排序方式: 共有14条查询结果,搜索用时 21 毫秒
1.
2.
基于块匹配的运动对象检测算法 总被引:2,自引:2,他引:0
针对交通监控视频图像的特点,本文对传统的块匹配算法做出改进,提出了一种新的块匹配算法。算法的改进主要在两个方面:引进了零运动阚值;采用自顶向下逐步细化的搜索算法。仿真结果表明,提出的算法对图像的噪声适应性强.而且跟踪对象准确。 相似文献
3.
In this letter,an improved three-step search algorithm is presented,which uses both gray and chromatic information to boost the performance with random optimization and converge the motion vectors to global optima.Experimental results show that this algorithm can efficiently improve the PSNR after motion compensation. 相似文献
4.
《国际计算机数学杂志》2012,89(1):143-157
A three-step wavelet Galerkin method based on Taylor series expansion in time is proposed. The scheme is third-order accurate in time and O(2?jp ) accurate in space. Unlike Taylor–Galerkin methods, the present scheme does not contain any new higher-order derivatives which makes it suitable for solving non-linear problems. The compactly supported orthogonal wavelet bases D6 developed by Daubechies are used in the Galerkin scheme. The proposed scheme is tested with both parabolic and hyperbolic partial differential equations. The numerical results indicate the versatility and effectiveness of the proposed scheme. 相似文献
5.
6.
Hai-Feng Peng Yu-Guang Bai Kai Yang Xiao-Wei Gao 《Engineering Analysis with Boundary Elements》2013,37(11):1545-1555
In this paper, a three-step BEM analysis technique is proposed for solving 2D and 3D transient heat conduction problems consisting of multiple non-homogeneous media. The discretized boundary element formulation is written for each medium. The first step is to eliminate internal variables at the individual medium level; the second step is to eliminate boundary unknowns defined over nodes used only by the medium itself; and the third step is to establish the system of equations according to the continuity conditions of the temperature and heat flux at common interface nodes. Based on the central finite difference technique, an implicit time marching solution scheme is developed for solving the time-dependent system of equations. Three numerical examples are given to demonstrate the accuracy and effectiveness of the presented method. 相似文献
7.
8.
三步有限元的大涡模拟 总被引:1,自引:0,他引:1
采用三步有限元法求解不可压缩非定常流的N-S方程直接模拟后台阶流、平面流场中的旋涡运动及流场的压力分布特性,采用亚格子湍流模型,对雷诺数Re=5.5×105的流动做了计算分析。空间离散采用速度、压力同阶的三角形三节点单元。根据计算结果绘制了速度向量图,并对流场的压力分布进行了分析,分析表明,用该方法计算所得结果与有关资料吻合较好。该方法为大涡模拟在工程上的应用提供了一定的依据。 相似文献
9.
A new three-step fractionation scheme was applied to study the distribution of Al, As, Cd, Cr, Cu, Fe, Mn, Mo, Ni, Pb, S, Sb, Ti, V and Zn in fly ashes collected in the electrostatic precipitator of a thermal power plant in the city of San Nicolás (Argentina). Seven samples were collected during one week of operation in 2005. For the fractionation, the scheme applied consisted of extracting the elements in three fractions: (i) soluble and exchangeable elements, (ii) carbonates, oxides and reducible elements and (iii) residual elements. Metals and metalloids at μg g−1 level were determined in each fraction by plasma based techniques namely, inductively coupled plasma optical emission spectrometry (ICP OES) and inductively coupled plasma mass spectrometry (ICP-MS). For validation, a certified reference materials NIST SRM 2711 (Montana soil) was subject to the same chemical sequential extraction procedure. X-ray diffraction powder (XRD) analysis and scanning electron microscopy (SEM) were used to characterize the major minerals present in the matrix. The predominant phases found in the total samples were mullite, quartz, iron oxides and lime. Total analyte concentration varied (in μg g−1) from 1.54 for Cd to 30 600 for Al. The leachability of the 15 elements under study proved to be different. All the elements (except Cd and Pb) were detected in the soluble fraction in the order: Cu (0.10%) ∼ Mn (0.13%) < Ni (0.17%) ∼ Ti (0.19%) ∼ Fe (0.20%) ∼ As (0.21%) < Zn (0.86%) < Al (1.3%) < Cr (2.9%) < V (3.9%) < Sb (6.9%) < Mo (45.1%) < S (58.0%). Percentages higher than 20% of S (24.1%) < V (27.5%) < Mn (29.0%) were detected in the second fraction. Al, As, Cr, Cd, Cu, Fe, Ni, Pb, Sb and Zn were mostly associated to the residual fraction. Recoveries of the overall procedure varied between 106% (Mo) and 72% (Cr). 相似文献
10.
复分解法生产硝酸钾工艺研究 总被引:2,自引:2,他引:0
本文简述了复分解四步循环法与复分解三步循环法生产硝酸钾原理。通过理论与实践分析 ,确定了三步循环法生产硝酸钾的工艺条件 ,同时确证三步循环法是较好的生产工艺方法 相似文献