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检索条件"主题词=Quadratic Programming"

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Quantization Adjusting Algorithm Using Difference Rate Value

Quantization Adjusting Algorithm Using Difference Rate Value

引用

9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP'08)

作者： Yan Huo Tao Jing Yu Zhang Renfei Niu School of Electronics and Information Engineering Beijing Jiaotong University

This paper presents a quantization parameter (QP) adjusting *** this work,final QP can be obtained by difference value of rate and *** order to obtain the adjusted quantization,the method adopts quadratic relationship between △R and △Q,and uses the iteration *** adjusting process can be used in adaptive quantization algorithm in video compression coding such as MPEG *** results demonstrate that this algorithm can adjust QP automatically and obtain the better performance in PSNR.

关键词： Quantization Video compression quadratic programming Rate-distortion Code standards IP networks Wireless networks Bit rate Rate distortion theory MPEG standards

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Cycle-transitivity is all around

Cycle-transitivity is all around

引用

Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Bernard De Baets Hans De Meyer Department of Applied Mathematics Biometrics and Process Control Ghent University Ghent Belgium

In this paper, the transitivity properties of reciprocal relations, also called probabilistic relations, are investigated within the framework of cycle-transitivity, which generalizes the concepts of T-transitivity, stemming from fuzzy set theory, and of stochastic transitivity, common to many mathematical models in psychology, social choice and welfare, financial mathematics, etc. It is emphasized that this unifying framework is tailor-made for characterizing the transitivity of reciprocal relations that originate from the comparison of random variables. Interesting types of transitivity are highlighted and shown to be realizable in applications. For example, given a collection of random variables (X k ) kisin1 , pairwisely coupled by means of a same copula C isin {T M ,Tp,T L }, the transitivity of the reciprocal relation Q defined by Q(X i ,X j ) = Prob{X i > X j } + 1/2 Prob{X i = X j } can be characterized within the cycle-transitivity framework. Similarly, given a poset (P, 1,..., x n }, the transitivity of the mutual rank probability relation Qp, where Qp(X i ,X j ) denotes the probability that X i precedes x j in a random linear extension of P, is characterized as a type of cycle-transitivity for which no realization had been found so far.

关键词： Random variables Mathematics Stochastic processes Fuzzy set theory Psychology quadratic programming Biometrics Process control Computer science Upper bound

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H.264 Frame Layer Rate Control Based on Block Histogram Difference

H.264 Frame Layer Rate Control Based on Block Histogram Diff...

引用

IEEE International Conference on Communications Workshops, ICC

作者： T. Lan X. Gu Communication Research Center Harbin Institute of Technology Harbin China

A novel H.264 frame layer bit allocation scheme based on block histogram difference (BH) is proposed. First, the sufficiency of channel bandwidth is considered at the beginning of each scene. Then, the target bits for each frame are weighted by the relative complexity measurement based on BH. Experimental results show proposed algorithm can adapt to different relationships between channel bandwidth and encoding complexity of video sequence, and achieves better trade-off between channel bandwidth and compressed video quality.

关键词： Histograms Bit rate Bandwidth Video sequences Communication system control Layout Video compression quadratic programming Communications Society Conferences

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Efficient Filtering Using Monotonic Walk Model

Efficient Filtering Using Monotonic Walk Model

引用

2008 American Control Conference (ACC), vol.7

作者： Dimitry Gorinevsky Information Systems Laboratory Department of Electrical Engineering University of Stanford Stanford CA USA

This paper proposes a nonlinear filter for estimating monotonic underlying trend from noisy observations. The filter computes Maximum A posteriori Probability (MAP) estimate using a monotonic walk model instead of the random walk model in standard linear filtering. The batch estimate is a solution of quadratic programming (QP) problem. This paper shows that the QP has a form of isotonic regression (IR) and has a linear computational complexity. The filter is implemented in a Moving Horizon Estimation (MHE) setting. The data beyond the estimation horizon are replaced by the initial condition parameters (arrival cost). The MHE for IR is nonsmooth, so the existing nonlinear MHE theory is not applicable. By exploiting properties of the IR solution, we develop an update of the MHE arrival cost, which is provably close to the full information MAP solution and stable. The analysis is complemented by a Monte Carlo simulation study of the proposed nonlinear filtering algorithm. The simulation results confirm improved performance of the proposed filter compared with a linear filter and the earlier version of the MHE update.

关键词： Nonlinear filters quadratic programming Costs Signal processing Filtering algorithms Delay estimation Maximum likelihood detection Computational complexity Algorithm design and analysis Steady-state

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Efficient Selection of Candidates for Fast Inter Mode Decision in H.264

Efficient Selection of Candidates for Fast Inter Mode Decisi...

引用

International Conference on Future Generation Communication and Networking Symposia, FGCNS

作者： Woo-Seok Jang Jin Heo Yo-Sung Ho Gwangju Institute of Science and Technology South Korea

In the H.264/AVC video codec, a rate-distortion optimization method for mode decision provides high coding efficiency. However, it increases encoding time significantly due to its high complexity. In this paper, we propose a fast algorithm for inter mode decision using motion cost during motion estimation to reduce the number of candidate modes. The proposed approach makes early 16 times 16 mode decision and early inactive P8 times 8 mode decision. Its encoding performance is similar to that of the fast inter mode decision in the H.264/AVC JM reference software; however, its encoding time is reduced by 30.95% on average. Especially, when quantization parameter (QP) is larger, we obtained better results.

关键词： Encoding Automatic voltage control Video codecs Rate-distortion Optimization methods Costs Motion estimation Software performance Quantization quadratic programming

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Design of H-plane waveguide cruciform hybrid using dielectric posts

Design of H-plane waveguide cruciform hybrid using dielectri...

