共查询到19条相似文献,搜索用时 154 毫秒
1.
2.
3.
为提高标定精度,提出一种基于直线空间变换的光平面标定方法。首先利用互相关模板与5点滑动平均法提取激光条纹中心,然后采用正交回归法拟合图像中的光条直线方程。通过平面单应性变换获得靶标面光条直线方程,进一步再将靶标坐标系中的直线方程转换成Plücker矩阵形式。根据位姿转换关系得到相机坐标系下的直线方程,并建立超静定线面共面约束方程组,使用奇异值分解(SVD)求解光平面方程参数。所提方法测量的标准台阶块长度方均根(RMS)为0.065mm,平均误差小于0.030mm,圆柱直径的测量平均误差与RMS小于0.050mm。结果表明,利用光条自身整体信息拟合光平面,所提方法可实现较高的标定精度且标定过程简单,同时避免对每个特征点进行单独求解。 相似文献
4.
一种基于Hough变换的新直线段检测算法 总被引:2,自引:1,他引:1
为了获得图像中直线段的端点及长度信息,提出一种逆向Hough变换检测算法,由一个已知点和直线的斜率构造直线的方程,然后检测满足直线方程的点的个数.同时,为了克服Hough变换计算量大的弊端,引入直线梯度方向信息,避免重复的直线提取.实验证明,该方法较传统的Hough变换,可以很好地得到直线段的端点,并且算法快速简单. 相似文献
5.
由FFT芯片构成的并行FFT结构 总被引:1,自引:0,他引:1
快速傅立叶变换(FFT)在计算机层析影象技术,语间识别,图像处理等域得了广泛的应用。随着计算机应用的发展,越来越需要对大规模的数据进行变换。并行FFT是完成快速数据变换的一种方法。本文提出一咱由小规模FFT芯片构成并行FFT的方法,楞用于大规模数据的变换,并对其并行结构的面积和执行时间进行了探讨,还提出了具有容错功能的并行FFT网络。 相似文献
6.
快速傅里叶变换(FFT)用于某些科学和信号处理应用中计算离散傅里叶变换。此变换历来用C语言执行。然而,假若速度是一个极端关键问题,则也可考虑用汇编语言执行此变换。下面就是这样的例子:分解为实数和虚数部分(BUFFER-REALANDBUFFER_IMAGE)的一系列离散点是程序的自变量,用来计算FFT并把结果存储在它们对应的实数和虚数部分中(RESULT_REALandRESULT_IM_AGE)。程序工作首先计算所需要的幂,然后通过内和外循环的一组嵌套来计算变换。此外,已知FFT具有倒数性质,… 相似文献
7.
8.
一种基于Zernike矩的直线提取算法 总被引:5,自引:1,他引:4
提出了一种新颖的基于Zernike矩(ZMs)的直线提取算法。该算法首先是利用ZMs在局部坐标系中计算边缘点所在直线方程,然后通过坐标变换将直线方程变换到图像坐标系中,从而建立了边缘点和所在直线参数之间的一一映射关系,最后对于所求出的直线参数在参数空间对参数单元投票取阈值提取直线。实验表明,该算法速度快、精度高和抗干扰性强。 相似文献
9.
10.
11.
ANALYSIS OF OPEN MICROSTRIP STRUCTURES BY USING DIAKOPTIC METHOD OF LINES COMBINED WITH PERIODIC BOUNDARY CONDITIONS 总被引:1,自引:0,他引:1
Zhu Hanqing Fang Dagang Long Yi 《电子科学学刊(英文版)》1998,15(1):90-96
This paper presents the analysis of open microstrip structures by using diakoptic method of lines (ML) combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch current excited by plane wave. Impedance matrix elements are computed by using fast Fourier transform(FFT), and reduced equation is solved by using diakoptic technique. Consequently, the computing time is reduced significantly. The convergence property of simulating open structure by using PBC and the comparison of the computer time between using PBC and usual absorbing boundary condition (ABC) show the validity of the method proposed in this paper. Finally, the resonant frequency of a microstrip patch is computed. The numerical results obtained are in good agreement with those published. 相似文献
12.
13.
计算SDFT的一种新算法 总被引:1,自引:0,他引:1
基于按时间抽取的基2FFT算法,本文提出一种计算SDFT的快速算法。该算法可直接利用现有的FFT处理系统,只需更改W系数值,即可得到所需的SDFT值.与已有的算法相比,节省计算量大约20%~50%,该算法可用于SDFT多种应用中。 相似文献
14.
15.
A new 2-D FFT algorithm is described. This algorithm applies a 2-D matrix factorization technique in a 2-D space and offers a way to do 2-D FFT in both dimensions simultaneously. The computation is greatly reduced compared to traditional algorithms. This will improve the realization of a 2-D FFT on any kind of computer. However its good parallelism will especially benefit an implementation on a computer with hypercube architecture. A good arrangement of parallel processors will save a great deal of running time. Furthermore this algorithm can be extended toM-D cases forM>2.Supported by NSF Grant CCR-8813493.Supported by Grants DMS-8607687, DMS-8722402, and DMS9002019. 相似文献
16.
Wen Geyi 《Microwave Theory and Techniques》1990,38(8):1086-1091
A polygon discretization technique for establishing a network model suitable for both TEM (transverse electromagnetic) transmission lines and hollow waveguides is introduced. A network model decomposition algorithm, or diakoptic algorithm, is also presented for solving the transmission-line problems and is shown to be useful when a computer is not sufficiently large to accommodate a problem. The network model decomposition algorithm can be used to calculate the characteristic impedance of an arbitrarily shaped TEM transmission line and the cutoff wavenumbers of a hollow waveguide of arbitrary section. Numerical results are also presented as a demonstration of the method's validity 相似文献
17.
A hybrid approach, combining the method of lines (MoL) and transverse resonance technique (TRT), is presented for the analysis of microstrip step discontinuities that are printed on uniaxial or biaxial bi-anisotropic substrates. The method of lines, formulated in terms of Kronecker products, is used to determine the characteristic equation for the resonant length. The transverse resonance technique is applied to obtain the S-parameters of the junction by casting the discontinuity problem as a microwave equivalent network. Good agreement is found between results of the MoL/TRT approach and those obtained by other methods. Effects of individual tensor elements of the substrate on the scattering parameters of the discontinuity are investigated at selected frequencies. The proposed MoL/TRT approach is found to converge very fast and does not require excessive computer memory, with all computations performed on a 486DX-50 MHz PC 相似文献
18.
Sun Baohua Ji Yicai Liu Qizhong 《电子科学学刊(英文版)》2002,19(1):84-88
A new hybrid technique is presented, which combines the Mode Matching(MM) method with the Method of Lines (MoL) to analyze a coaxial fed monopole antenna.The monopole antenna is dealt with using the MoL, while the MM method is used to analyze the coaxial feed system.Then, the two sub-problems are combined by enforcing point matching at the common regional interfaces.The input impedance is computed and compared with the measured data reported in literature, and the excellent agreement is observed. 相似文献