共查询到20条相似文献,搜索用时 78 毫秒
1.
采用棋盘格模板的摄像机标定新方法 总被引:2,自引:0,他引:2
在分析Opencv摄像机模型和现有的双目视觉系统标定方法的基础上,提出了一种新的标定算法.该算法包括3个步骤,首先利用最小二乘法求解图像的像面中心坐标,在不考虑畸变的情况下,选取中心处一小块作为摄像机标定的初始空间,采用线性优化方法求出除畸变系数以外的其他摄像机内外参数;然后将求得的参数作为初值,利用线性优化方法求解畸... 相似文献
2.
3.
4.
5.
在分析了摄像机模型,单双目视觉系统标定以及消隐点几何特性的基础上,提出了一种新型正交消隐点的摄像机标定方法。该方法仅使用摄像机在不同视角拍摄多幅(至少3幅)棋盘格模板的图像。引入一二阶径向畸变的摄像机针孔模型,主要由消隐点的计算与优化,消隐点法线性标定内部参数,新型改进的Tsai两步法线性求解外部参数和非线性全局优化等组成。实验结果表明,所给出的方法在全局优化之后,7幅图像的重投影平均像素误差为0.0043pixel,耗时为1.7911260s,可见速度快且精度高,可广泛应用于计算机视觉研究、工业三维测量与重构、道路测绘等多个领域的摄像机标定。 相似文献
6.
7.
为了直观反映双目视觉系统各参数标定误差对系统定位精度的影响,基于针孔摄像机成像模型和概率统计理论,运用蒙特卡罗法对轴线平行结构的系统定位误差进行仿真分析.针对视觉定位模型求解空间点表达式复杂的问题,为便于仿真,根据成像模型参数的相互独立性,提出了一种单参数分析定位误差的方法.利用该方法进行的仿真结果及其实验验证表明:内参数中,主点(u0,v0)的标定误差对系统X、Y方向定位精度影响大,焦距fu的标定误差对系统Z方向定位精度影响大;外参数中,旋转角β和基线t1对X、Y、Z3个方向定位精度的影响都较大.该结论对双目视觉系统设计及参数标定具有一定的参考价值. 相似文献
8.
基于双目视觉的直升机旋翼桨叶共锥度检测法 总被引:1,自引:0,他引:1
提出了一种基于双目视觉的直升机旋翼桨叶共锥度检测方法。首先,采用平面标定算法对双目视觉系统进行标定,获取摄像机内外参数;其次,采集不同桨叶的立体图像对,并用Bouguet算法对其进行校正,获取重投影矩阵;然后,对立体图像对中的标记点进行检测与匹配,获取标记点的视差;最后,根据双目视觉测量原理计算出桨尖距地面的高度,实现桨叶共锥度检测。通过对旋翼塔进行多次测量实验,结果表明该方法具有动态测量、非接触式、操作简单、危险性小和精度高的优点。 相似文献
9.
10.
11.
Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
12.
Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
14.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
15.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
16.
Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
17.
Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
18.
A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
19.
《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献
20.
《中国通信》2014,(8)
正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first 相似文献