共查询到20条相似文献，搜索用时 46 毫秒
1.
The rate and distortion of Id-slice do not fit the globally linear relationship on a logarithmic scale. Lagrange multiplier selection methods based on the globally linear approximate relationship are neither efficient nor optimal for multi-view video coding (MVC). To improve the coding efficiency of MVC, a local curve fitting based Lagrange multiplier selection method is proposed in this paper, where Lagrange multipliers are selected according to the local slopes of the approximate curves. Experimental results showed that the proposed method improves the coding efficiency. Up to 2.5 dB gain was achieved at low bitrates. 相似文献
2.
A novel color compensation method for multi-view video coding （MVC） is proposed, which efficiently exploits the inter-view dependencies between views with the existence of color mismatch caused by the diversity of cameras. A color compensation model is developed in RGB channels and then extended to YCbCr channels for practical use. A modified inter-view reference picture is constructed based on the color compensation model, which is more similar to the coding picture than the original inter-view reference picture. Moreover, the color compensation factors can be derived in both encoder and decoder, therefore no additional data need to be transmitted to the decoder. The experimental results show that the proposed method improves the coding efficiency of M VC and maintains good subjective quality. 相似文献
3.
不同的多视点视频序列具有不同的时空相关性,MVC采用的分层B帧预测结构无法充分利用视频序列的属性。本文提出了一种能适应不同视频序列编码的方法,通过研究多视点视频图像中的时空相关性和视点间的相关性,适当地取消部分时间层的视点间预测并且对所有P视点的非关键帧均采用视点间预测和调整了I视点的位置。实验结果表明,本文方法在提高编码效率的同时使得预测结构具有更好的随机访问性能、更低的编码复杂度。 相似文献
4.
对一般线性比式和问题(P)提出了一种全局优化算法,此方法利用拉格朗日对偶中的弱对偶定理建立原问题(P)的线性松弛规划,运用分枝定界方法只需解一系列线性问题。从理论上证明了算法能收敛到线性比式和问题的全局最优解。数值计算结果表明提出的方法是可行的。 相似文献
5.
何吉欢 《上海大学学报(英文版)》1997,(1)
lintroductionIn1954,byso-calledtry-and-el.l.ormethodHull]deducedtheHu-Washizupl'inciple,whichplaysan.importantroleinthehistoryofvariation.In1964,ChienlZIsystematicallydiscussedtheLagrangemultipliermethod.Withthemethod,hesuccessfullydeducedHu-Washizuprinci… 相似文献
6.
Jihuan He Ph. D. 《上海大学学报(英文版)》1997,1(1):36-41
The paper has proved that Hellinger-Reissner and Hu-Washizu variational principles are but equivalent principles in elasticity
by following three ways: 1) Lagrange multiplier method. The paper points out that only a new independent variable can be introduced
when one constraint equation has been eliminated by one Lagrange multiplier, which must be expressed as a function of the
original variable(s) and/or the new introduced variable after identification. In using Lagrange multiplier method to deduce
Hu-Washizu principle from the minimum potential energy principle, which has only one kind of independent variable namely displacement,
by eliminating the constraint equations of stress-displacement relations, one can only obtain a principle with two kinds of
variables namely displacement and stress; 2) involutory transformation, with such method Hu-Washizu variational principle
can be deduce directly from the Hellinger-Reissner variational principle under the same variational constraints of stress-strain
relation, and vice verse; 3)semi-inverse method, by which both of the above variational principles can be deduced from the
minimum potential energy principle with the same variational constraints. So the three kinds of variational functions in Hu-Washizu
variational principle are not independent to each other, the stress-strain relationships are still its constraint conditions. 相似文献
7.
Modified Lagrange Multiplier Method and Generalized Variational Principle in Fluid Mechanics 总被引：2，自引：0，他引：2
何吉欢 《上海大学学报(英文版)》1997,1(2):117-122
lintroductionTheLagrangemultipliermethodplaysanimportantrole.notonlyinfluidmechanicsbutalsoinelasticity,inestablishingageneralizedvariationalprinciple(GVP),whichprovidesaverybroadandversatiletheoreticaltooltbrnumericalsimulationinfluidmechanics,especially… 相似文献
8.
9.
Variable size motion estimation (ME) and disparity estimation (DE) are employed to select the best coding mode for each macroblock (MB) in the current joint multiview video model (JMVM).This technique achieves the highest possible coding efficiency,but it results in extremely large computation complexity which obstructs the multiview video coding (MVC) from practical application.This paper proposes an adaptive early termination of fast mode decision algorithm for MVC.It makes use of the coding information o... 相似文献
10.