引用

Asia-Pacific Conference on Microwave

作者： Mitsuyoshi Kishihara Isao Ohta Tadashi Kawai Kensuke Okubo Jiro Yamakita Department of Communication Engineering Okayama Prefectural University Japan University of Hyogo Japan

A compact H-plane waveguide cruciform coupler using metallic posts has recently been proposed. It consists of two rectangular waveguides crossing each other at right-angles, two metallic posts arranged on a diagonal line of the cross region for producing directional properties, and one metallic post inserted for matching at each waveguide port. Generally, it is known that any lossless reciprocal 4-port circuit with two-fold symmetry can constitute 90-degree directional coupler, if the four ports are completely matched. In this work, a design of the cruciform hybrid coupler using dielectric posts instead of metallic posts is attempted [3]. The analysis and the design are performed based on the H-plane planar circuit approach for short-circuited boundary segments with the use of the segmentation method. It is shown that good frequency characteristics with fractional bandwidths of about 10% can be realized for the X-band waveguides. The validity of the design results is confirmed by an EM-simulator (Ansoft HFSS) and an experiment.

关键词： Dielectrics quadratic programming Rectangular waveguides Coupling circuits Permittivity Impedance Transmission line matrix methods Performance analysis Matrices Shape

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An Improved Rate Control for Video Communication of H.264 Standard

An Improved Rate Control for Video Communication of H.264 St...

引用

Congress on Image and Signal Processing, CISP

作者： Chou-Chen Wang Tse-Fan Yeh Cheng-Wei Yu Department of Electronic Engineering I Shou University Kaohsiung Taiwan

In this paper, we propose an improved rate control scheme for low delay H.264 video coding. A fast and best selection of initial QP is first proposed in the GOP layer rate control. Then, an improved MAD prediction model and overhead bits prediction method is adopted in the MB layer rate control. The simulation results show that the proposed scheme gives an average PSNRY gain of about 0.55 dB when compared with *** addition, the proposed scheme improves the number of frame skipped and reduces the quality deviations of the initial frames by choosing the best initial QP.

关键词： Communication system control Communication standards quadratic programming Video coding Bit rate Delay Automatic voltage control Quantization Streaming media Video signal processing

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Cluster Reduction Support Vector Machine for Large-Scale Data Set Classification

Cluster Reduction Support Vector Machine for Large-Scale Dat...

引用

Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA

作者： Guangxi Chen Yan Cheng Jian Xu School of Mathematics & Computing Science Guilin University of Electronic and Technology Guilin China School of Statistics & Applied Mathematics Anhui University of Finance and Economics BengBu China

Support vector machine (SVM) has been a promising method for data mining and machine learning in recent years. However, the training complexity of SVM is highly dependent on the size of a data set. A cluster support vector machines (C-SVM) method for large-scale data set classification is presented to accelerate the training speed. By calculating cluster mirror radius ratio and representative sample selection in each cluster, the original training data set can be reduced remarkably without losing the classification information. The new method can provide an SVM with high quality samples in lower time consuming. Experiments with random data and UCI databases show that the C-SVM retains the high quality of training data set and the classification accuracy in data mining.

关键词： Support vector machines Support vector machine classification Large-scale systems Training data quadratic programming Data mining Kernel Mathematics Machine learning Conferences

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Adaptive Rate Control in Frame-layer for Real-time H.264/AVC

Adaptive Rate Control in Frame-layer for Real-time H.264/AVC

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Myoung-Jin Kim Kyoung-Hwan Kim Min-Cheol Hong School of Electronic Engineering Soongsil University Seoul South Korea

Rate control is a critical issue in H.264/AVC video coding standard. The purpose of this paper is to improve allocation of the number of bits without skipping the frame by accurately estimating the target bits in H.264/AVC rate control. In our scheme, we propose an enhancement to the target frame rate based H.264/AVC bit allocation method. The enhancement is by using a frame complexity estimation to improve the existing mean absolute difference (MAD) based complexity measure. Bit allocation to each frame is not just computed by target frame rate but also adjusted by a combined frame complexity measure. To prevent an undesirable buffer overflow or underflow in short of channel bandwidth, the computed quantization parameter (QP) for the current frame is adjusted based on actual encoding results at that point. The objective of QP and adjustment is to produce bits as close to the target frame as possible, which is especially important for low bandwidth based real-time applications. Simulation results show that the H.264 encoder, using our proposed rate control scheme, obtains significant improvement for the mismatch ratio of target bits and actual bits, achieves a 0.17 dB average PSNR improvement, achieves a similar or smaller PSNR deviation, and achieves time saving of 71 % when compared to the JM 12.1 rate control algorithm.

关键词： Programmable control Adaptive control Automatic voltage control Bit rate Bandwidth quadratic programming PSNR Video coding Buffer overflow Quantization

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Study of an Improved Online Least Squares Support Vector Machine Algorithm and Its Application in Gas Prediction

Study of an Improved Online Least Squares Support Vector Mac...

引用

International Conference on Natural Computation (ICNC)

作者： Xiao-hu Zhao Ke-ke Zhao School of Communication & Electronic Engineering China University of Mining and Technology China

The paper studied on gas prediction problem. According to traditional prediction methods on coal mine safety being offline without dynamic prediction function and the shortcomings in the traditional online learning with least squares support vector machine (LS-SVM), this paper gave an improved online prediction algorithm of LS-SVM. This algorithm was used in gas prediction of some coal mine. By comparing with the actual data and other relative algorithms, the paper proved effect of the algorithm.

关键词： Least squares methods Support vector machines Geology Prediction methods Predictive models Equations quadratic programming Neural networks Paper technology Safety

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