contain smooth color gradients which current low bit rate texture compression techniques, such as DXT1 and ETC2, do not handle well. The application writer must therefore choose between doubling the bit rate by choosing a codec such as BC7, or accept the compression artifacts, neither of which is desirable. The situation is aggravated by the recent popularity of radiosity normal maps, where three light maps plus a normal map are used for each surface. We present a new texture compression algorithm targeting smoothly varying textures, such as the light maps used in radiosity normal mapping. On high-resolution light map data from real games, the proposed method shows quality improvements of 0. 7 dB in PSNR over ETC2, and 2.8 dB over DXT], for the same bit rate. As a side effect, our codec can also compress many standard images (not light maps) with better quality than DXT1/ETC2.

关键词： maps light figure codecs compression ARTIFACTS color gradients compression algorithms Side Effect Quality Improvement Radiosity texture

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A Loss-less compression Technique for High Quality Speech Signals and its Implementation with MPEG-4 ALS for Better compression

A Loss-less Compression Technique for High Quality Speech Si...

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2010 IEEE International Conference on Information Theory and Information Security(2010 IEEE 国际信息论与信息安全会议)

作者： Syed Bahauddin Alam Md.Abdul Matin Hussain Mohammed Dipu Kabir Imranul Kabir Chowdhury Bangladesh University of Engineering & Technology Dhaka American International University Bangladesh Dhaka

This paper presents a theory of lossless digital compression. Quality of voice signal is not important for voice communication. In hearing music high quality music is always recommended. For this emphasis is given on the quality of speech signal. To save more music it is needed to save them consuming smaller memory space. In proposed compression 8-bit PCM/PCM speech signal is compressed. When values of samples are varying they are kept same. When they are not varying the number of samples containing same value is saved. After compression the signal is also an 8-bit PCM/PCM. MPEG-4 ALS is applied in this compressed PCM signal for better compression.

关键词： Speech Transform coding Phase change materials Speech coding compression algorithms Algorithm design and analysis

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