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针对视觉测量在轨道交通隧道大范围轮廓测量上的问题,研究设计一种大型多阵列圆标定板进行系统标定工作,提出区域生长重心法实现对标定图像上基准点的提取。即将区域生长法和灰度重心法相结合,通过粗定位寻找每个基准圆的种子点,考虑种子点像素的4邻域像素进行区域生长,然后利用灰度重心法提取生长区域的重心作为基准点。将非线性变化的基准点替代线性提取的基准圆的种子点,消除了图像畸变的影响,保证了特征检测过程的可靠性和鲁棒性,达到对于多阵列圆大型标定板基准点的提取。通过搭载鱼眼镜头拍摄6m的模拟隧道横断面轮廓,进行轮廓测量与还原。实验表明该方法提取的基准点像素坐标误差可达到2pixel以内,系统测量精度能够达到±5mm以内,完全满足轨道交通隧道横断面轮廓测量误差标准。 相似文献
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Closed kernel systems of the coalition matrix turn out to correspond to cones of games on which the core correspondence is
additive and on which the related barycentric solution is additive, stable and continuous. Different perfect cones corresponding
to closed kernel systems are described.
Received: December 2001/Revised: July 2002
RID="*"
ID="*" This note contains the new results, which were presented by the first author in an invited lecture at the XIV Italian
Meeting on Game Theory and Applications in Ischia, July 2001. The lecture was dedicated to Irinel Dragan on the occasion of
his seventieth birthday. 相似文献
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介绍了对化学取代基(R-基团)进行相似性比较的工作.每个R-基团主要依赖一些对反应影响较为明显,同时又便于计算的结构描述符来进行描述,例如电负性、氢键受体、氢键给体等参数.由于与反应核心相距过远的环境对反应的影响较小,R-基团相似性比较对象,就由每个R-基团截取从它与母体连接的位点出发向外扩展6层的子结构组成.在确立了对R-基团描述和距离限制的基础上,提出了用一个45维向量表示一个R-基团,并由化学结构的比较,转化为向量比较来实现R-基团相似性比较的方法.采用这一方法,成功地对大量的R-基团进行了相似性的区分,并实现了对未知化合物进行相似性预测的目标. 相似文献
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The discrete Wasserstein barycenter problem is a minimum-cost mass transport problem for a set of discrete probability measures. Although an exact barycenter is computable through linear programming, the underlying linear program can be extremely large. For worst-case input, a best known linear programming formulation is exponential in the number of variables, but has a low number of constraints, making it an interesting candidate for column generation.In this paper, we devise and study two column generation strategies: a natural one based on a simplified computation of reduced costs, and one through a Dantzig–Wolfe decomposition. For the latter, we produce efficiently solvable subproblems, namely, a pricing problem in the form of a classical transportation problem. The two strategies begin with an efficient computation of an initial feasible solution. While the structure of the constraints leads to the computation of the reduced costs of all remaining variables for setup, both approaches may outperform a computation using the full program in speed, and dramatically so in memory requirement. In our computational experiments, we exhibit that, depending on the input, either strategy can become a best choice. 相似文献
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Thomas Kaijser 《数学学报(英文版)》2011,27(3):441-476
Let S be a denumerable state space and let P be a transition probability matrix on S. If a denumerable set M of nonnegative matrices is such that the sum of the matrices is equal to P, then we call M a partition of P. 相似文献
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根据高功率准分子激光主振荡器功率放大系统像传递结构特点,利用LABVIEW与MATLAB相结合设计了靶面光斑重心的稳定性模拟仿真及分析软件。对光学元件稳定性测量结果和光学元件误差分配结果进行模拟仿真和验证,经过多次再分配实现了系统误差分配的最优化。数据表明,现有实验室条件下,靶面光斑重心稳定性尚不能满足要求;在保持低稳定性指标要求光学元件一定裕量前提下,高稳定性要求光学元件的最优化分配指标为1.7 μrad;实验室现有光学元件在工作条件下能够满足该优化分配指标,在一定程度上减小了对光学元件的结构要求。 相似文献
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本文在研究多因素数据重心法的基础上,进一步提出滑动数据重心预测方法,该方法是对原始样本数据提出了一种新的数据处理方法,大大降低了由于历史数据组中的异常点对预测结果产生的破坏性。通过建立我国钢材消费量与国内生产总值(GDP)的计量动态模型对该方法与多因素数据重心预测法进行对比研究。同时利用时间序列自回归AR(p)对计量动态模型的初级预测结果进行差值校正,并将该方法应用于我国2015年、2020年的钢材消费量预测。对比研究表明该方法使得预测结果更加精确、稳健。 相似文献