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检索条件"主题词=Fast algorithm"

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EFFECTIVE HEVC INTRA CODING UNIT SIZE DECISION BASED ON ONLINE PROGRESSIVE BAYESIAN CLASSIFICATION

EFFECTIVE HEVC INTRA CODING UNIT SIZE DECISION BASED ON ONLI...

引用

IEEE International Conference on Multimedia & Expo (ICME)

作者： Chen, Jiawei Yu, Lu Zhejiang Univ Inst Informat & Commun Engn Zhejiang Prov Key Lab Informat Proc Commun & Netw Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9781467372589

In High Efficiency Video Coding (HEVC), optimal coding unit (CU) size is decided based on recursive rate-distortion cost comparison, which consumes high computational resources. In this paper, an effective HEVC intra CU size decision algorithm is proposed to speed up the encoding process. The algorithm is based on progressive Bayesian classification, which is composed of two cascade classifiers: a three-class classifier and a binary classifier, at every coding depth. The three-class classifier firstly partitions the feature space into three regions: split, indistinct and non-split regions. Then, the binary classifier further partitions the indistinct region into split and non-split regions by utilizing additional complicated features. The thresholds of the two classifiers are well designed based on Bayesian risk to balance coding efficiency and complexity. All classifiers are online trained and experimental results show that the proposed algorithm can save approximately 51%similar to 63% of the total encoding time of HM 15.0 with negligible loss on rate-distortion performance.

关键词： Intra coding fast algorithm progressive classification Bayesian classification HEVC

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A fast DIRECTION-OF-ARRIVAL ESTIMATION BASED ON THE FRACTIONAL LOWER ORDER CYCLIC CORRELATION

A FAST DIRECTION-OF-ARRIVAL ESTIMATION BASED ON THE FRACTION...

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2010 International Conference on Advanced Intelligence and Awareness Internet(2010年高等智能与感知网络国际大会 AIAI 2010)

作者： Xiaoou Zhao Li Li Xiaojun Jing School of Telecommunication and Information Systems Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781849192064

A new algorithm for Direction-of-Arrival (DOA) estimation is presented in α -stable distribution noise environment. Since the DOA estimation algorithms based on the second order cyclic stationary correlation degrade seriously in nonGaussian noise environment and need a large amount of calculation, this new algorithm based on fractional lower order statistics can get the accurate DOA estimation in impulsive noise environment and also it is fast because it avoids searching the spatial spectrum. Simulation results show the effectiveness of the algorithm.

关键词： wireless location non-Gaussian signal array signal processing Direction-of-Arrival estimation fast algorithm

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fast COMPUTATION OF R-DIMENSIONAL DHT WITH SIZE QL1×QL2×…×QLR

FAST COMPUTATION OF R-DIMENSIONAL DHT WITH SIZE QL1×QL2×…...

引用

2000年第16届世界计算机大会

作者： Yonghong Zeng Guoan Bi Alex C.Kot School of EEE Nanyang Technological University National University of Defense Technology

fast algorithms are presented for multi-dimensional discrete Hartley transform(MD-DHT) with size q×q×…×q,where q is an odd prime number,and r > 1 is the number of *** using the multidimensional polynomial transform,the MD-DHT can be converted into a series of reduced one-dimensional *** to other fast algorithms,the proposed one substantially reduces the overall computational complexity and has a simple computational structure.

关键词： fast algorithm Discrete Transform Multidimensional Signal Processing

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Hydroelastic calculations of viscous flow around a cylinder-spring system

Hydroelastic calculations of viscous flow around a cylinder-...

引用

10th International Offshore and Polar Engineering Conference (ISOPE-2000)

作者： Yu, ZX Liu, YZ Shanghai Jiao Tong Univ Shanghai 200030 Peoples R China

ISBN: (纸本)1880653478

Cylinder is a typical component of offshore structures acted by various fluid forces, especially by viscous forces that may cause damage to structures due to vortex-induced vibrations. In this paper, the hydroelastic response of a circular cylinder-spring system to viscous flow is studied by numerical analysis. The method uses contravariant velocity fluxes on staggered grid and second-order finite volume project discretization with GMRES/ILU technique to speed up the calculations. The motion of the cylinder integrated bg Newmark-beta method is coupled with fluid flow calculation by ALE technique. The characteristic parameters of the vortex street such as Strouhal number and force coefficients can be predicted successfully. The 'beat' and 'lock-in' phenomena of the coupled system are revealed in the present calculations which agree well with existing experiment results. These calculations are instructive to further understanding of the hydroelastic dynamics of viscous flow.

关键词： hydroelasticity NS solver vortex-induced vibration fast algorithm

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Approximate analytical expression for the spectrum of polychromatic Gaussian beams passing through a multi-apertured ABCD optical system

Approximate analytical expression for the spectrum of polych...

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International Symposium on Photoelectronic Detection and Imaging 2011 - Laser Sensing and Imaging and Biological and Medical Applications of Photonics Sensing and Imaging

作者： Zhao Guang-pu Huang Ping Yibin Univ Computat Phys Key Lab Higher Educ Sichuan Prov Yibin 644000 Sichuan Peoples R China

ISBN: (纸本)9780819488336

The calculation for the spectrum of beams passing through a multi-apertured ABCD optical system has not been finished in any personal computer when the aperture number is more than a certain value. By means of the expansion of the window function of the hard-edge aperture into a finite sum of complex Gaussian functions, an approximate analytical expression for the spectrum of polychromatic Gaussian beams passing through a multi-apertured ABCD optical system is derived and illustrated with numerical examples. The numerical results find an agreement with those by straightforward integral of the cross-spectral density function, but the computing time is strongly reduced.