Current multi-view video coding （MVC） reference model in joint video team （JVT） does not provide efficient rate control schemes. This paper presents a rate control algorithm for MVC by improving the quadratic rate-distortion （R-D） model. We reasonably allocate bit-rate among views based on the correlation analysisl The proposed algorithm consists of three levels to control the rate bits more accurately, of which the frame layer allocates bits according to the frame complexity and the temporal activity. Extensive experiments show that the proposed algorithm can control the bit rate efficiently. 相似文献
11.
何毅 《四川三峡学院学报》2013,(3):29-32
给出不同的具有不等式约束的F线性优化问题的最优解集的刻画.结果用梯度条件和拉格朗日乘子表示.首先我们建立了F线性优化问题的拉格朗日函数在最优解集中是常值函数.然后,利用该性质得到了一些拉格朗日乘子为基础的最优解集的刻画. 相似文献
12.
多元函数的条件极值有多种算法。该文以举例的方式,总结介绍多元函数条件极值的几种初等计算方法及拉格朗日乘数法。 相似文献
13.
杨余飞 《中山大学学报论丛》1996,(5)
本文关于求解椭圆型偏微分方程右端项提出了一种混合方法，即结合“输出最小二乘法”与“方程误差法”，将原问题化为约束优化问题，再利用增广Ｌａｇｒａｎｇｅ泛函方法将所导出的优化问题化为无约束优化问题，并给出了解与Ｌａｇｒａｎｇｅ乘子的估计式 相似文献
14.
袁秀萍 《四川职业技术学院学报》2003,13(4):106-107
拉格朗日乘数法给出了多元函数条件极值的必要条件，本利用正定二次型理论证明多元函数条件极值的一个充分条件．并应用它求解多元函数条件极值问题． 相似文献
15.
Samuel B. Green Marilyn S. Thompson Jennifer Poirier 《Structural equation modeling》2013,20(1):113-126
Two Lagrange multiplier (LM) methods may be used in specification searches for adding parameters to models: one based on univariate LM tests and respecification of the model (LM‐respecified method) and the other based on a partitioning of multivariate LM tests (LM‐incremental method). These methods may result in extraneous parameters being included in models due to either sampling error or the model being misspecified. A 2‐stage specification search may be used to reduce errors due to misspecification. In the 1st stage, parameters are added to models based on LM tests to maximize fit. Second, parameters added in the 1st stage are deleted if they are no longer necessary to maintain model fit. Illustrations are presented to demonstrate that errors due to misspecification occur with the LM‐respecified method and are even more likely with the LM‐incremental approach. These illustrations also show how the deletion stage can help eliminate some of these errors. 相似文献
16.
In this paper, a unified matrix recovery model was proposed for diverse corrupted matrices. Resulting from the separable structure of the proposed model, the convex optimization problem can be solved efficiently by adopting an inexact augmented Lagrange multiplier (IALM) method. Additionally, a random projection accelerated technique (IALM+RP) was adopted to improve the success rate. From the preliminary numerical comparisons, it was indicated that for the standard robust principal component analysis (PCA) problem, IALM+RP was at least two to six times faster than IALM with an insignificant reduction in accuracy; and for the outlier pursuit (OP) problem, IALM+RP was at least 6.9 times faster, even up to 8.3 times faster when the size of matrix was 2 000×2 000. 相似文献
17.
将Walther Janous—Shandun不等式转化为了条件不等式，利用Lagrange乘数法得到了一个较简捷的证明． 相似文献
18.
从拉格朗日乘数法入手，讨论一类二次型的条件极值问题，给出了主要结果，并应用它求解多元函数条件极值问题． 相似文献
19.
The dual formulation of the discrete-time mixedl
2/l
1 control design problem was achieved by using the duality theory of Lagrange multipliers. For some special dual mixedl
2/l
1 problems, an approximation method for the optimal value is introduced. A suboptimal value of the infinite-dimensional dual
problem can be obtained by solving a sequence of truncated problems. The convergence property of the solution scheme is investigated.
This paper gives a low approximation method for the primal problem.
Project(699085) supported by Zhejiang Provincial Natural Science Foundation of China. 相似文献
20.
张宋传 《福建工程学院学报》2016,(1):86-89
利用CR微分理论,提出求解一类线性等式约束的复变量非光滑凸优化问题的复值次梯度投影算法（CSPM）,该算法能完全基于复域上运行。在较弱的条件下证明了算法的全局收敛性,数值实验进一步表明了CSPM的可行性和有效性,该算法尤其适合大规模优化问题的求解。 相似文献