关键词： Laser optics fast algorithm multi-apertured ABCD optical system spectrum

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Multidimensional Polynomial Transform algorithm For Multidimensional Discrete W Transform

Multidimensional Polynomial Transform Algorithm For Multidim...

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1996 3rd International Conference on Signal Processing(ICSP’96)

作者： Zeng Yonghong Li Xiaomei 7th Department National University of Defense Technology 6th Department National University of Defense Technology

ISBN: (纸本)0780329120

In this paper,the Multidimensional Polynomial Transform is used to convert the Multidimensional W Transform(MDDWT) into a series of one-dimensional VV transform(DWT).Thus,a new polynomial transform algorithms for MDDWT is obtained. The algorithm needs no complex number operations and is simple in *** number of multiplications for computing a r-d DWT is only 1/r times that of the common used row-column *** number of additions is also reduced considerablely.

关键词： fast algorithm Discrete Transform Multidimensional Signal Processing

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Improved Affinity Propagation Clustering for Business Districts Mining 30

Improved Affinity Propagation Clustering for Business Distri...

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30th IEEE International Conference on Tools with Artificial Intelligence (ICTAI)

作者： Chen, Zhi Xu, Jian Wu, Yang Zheng, Ning Tu, Liming Luo, Ming Hangzhou DianZi Univ Comp Sci & Technol Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781538674499

Business districts serve as basic structures for understanding the organization of real-world economic network. Discovering these business districts in cities establish new types of valuable applications that can benefit end users: Business investors can better identify the proximity of existing business districts and hence, can contribute a better future planning for investing. In this paper, we propose improved affinity propagation clustering for business districts mining. Given check-in data, whose geography information represents business venues' location, we introduce a affinity propagation clustering algorithm(AP), a basic solution, to cluster venues. This strategy requires that real-valued messages are exchanged among business venues until a set of centers and corresponding business districts gradually emerges. However, the computational complexity of AP is affected by the scale of input. And it's not adaptive for random distribution of venues when mining business districts. To conduct business districts mining efficiently, we introduce a pruning method, termed as PAP. And then present merging based mine approach, termed as MAP. We conduct experiments from Yelp data, and experimental results show that our proposed method outperforms the basic solutions and resolves the problem well.

关键词： Business district Affinity propagation fast algorithm Exemplar-based clustering PAP MAP

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A fast Motion and Strain Estimation Method

A Fast Motion and Strain Estimation Method

引用

2010 IEEE International Ultrasonics Symposium

作者： Jianwen Luo Elisa E. Konofagou Departments of Biomedical Engineering Columbia University New York NY USA

ISBN: (纸本)9781457703829

We have previously developed a sum-table method for fast motion estimation with different motion estimators such as normalized cross-correlation (NCC), sum of square differences (SSD), sum of absolute differences (SAD). In this paper, more details of the sum table methods for different motion estimators were provided. The computational time of different motion estimators was compared in both 1D and 2D cases. A fast method of strain calculation was also described. The sum-table method was further implemented in a clinical ultrasound system to image the pulse wave in the aorta in real time.

关键词： fast algorithm motion strain sum table motion estimation pulse wave Estimators computational time sums fasting Aorta

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CORDIC-based fast radix-2 DST algorithms

CORDIC-based fast radix-2 DST algorithms

引用

International Conference on Software Intelligence Technologies and Applications & International Conference on Frontiers of Internet of Things 2014

作者： Hai Huang Bo Wu Weidong Wang Tianyang Gao School of software Harbin University of Science and Technology China School of Automation Harbin University of Science and Technology China Beijing Shenwu Environment & Energy Technology Co. Ltd. Harbin China Hei Longjiang Research Institute of Electric Power Exploration and Design Harbin China

This paper proposes a novel coordinate rotation digital computer (CORDIC)-based fast radix-2 algorithm for computation of the discrete sine transforms (DST). The proposed algorithms can generate the next higher order transforms from lower order transforms and have some distinct advantages, such as regular and purely feed forward data path, in place computation, unique post-scaling factor and arithmetic-sequence CORDIC rotation angles. Compared to existing algorithms, these proposed algorithms not only have lower arithmetic complexity, but also admit efficient pipelined VLSI implementation. In addition, an easy way to obtain the fast inverse DST by using the orthogonal property is presented.

关键词： CORDIC DST VLSI fast algorithm Drill stem testing water sink Dystonin Digital arithmetic Very large scale integration channels (data transmission) algorithms Transform

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fast harmonic chirp summation

Fast harmonic chirp summation

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Jesper Kjaer Nielsen Tobias Lindstrom Jensen Jesper Rindom Jensen Mads Graesboll Christensen Soren Holdt Jensen Audio Analysis Lab AD:MT Aalborg University Denmark Dept. of Electronic Systems Aalborg University Denmark

ISBN: (纸本)9781509041183

The harmonic chirp signal model has only very recently been introduced for modelling approximately periodic signals with a time-varying fundamental frequency. A number of estimators for the parameters of this model have already been proposed, but they are either inaccurate, non-robust to noise, or very computationally intensive. In this paper, we propose a fast algorithm for the harmonic chirp summation method which has been demonstrated in the literature to be accurate and robust to noise. The proposed algorithm is orders of magnitudes faster than previous algorithms which is also demonstrated via timing studies.

关键词： Harmonic chirp model harmonic chirp summation fast algorithm

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